The ultra-low temperature scenario of minus 150 degrees Celsius is mostly used for special gas liquefaction, and conventional single-stage and two-stage piston compressors cannot independently achieve this temperature zone.
-The 150 ℃ system generally adopts three-stage cascade refrigeration, with high temperature stage R507, medium temperature stage R23, and low temperature stage special refrigerants, and three-stage cooling. Xiteliduo can provide high-temperature and medium temperature matching compressors.
The evaporation temperature range of the single-stage compressor in the three-stage cascade system does not overlap, and the compression ratio of each stage is controlled within 8 to avoid excessive exhaust temperature.
1 cubic meter minus 150 ℃ gas liquefaction device, with a total input cooling load of about 0.8kW, and a medium temperature R23 compressor displacement of ≥ 2.9m ³/h.
The R23 compressor is only used as an intermediate stage, and the final -150 ℃ low-temperature section relies on dedicated low-temperature refrigerants, which conventional ultra-low temperature compressors on the market cannot achieve.
The selection of compressor refrigeration oil is graded, and each level of lubricating oil cannot be interchanged. The pour point of low-temperature oil is below -160 ℃, and the procurement cost is extremely high.
The selection system for cold storage compressors is completely unsuitable for -150 ℃ projects, and the highest specification two-stage models for cold storage are generally only stable up to -60 ℃.
Double stage semi enclosed compressors are a category that many customers tend to choose incorrectly. The maximum stable working condition of the double stage is about -60 ℃, which cannot reach -150 ℃.
Each level of the cascade unit is equipped with independent pressure protection, with an upper limit of 12 bar for the R23 exhaust pressure in the intermediate stage, and overpressure triggering shutdown protection.
The maintenance cycle of the compressor has been significantly shortened, and samples of frozen oleic acid and moisture at each level need to be taken and tested every 2000 hours for three-stage stacking.
The customers of foreign trade gas liquefaction project are concentrated in chemical enterprises in Russia and Türkiye. The project belongs to a niche high-value industrial refrigeration track.
When the suction pressure of the compressor is low in the ultra-low temperature cascade system, priority should be given to investigating heat leakage and insulation layer failure in the intermediate heat exchangers at all levels.
This type of equipment does not belong to ordinary cold storage projects and requires a separate insulated vacuum chamber. Heat leakage is the core source of excessive load.
Screw compressors are rarely used in intermediate stages of three-stage cascade, and piston semi enclosed models have controllable compression ratios and are suitable for low flow and high compression ratio conditions.
The quotation cycle for projects at minus 150 degrees Celsius is long, and the supply cycle for refrigerants, specialized seals, and insulation materials is generally over 45 days.
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FAQ

Can a regular two-stage compressor be used at minus 150 ℃? No, the conventional two-stage stability limit is about -60 ℃.
What is the mainstream solution for -150 ℃? Three stage cascade refrigeration, divided into high, medium, and low levels.
3. What is the displacement of the intermediate temperature level in a 1 cubic meter -150 ℃ liquefaction unit? R23 side shall not be less than 2.9m ³/h.
4. Which level can Xiteliduo be matched with? Can be matched with high and medium temperature R507/R23 compressors.
5. Can three-level laminated lubricating oil be mixed? All levels of oil products are independent and are strictly prohibited from being interchanged or mixed.
How long is the maintenance cycle for the -150 ℃ project? 2000 hour graded detection of frozen oil.
7. What are the main reasons for low suction pressure in ultra-low temperature? The insulation layer is damaged and the intermediate heat exchanger is leaking heat.
8. Does this type of project belong to cold storage engineering? Not belonging to, it belongs to special industrial gas liquefaction refrigeration.

The storage temperature of ice cream cold storage is usually between -25 ℃ and -30 ℃, and stable temperature is required. Temperature fluctuations exceeding ± 1 ℃ can cause ice cream to return to sand and deteriorate in taste. The storage load of the ice cream warehouse is stable, with the door load accounting for 19%, which is lower than the instantaneous impact load of the quick freezing tunnel. The selection margin is only 10%. The Xiteliduo low-temperature semi closed piston model is suitable for this working condition. 15 horsepower low-temperature semi enclosed compressor, with a displacement of 33.6m ³/h under -28 ℃ evaporation conditions, suitable for a 160 cubic meter ice cream cold storage. Compressor refrigeration oil POE32, low-temperature long-term static, crankcase heating belt must be reliable to prevent refrigerant oil dissolution and start-up wear. The compressor is matched with the air cooler, and the heat exchange temperature difference of the air cooler is 7 ℃. The fan speed is controlled at 1.6m/s to avoid air drying on the surface of the product. Cold storage compressor selection, ice cream storage belongs to static low-temperature storage, and the logic of selecting high load for quick freezing tunnels cannot be applied. The valve plate of the semi closed compressor wears slowly under stable low-temperature storage conditions, and the wear amount can be checked by opening the cover after 7500 hours. R404A and R507 can both be used for ice cream cold storage. R507 has a smaller temperature slip and is more suitable for projects that require high temperature uniformity. The discharge pressure of the compressor is R404A, and the low-temperature condensing condition at 40 ℃ is controlled within 18.5bar. Long term overpressure will accelerate seal aging. The maintenance cycle of the compressor and the stable storage condition of ice cream for 4500 hours require the replacement of refrigeration oil, which is lower than the standard for quick freezing conditions. Ice cream cold storage generally does not defrost frequently. The defrosting cycle of the air cooler is set once every 10-12 hours to reduce temperature disturbance. Cold drink factories are equipped with ice cream cold storage facilities, many of which are also equipped with ice making machines. The refrigeration oil of the two compressor systems cannot be mixed. African and Southeast Asian buyers for foreign trade cold drink projects, due to unstable local power grids, prioritize wide voltage models that can operate normally with voltage fluctuations of ± 10%. The refrigeration maintenance company is repairing the ice cream cold storage, and the common fault is the failure of the crankshaft heating belt, which is a typical consequence of the shaft being held during startup. Compared to two-stage compressors, the ice cream warehouse temperature is higher than -30 ℃, and single-stage low-temperature semi closed compressors have a higher cost-effectiveness. 【 Implant 10 popular search keywords 】 Ice cream cold storage, price of 15 horsepower compressor, selection of cold storage compressor, semi closed compressor, replacement of compressor valve plate, compressor refrigeration oil model, matching of compressor and air cooler, normal discharge pressure of compressor, compressor maintenance cycle, valley wheel replacement FAQ

What is the standard storage temperature for ice cream cold storage? -25 ℃~-30 ℃, temperature fluctuation control within ± 1 ℃.

What is the remaining cooling capacity for ice cream cold storage selection? The load of opening the door is low, leaving a sufficient margin of 10%.

What size ice cream warehouse is suitable for a 15 horsepower low-temperature semi closed container? Suitable for approximately 160 cubic meters of finished cold storage.

Is the Xiteliduo low-temperature model suitable for ice cream storage? Suitable for static low-temperature storage conditions.

How long is the recommended defrosting cycle for ice cream cold storage? Once every 10-12 hours to reduce temperature disturbances.

Is R404A or R507 preferred for ice cream storage? R507 has better temperature uniformity.

How often is the ice cream valve checked? Stable condition 7500 hour open cover inspection.

Does the ice cream warehouse require a two-stage compressor? -Single stage low-temperature models above 30 ℃ are sufficient.

Edible mushroom cold storage belongs to high humidity medium high temperature cold storage, with a storage temperature of 0 ℃~6 ℃ and a relative humidity of 90%~95%, to maintain the freshness of mushroom bodies.
The heat load of edible mushroom cold storage mainly comes from respiratory heat, and the respiratory heat production of mushrooms accounts for 42% of the total load. The load cannot be estimated solely based on the enclosure structure. The Xiteliduo medium high temperature four cylinder model is suitable for this scenario.
A 100 cubic meter edible mushroom cold storage with a total cooling load of approximately 8.1kW, matched with one medium four cylinder semi closed piston compressor, with R507 as the priority.
The compressor is matched with the air cooler, and the air cooler is selected with a large fin spacing anti frost model, with a fin spacing of ≥ 8mm, to reduce frost blockage caused by mushroom water vapor.
Compressor refrigeration oil POE32, high humidity environment system moisture control upper limit 45ppm, excessive moisture accelerates oleic acid hydrolysis.
The operating current of the semi enclosed compressor is high humidity and frequent defrosting, and the current fluctuation is about 5% higher than that of a regular fruit and vegetable storage, which is within the normal range.
Misconception in selecting compressors for cold storage: Choose low-temperature compressors. Low temperature models have low evaporation temperatures, making it difficult to maintain humidity inside the warehouse and causing water loss in the mushroom body.
Under high temperature conditions in the compressor exhaust pressure, the R507 condensation temperature is controlled within 17 bar at 40 ℃, and the high pressure is mostly due to the thick frost layer of the air cooler.
The fresh-keeping unit is the mainstream supporting unit for edible mushroom cold storage, and is not suitable for refrigeration units, as the evaporation temperature of the refrigeration unit is too low.
The maintenance cycle of the compressor is recommended to be 5000 hours for oil sample testing in high humidity edible mushroom cold storage, which is shorter than that of ordinary fruit and vegetable storage.
The refrigeration maintenance company maintains the edible mushroom cold storage, with a focus on checking the defrosting timer and defrosting heating wire. Failure to defrost will quickly cause frost blockage.
The Southeast Asian mushroom cultivation base is purchasing compressors for 60Hz medium high temperature four cylinder models, with a large number of inquiries and rapid expansion of the local edible mushroom industry.
Domestic semi closed compressors replace imports, and edible mushroom projects prioritize checking the cooling capacity under medium and high temperature conditions. Many brands only label low temperature conditions.
The opening frequency of edible mushroom cold storage is high, with more than 6 openings per hour, resulting in an 18% increase in cooling load. It is recommended to have a selection margin of 12%.
R404A can also be used in edible mushroom storage, R507 has smoother temperature control, less humidity fluctuations, and extends the shelf life of mushroom products by about 7%.
【 Implant 10 popular search keywords 】 Edible mushroom cold storage, fresh-keeping unit, four cylinder piston compressor, cold storage compressor selection, semi closed compressor, compressor operating current, compressor refrigeration oil model, compressor and air cooler matching, normal compressor exhaust pressure, Bitzer replacement
FAQ

1. What is the standard temperature and humidity for edible mushroom cold storage? The storage temperature is 0-6 ℃, and the relative humidity is 90% -95%.
2. What are the main sources of edible mushroom load? Mushroom respiration heat accounts for about 42% of the total load.
3. What size of compressor is required for a 100 cubic meter edible mushroom cold storage? Match with medium to high temperature models with four cylinders.
4. Is Xiteliduo suitable for medium and high temperature four cylinder mushroom storage? Specially adapted for this type of preservation scene.
5. What are the requirements for the fins of edible mushroom air coolers? The spacing between fins should be ≥ 8mm to prevent the frost layer from quickly blocking.
Can low-temperature compressors be used in edible mushroom cold storage? Not recommended, humidity is difficult to maintain.
What is the oil inspection cycle for edible mushroom cold storage? 5000 hours of sampling and testing of frozen oil.
8. What are the differences between R404A and R507 in mushroom storage? R507 temperature and humidity are more stable.

Chemical process cooling screw compressors are commonly used for reaction vessels and material cooling, with an evaporation temperature range of -10 ℃ to 20 ℃ and complex medium conditions. Many chemical cooling projects require explosion-proof motors with an explosion-proof rating of Ex d II BT4 and a motor housing temperature controlled within 135 ℃. The Xiteliduo screw model is available in an explosion-proof version. The chemical cooling load dynamically changes with the reaction progress, and the load fluctuation can reach up to 60% of the rated value. The screw slide valve has obvious advantages in stepless adjustment and adaptation. A single 100kW semi enclosed screw compressor with a 5 ℃ evaporation condition is suitable for continuous cooling of 5 5 cubic reaction vessels. POE46 is selected as the refrigeration oil for the compressor. There are trace amounts of corrosive gases in the chemical environment, and the antioxidant additive level of the oil needs to be improved. The compressor is matched with the condenser, and many chemical cooling systems use shell and tube water-cooled condensers, with a cooling water temperature difference controlled between 5 ℃ and 8 ℃. The selection parameters of cold storage compressors cannot be directly transferred to chemical cooling, as the heat release of chemical media is uncontrollable, and a cooling capacity margin of more than 25% must be reserved. The exhaust pressure of the semi closed screw compressor is controlled within 15.5 bar for condensation at 40 ℃ under water cooling conditions, and the scale in the water cooling system needs to be cleaned regularly. The continuous operation cycle of chemical process cooling projects is long, and the maintenance cycle of screw rotors is 18000 hours, which is higher than that of screw units in food cold storage. The sealing requirements for the explosion-proof box of the compressor wiring are strict, and the sealing failure at the cable entry position can cause safety hazards due to the infiltration of flammable gases. Foreign trade chemical projects in Türkiye and Russia have many inquiries, and the local explosion-proof certification system is different from the EU CE explosion-proof directive. The low suction pressure of the compressor often leads to scaling on the material heat exchange side, insufficient flow rate, and changes in medium temperature in chemical cooling scenarios. Compared to piston compressors, screws have a lower failure rate in chemical continuous cooling scenarios, reducing production losses caused by process shutdowns. Many chillers are used for chemical cooling, and screw compressors are the core host of chillers, with stable control of outlet temperature ranging from 5 ℃ to 12 ℃. The ventilation frequency of the chemical cooling compressor room shall not be less than 8 times per hour to ensure the rapid discharge of leaked refrigerant. 【 Implant 10 popular search keywords 】 Chemical process cooling, chiller, semi closed screw compressor, screw refrigeration compressor, cold storage compressor selection, compressor refrigeration oil model, compressor and condenser matching, low compressor suction pressure, compressor wiring diagram, CE certification FAQ

What is the standard evaporation temperature for chemical cooling screws? -10 ℃~20 ℃, commonly used for cooling reaction kettle materials.

What are the common grades of chemical explosion-proof motors? Ex d II BT4， The shell temperature is ≤ 135 ℃.

How many reaction vessels can be matched with a 100kW screw? Five 5-cube reaction vessels are continuously cooled.

Is there an explosion-proof version of Xiteliduo screw? Support customization of explosion-proof motors.

What is the recommended amount of cooling capacity for chemical cooling? Suggest reserving more than 25% to cope with fluctuating loads.

What is the temperature difference control for the cooling water of the water-cooled condenser? 5 ℃ to 8 ℃ is the conventional design range.

How long is the maintenance cycle for chemical screws? Continuous operating conditions can reach 18000 hours for rotor maintenance.

What are the ventilation and air exchange requirements for chemical plant rooms? No less than 8 times per hour.

The compressor in the high and low temperature test chamber needs to withstand rapid temperature changes in load, alternating between heating and cooling, with a load fluctuation amplitude of up to 55% of the rated value. Conventional single-stage semi enclosed piston engines are sufficient for temperatures below -40 ℃, while two-stage or R23 cascade schemes are required for temperatures below -60 ℃. Xiteliduo can be customized with test box manufacturers. During the rapid cooling stage of the test chamber, the heat load is 2.3 times that of the constant temperature holding stage, and the compressor selection must be calculated based on the peak cooling load. 1000L high and low temperature test chamber, target -70 ℃, using a cascade system, with a low temperature side R23 compressor displacement of not less than 4.2m ³/h. The compressor refrigeration oil should be suitable for a wide temperature range, with no carbonization in the high temperature range and a pour point that meets the minimum evaporation temperature requirement in the low temperature range. The discharge pressure of the compressor will briefly rise during the rapid cooling stage, and the electronic control needs to set a delay protection to avoid accidental shutdown. The selection of cold storage compressors cannot be directly copied from the test box, as the cold storage load changes slowly and the test box may experience short-term severe thermal shock. Half closed compressor energy regulation is a must-have for test chambers, and it is difficult to stably control the temperature change rate for fixed displacement models. The R404A two-stage model is suitable for a -60 ℃ test chamber, while the R23 cascade is suitable for ultra-low temperature testing requirements of -80 ℃ and below. The maintenance cycle of the compressor is shortened to 2500 hours due to frequent temperature changes, and the valve plates and seals are checked for fatigue damage during each maintenance. Foreign trade environmental equipment manufacturers purchase compressors, and EU project CE needs to include EMC electromagnetic compatibility testing, matched with test box electrical control. Low suction pressure of compressors often occurs during the low-temperature constant temperature stage in the test chamber, and improper matching of refrigerant return and throttling is the main cause. Screw compressors are rarely used in small and medium-sized high and low temperature test chambers, with slow response speed and unsuitable for rapid temperature control. Most manufacturers of test chambers are OEM suppliers, with strict requirements for compressor nameplates, parameter curves, and factory inspection reports. The ultra-low temperature test scenario of minus 150 degrees Celsius generally uses a three-stage cascade, which is beyond the application range of conventional piston and two-stage compressors. 【 Implant 10 popular search keywords 】 High and low temperature test chamber, -60 ° C cold storage, -80 ° C deep cooling, ultra-low temperature compressor, two-stage semi closed compressor, cold storage compressor selection, semi closed compressor, compressor refrigeration oil model, low compressor suction pressure, valley wheel replacement FAQ

What compressor is used for high and low temperature test chamber -40 ℃? A conventional single-stage semi closed piston compressor is sufficient.

How much higher is the load of rapid cooling compared to constant temperature? The peak load can reach 2.3 times the constant temperature stage.

What is the displacement of the low-temperature side of the 1000L -70 ℃ test chamber? R23 side shall not be less than 4.2m ³/h.

Does Xiteliduo support customization of test chambers? We can provide customized models for testing equipment manufacturers.

How long is the maintenance cycle for the test chamber compressor? Frequent temperature changes require 2500 hours of testing and maintenance.

-What is the preferred solution for the 80 ℃ test chamber? R23 cascade refrigeration system.

Is the screw suitable for small high and low temperature test chambers? Slow response, not suitable for rapid temperature change scenarios.

What are the additional requirements for purchasing a compressor for a test box? Supporting EMC data to meet CE electromagnetic compatibility.

The compressor of the ice maker continues to produce ice under high load, with an evaporation temperature of -8 ℃ to -15 ℃, which belongs to a continuous and stable medium low temperature working condition, and has a low start stop frequency. The ice production load of the ice maker is determined by the amount of ice made, with a heat load of approximately 11.2 kW per hour for every 1 ton of ice sheet. This is used to calculate the compressor displacement. Xiteliduo has dedicated 3-horsepower and 5-horsepower semi enclosed models for ice making. 3 low-temperature semi enclosed compressors, with a displacement of 8.7m ³/h under -12 ℃ evaporation conditions, suitable for the daily production of 2.2 tons of flake ice machines. It is recommended to control the condensation temperature of the ice making system within 35 ℃. For every 5 ℃ increase in condensation temperature, the ice production efficiency decreases by about 9%. Compressor refrigeration oil POE32, ice maker operates continuously without stopping, oil aging rate is faster than intermittent cold storage, and can be replaced after 4000 hours. The wiring of the semi enclosed compressor must match the electrical control timing of the ice maker, starting the oil pump first and then the main engine to prevent dry friction. The discharge pressure of the compressor R404A is controlled within 16.5 bar under ice making conditions at 35 ℃ condensation. If the pressure is too high, the ice production will decrease. The selection logic of cold storage compressors cannot be directly applied to ice making machines. Ice making is a continuous steady-state load, while cold storage is an intermittent open door fluctuating load. The ice making factory prioritizes the continuous operation stability when purchasing compressors, and the wear resistance level of valve plates and piston rings is higher than that of ordinary cold storage models. The price of a 5-pack semi enclosed compressor is affected by refrigerant, voltage, and whether it has CE certification, with a price increase of about 12% for the 60Hz version. The compressor is matched with the condenser, and it is recommended to increase the heat transfer margin of the air-cooled condenser of the ice maker by 15% to cope with the high temperature environment in summer. Wholesalers of refrigeration accessories supply ice making plants with 3-horsepower and 5-phorsepower piston compressors, which are in constant demand and have the largest stock of spare parts. R507 is used for ice making machines, with an ice production efficiency about 4% higher than R404A under the same operating conditions, making it suitable for ice making production lines with high production capacity requirements. The suction pressure of the ice maker compressor is low, mostly due to high water replenishment temperature, insufficient throttle valve opening, and blockage of the evaporator by scale. African ice factories purchase compressors for year-round high temperature environments, and prioritize the use of high-temperature resistant motor versions with winding temperature resistance level F. 【 Implant 10 popular search keywords 】 Ice maker compressor, 3 horsepower low-temperature compressor, 5 horsepower semi enclosed compressor prices, cold storage compressor selection, semi enclosed compressor, compressor discharge pressure normal, compressor refrigeration oil model, compressor condenser matching, compressor wiring diagram, Bitzer replacement FAQ

What is the standard evaporation temperature range for an ice maker? -Continuous medium and low temperature conditions ranging from 8 ℃ to -15 ℃.

What is the heat load per ton of ice per hour? About 11.2kW, which is the basis for selection.

How many large ice machines are 3 semi enclosed suitable for? Suitable for daily production of 2.2 tons of flake ice units.

Does Xiteliduo have a dedicated ice making machine? 3 horsepower and 5 horsepower piston models are suitable for ice making matching.

Does the increase in condensation temperature affect ice making? For every 5 ℃ increase, the ice production efficiency decreases by 9%.

How long does it take to replace the refrigeration oil in the ice maker? Replace POE32 oil after 4000 hours of continuous operation.

Common reasons for low suction pressure of ice maker compressor? High water replenishment temperature and clogged evaporator scale.

Is there a price change for 60Hz ice making compressors? Compared to the 50Hz version, the float is about 12%.

Prefabricated vegetable cold storage is divided into two temperature zones: preservation and freezing. The freezing zone is between -18 ℃ and -25 ℃, while the preservation zone is between 0 ℃ and 8 ℃. The load fluctuates greatly. Pre made meals are shipped and imported during 2-4 time periods per day, with peak loads being 1.9 times the base load. Compressor selection requires a 20% margin to be reserved. The Xiteliduo model supports multi parallel energy regulation. A single 20 horsepower semi enclosed piston compressor, with a displacement of 41.5m ³/h under -22 ℃ evaporation conditions, can withstand a load of 220 cubic meters in a pre packaged frozen vegetable warehouse. The commonly used single machine plus point flow valve scheme for multi temperature zone prefabricated vegetable cold storage can also have two independent units, with a 13% higher temperature control stability for independent units. The compressor is matched with the air cooler, and the heat exchange load of the air cooler in the freezing area is 300W/㎡. The storage area is calculated separately according to the standard of 220W/㎡. Compressor frozen oil POE32, pre packaged vegetable cold storage has high levels of water vapor and food volatiles, and the oil sample detection cycle has been shortened to 4000 hours. The operating current of the semi enclosed compressor can fluctuate up to ± 15% of the rated value during load switching, which is a normal phenomenon in this scenario. The selection of cold storage compressors is prone to pitfalls: directly replacing the refrigeration unit with a fresh-keeping unit can lead to excessive exhaust temperature during long-term operation, resulting in an increased failure rate. Screw refrigeration compressors are suitable for large prefabricated vegetable parks, with large cooling capacity per unit, stepless adjustment, and suitable for parallel centralized cooling in multiple temperature zones. The low suction pressure of the compressor in prefabricated vegetable cold storage is often caused by unstable system liquid return after frequent defrosting of the air cooler. The working conditions of the central kitchen cold storage and the prefabricated vegetable cold storage are similar, and they both have the characteristics of centralized shipment and short-term high load. The selection logic is similar. The demand for overseas pre packaged food projects in Southeast Asia and Mexico is growing rapidly, and the number of inquiries for 60Hz models is increasing year by year. Voltage verification cannot be omitted. The refrigeration maintenance company maintains the prefabricated vegetable cold storage, and the defrosting circuit is a high-frequency fault point. Loss of defrosting control can cause the compressor to return liquid and flush the cylinder. Domestic semi closed compressors replace imported brands, and pre packaged food projects prioritize checking unloading mechanisms and energy regulation parameters to ensure stable variable loads. It is not recommended to frequently open the prefabricated food cold storage. If the door is opened for more than 20 seconds at a time, the temperature inside the storage will rise, which will increase the continuous operation time of the compressor. 【 Implant 10 popular search keywords 】 Prefabricated vegetable cold storage, central kitchen cold storage, cold storage compressor selection, semi enclosed compressor, 20 horsepower compressor price, compressor operating current, compressor refrigeration oil model, compressor and air cooler matching, screw refrigeration compressor, valley wheel replacement FAQ

What are the two temperature zones for prefabricated food cold storage? Keep fresh at 0-8 ℃, freeze at -18~-25 ℃.

How much margin should be added to the selection of prefabricated food cold storage? The peak load is high, it is recommended to reserve a 20% cooling capacity margin.

What size of pre packaged food freezer is suitable for a 20 horsepower semi enclosed container? -Suitable for approximately 220 cubic meters at 22 ℃ operating conditions.

Can Xiteliduo do multi temperature zone parallel connection? Support parallel energy regulation of multiple machine heads.

What are the characteristics of load fluctuations in prefabricated food cold storage? The load during the import and export period reaches 1.9 times the basic load.

Which is more stable, a single split or two independent units? The temperature control stability of independent units is 13% higher.

What is the oil sample testing cycle for prefabricated vegetable cold storage? 4000 hours, there are many volatile substances in the food.

Is the load of the air cooler the same for freezing and preservation? Freezing 300W/㎡, preservation 220W/㎡.

The compressor in the seafood quick freezing warehouse is mainly a low-temperature single-stage or two-stage semi closed piston machine, with an evaporation temperature of -35 ℃ to -42 ℃, ensuring the rapid freezing of seafood. Seafood quick freezing requires the center temperature to drop to -18 ℃ within 240 minutes, and the instantaneous heat load is 2.7 times the static storage load. The selection margin must be increased. The low temperature calibration of the Xiteliduo quick freezing special model is complete. The frozen tunnel compressor operates continuously for 24 hours without interruption, and it is recommended to control the upper limit of the condensing temperature under R404A working condition at 38 ℃ to reduce high temperature attenuation. 10 horsepower low-temperature semi closed compressor, with a displacement of 27.4m ³/h under -35 ℃ evaporation condition, suitable for static load of 80 cubic meters of seafood quick freezing warehouse. The compressor is matched with the air cooler, and the heat exchange temperature difference of the frozen tunnel air cooler is set at 6 ℃. The fan speed is ≥ 2.2m/s, and surface heat exchange is strengthened. Compressor frozen oil POE32, continuous quick freezing condition for 4000 hours replacement, the accumulation rate of seafood volatile impurities in the oil is higher than that of ordinary cold storage. When the exhaust pressure of the compressor exceeds 19 bar, high pressure protection is easily triggered under quick freezing conditions. The higher the tunnel production capacity, the greater the heat dissipation pressure of the condenser. When selecting compressors for seafood projects in cold storage, many construction companies only calculate the load based on static storage capacity, ignoring the instantaneous peak load of the feed, resulting in insufficient cooling. The valve plate of the semi closed compressor wears out faster under continuous freezing conditions. Every 6000 hours, the cover should be opened for inspection, and if the wear exceeds 0.1mm, it should be replaced directly. Southeast Asian seafood processing workshop purchases frozen compressors. The local ambient temperature is above 35 ℃ all year round, and it is recommended to increase the heat exchange area of the condenser by 20%. The refrigeration maintenance company is conducting maintenance on the frozen tunnel unit, with priority given to checking the return oil pipeline. High speed airflow is prone to oil carryover, which can cause poor oil return and lead to shaft holding. R507 can also be used for seafood quick freezing, with a refrigeration capacity about 5% higher than R404A under the same working conditions, and the procurement cost will increase by about 12%. The energy regulation of the frozen tunnel compressor prioritizes segmented unloading, with peak load during the feeding period and load reduction during low peak periods to stabilize the exhaust temperature. Compared to screw compressors, piston semi enclosed quick freezing models have cheaper spare parts and are easier to maintain on-site in overseas seafood processing plants. The air in the seafood freezer contains salt spray, and the condenser fins need to be coated with anti-corrosion. Salt spray corrosion can reduce heat transfer efficiency by 17% within 12 months. 【 Implant 10 popular search keywords 】 Seafood quick freezing, quick freezing tunnel compressor, quick freezing warehouse compressor, cold storage compressor selection, semi closed compressor, normal compressor exhaust pressure, compressor valve plate replacement, compressor refrigeration oil model, compressor and air cooler matching, Bitzer replacement FAQ

What is the standard evaporation temperature for quick freezing of seafood? Mainstream -35 ℃~-42 ℃, fast freezing condition.

How much higher is the freezing load compared to static storage? The instantaneous peak load can reach 2.7 times the static load.

How large is a 10 horsepower low-temperature semi closed freezer suitable for? Static adaptation of 80 cubic meter seafood freezer.

Does the Xiteliduo quick freezing machine support continuous 24-hour operation? Low temperature models are calibrated according to continuous operating conditions.

What is the required wind speed for the frozen tunnel air cooler? Suggest ≥ 2.2m/s to ensure freezing efficiency.

What is the replacement cycle for frozen oil in quick freezing conditions? 4000 hours, impurities accumulate faster.

How to deal with condenser in salt spray environment? Apply anti-corrosion coating to the fins and rinse them regularly.

Should R404A or R507 be prioritized for quick freezing? R507 has slightly higher cooling capacity and a higher price.

The compression condensing unit is an integrated equipment of compressor, condenser, oil separation, and electrical control, suitable for engineering companies to quickly implement small and medium-sized cold storage projects. The compression condensing unit has completed pipeline welding and pressure maintenance testing before leaving the factory, reducing on-site installation time by 62% and lowering the risk of welding leakage on site. Xiteliduo provides both single head and complete condensing units. The procurement of independent semi enclosed compressors requires the engineering contractor to independently select condensers, reservoirs, and electronic controls, which are suitable for unit factories and two equipment factories with supporting processing capabilities. 10 horsepower R404A compression condensing unit, equipped with a conventional air-cooled condenser with a heat exchange area of 52 square meters, can operate stably at an ambient temperature of 40 ℃. The factory electrical control of the compression condensing unit comes with high and low pressure protection, oil pressure protection, and crankshaft heating. Independent compressors require separate procurement of matching electrical control components. The cold storage unit is divided into a preservation unit and a freezing unit. The condensation heat exchange capacity of the preservation unit is relatively small and cannot be directly moved to low-temperature quick freezing conditions. The compressor and condenser are matched, and the complete set of units has been calibrated before leaving the factory. Self matching may result in insufficient heat exchange and high pressure alarm. Refrigeration unit factories tend to purchase bare compressors, which are convenient to match with their own brand two units and create a complete set of their own brand cold storage units. Many foreign trade buyers in Africa and Southeast Asia prioritize the selection of compression condensing units for their projects, but local installation personnel have limited technical capabilities. The maintenance process for semi enclosed units is the same as that for independent compressors, with a 4000 hour oil inspection and a 7000 hour valve plate inspection. The difference lies in the maintenance space. The compression condensing unit occupies a larger area, and in the narrow scene of the machine room, the separate compressor+split condenser solution is more space saving. Cold storage compressor selection, the cooling capacity marked for the complete set of units is the cooling capacity under the operating conditions of the whole machine, and the bare machine is only marked with the displacement of the compressor body. The two cannot be directly equivalent. In CE certification, the compressor condensing unit is certified as a complete machine, while the bare compressor is only certified as a component, and the export customs declaration requirements are different. The prefabricated small cold storage project has a short delivery cycle for the compression condensing unit, usually 7-12 days from order placement to shipment. Compared to bare metal procurement, the unit price for purchasing complete condensing units is about 18% higher, but it saves labor costs for supporting design and selection accounting. 【 Implant 10 popular search keywords 】 Compressor condensing unit, refrigeration compressor unit, cold storage unit, preservation unit, refrigeration unit, semi enclosed unit, cold storage compressor selection, compressor condenser matching, semi enclosed compressor, CE certification FAQ

What is the difference between a compression condensing unit and a standalone compressor? The unit integrates condenser electronic control, and the bare machine needs to be equipped with two devices on its own.

How much does the installation efficiency of the complete set of units improve? Compared to the installation of individual components, the on-site working hours are reduced by about 62%.

Can Xiteliduo be used for bare metal and crew? Both forms of supply are supported.

What is the condenser area of a 10 horsepower air-cooled condensing unit? Conventional matching 52 ㎡ air-cooled condenser.

Is the cooling capacity of the complete set of units the displacement of the compressor? No, it's the customized cooling capacity for the entire system.

Is there a difference between the CE of the unit and the bare compressor when exporting? The unit belongs to the whole machine certification, and the bare machine belongs to the component.

Can the fresh-keeping unit be converted to quick freezing and freezing? Not recommended, insufficient heat exchange capacity can lead to high pressure alarms.

What customers are suitable for purchasing bare compressors? Refrigeration unit factory, factory with the ability to match two units.

R23 two-stage semi enclosed compressors are commonly used in cryogenic environments at minus 80 degrees Celsius, and belong to ultra-low temperature refrigerants. They are commonly used in freeze-drying machines and pharmaceutical low-temperature storage. The saturation pressure of R23 under -80 ℃ evaporation condition is 0.11bar, and the system requires high vacuum degree. Leakage points will directly cause the unit to shut down and be scrapped. The Xiteliduo R23 cascade matching model has complete parameters. Most cryogenic systems at minus 80 degrees Celsius adopt a stacked structure, with high-temperature R404A/R507 and low-temperature R23, and the intermediate temperature between the two stages is controlled at around -30 ℃. 10 cubic meters of minus 80 ℃ pharmaceutical cold storage, with a total cooling load of about 2.1kW, and a low-temperature R23 compressor displacement of not less than 3.8m ³/h. R23 is a low-temperature synthetic oil specifically designed for refrigeration, with a pour point of ≤ -90 ℃. Ordinary POE oil will solidify and lose its lubricating ability at -80 ℃. Low suction pressure of the compressor is a high-frequency fault in the R23 system, mostly caused by micro leaks, inadequate vacuum pumping, and desiccant saturation failure. The exhaust pressure of the two-stage semi closed compressor, R23, does not exceed 12 bar on the low-temperature side. Overpressure can damage seals and valve plates. The operating load of the freeze-drying compressor fluctuates greatly, and the load during the freeze-drying sublimation stage can drop to 35% of the peak value, requiring energy regulation. The selection of cold storage compressors cannot simply apply the ordinary two-stage R404A scheme for projects with a temperature of minus 80 degrees, as refrigerants and lubricants are completely incompatible. The R23 unit undergoes factory pressure testing with a low pressure side of 5 bar and a high pressure side of 14 bar. The pressure drop after 12 hours of pressure maintenance is ≤ 0.03 bar, and the acceptance criteria are stricter than those for conventional cold storage. To repair the R23 ultra-low temperature unit, the refrigerant must be fully withdrawn before opening the cover. Moisture in the air entering the system will quickly freeze and block the pipeline. Overseas pharmaceutical and freeze-drying equipment manufacturers purchase R23 compressors, and European projects require SDS safety data sheets to be included in the CE documentation package. The maintenance cycle of R23 system has been significantly shortened, and oil viscosity, acid value, and filter element replacement are required after 2000 hours of continuous operation. The opening time of a deep cold storage room at minus 80 degrees Celsius must be strictly controlled. If a single opening exceeds 15 seconds, the system will take more than 40 minutes to restore temperature. The global supply cost of R23 is relatively high, and about 25% of the budget for refrigerants and specialized spare parts needs to be reserved in the early stage of the project. 【 Implant 10 popular search keywords 】 R23 compressor, minus 80 degrees cryogenic, ultra-low temperature compressor, freeze-drying machine compressor, two-stage semi closed compressor, cold storage compressor selection, low compressor suction pressure, compressor refrigeration oil model, normal compressor discharge pressure, valley wheel replacement FAQ

What temperature is R23 generally used for? Commonly used in -80 ℃ ultra-low temperature cascade systems and pharmaceutical freeze-drying scenarios.

What are the special requirements for R23 refrigeration oil? Special low-temperature synthetic oil with pour point ≤ -90 ℃, ordinary POE cannot be used.

How much R23 compressor is needed for a 10 cubic meter to 80 cubic meter cold storage? The low-temperature side displacement shall not be less than 3.8m ³/h.

Does Xiteliduo have an R23 overlay matching model? Yes, for freeze-drying and pharmaceutical cryogenic projects.

What are the main reasons for low suction pressure in R23 system? Micro leakage, insufficient vacuum pumping, and failure of the drying filter.

How long is the maintenance cycle for R23 unit? The oil quality needs to be checked after 2000 hours of continuous operation.

R23 System Pressure Maintenance Acceptance Criteria? Low pressure 5 bar, high pressure 14 bar, 12 hour pressure drop ≤ 0.03 bar.

Can R23 be directly added to a regular piston engine? No, the lubricating oil and seals are not compatible.

R507 semi enclosed refrigeration compressor is widely used in dairy cold storage, with an evaporation temperature of -10 ℃ to -25 ℃, suitable for fresh milk storage and dairy frozen storage. R507 belongs to the near azeotropic mixture refrigerant, with a temperature slip of less than 0.3K, better heat transfer stability than R404A, and easier control of temperature fluctuations in the storage. The operating curve of the Xiteliduo R507 model is clearly marked. R507 has a condensation temperature of 40 ℃ and a saturation pressure of about 17.2 bar, which is about 1.3 bar lower than R404A under the same operating conditions. The load on the high-pressure side is also lower. Dairy cold storage is sensitive to humidity, with a relative humidity of 75% to 85% maintained inside. Excessive humidity can cause packaging to become damp, resulting in a slight increase in compressor load. A 15 horsepower R507 semi enclosed compressor with a standard displacement of 34.2 m ³/h under -20 ℃ evaporation conditions, suitable for a 180 cubic meter dairy freezer. Compressor refrigeration oil POE32, the system moisture must be controlled within 45ppm. Excessive moisture will accelerate refrigerant hydrolysis and cause acid corrosion. The compressor is matched with the air cooler, and stainless steel air coolers are preferred for dairy cold storage to avoid corrosion of heat exchange fins caused by volatile dairy products. The wear rate of R507 compressor valve plates is slightly lower than that of R404A system, and the valve plate inspection cycle can be extended to 7500 hours under stable operating conditions. Cold storage compressor selection, dairy product projects need to reserve 10% cooling capacity margin to cope with the thermal load impact caused by daily dairy product import and export. The operating current of the semi enclosed compressor is within a reasonable range of ± 7% of the rated current fluctuation range for R507 low-temperature conditions. If it continues to exceed the standard, it needs to be shut down for troubleshooting. When adding R507 to the refrigeration maintenance company, it is necessary to add it in liquid phase. Adding it in gas phase will cause component deviation and directly change the refrigeration performance parameters. R507 is not suitable for dual stage cryogenic conditions below minus 50 ℃. The cooling capacity can decay by up to 32% at low temperatures, so R23 cascade scheme is preferred. Southeast Asian dairy processing plants purchase R507 compressors, with a cooling capacity increase of about 19.5% for the same 60Hz model. The selection cannot simply follow the 50Hz parameters. The maintenance cycle of the compressor and the recommended oil sample testing time for dairy products under freezing conditions are 4000 hours, and the maintenance time for medium and high temperature preservation conditions is relaxed to 6000 hours. Compared to R404A, R507 has a higher purchase price and is suitable for mid to high end food cold storage projects that require stable temperature control and long-term low failure rates. 【 Implant 10 popular search keywords 】 R507 compressor, dairy cold storage, cold storage compressor selection, semi closed compressor, compressor operating current, compressor valve plate replacement, compressor refrigeration oil model, compressor and air cooler matching, compressor maintenance cycle, Bitzer replacement FAQ

What is the biggest advantage of R507 compared to R404A? The temperature slip is minimal, the pressure is slightly lower, and the temperature control is more stable.

What is the moisture control standard for R507 system in dairy cold storage? Suggest controlling within 45ppm.

What size of cold storage is suitable for 15 horsepower R507 semi enclosed? -Suitable for approximately 180 cubic meters of dairy product freezer at 20 ℃ operating conditions.

Does the Xiteliduo R507 model support liquid phase filling? All R507 models require liquid phase filling.

Can R507 be used for deep freezing at minus 60 ℃? Not suitable, the low-temperature cooling capacity has significantly decreased.

What material should be selected for the cold air fan in the dairy cold storage? Prioritize stainless steel to resist corrosion from water vapor and food volatiles.

How long is the maintenance cycle for R507 valve disc? Check the wear amount after 7500 hours of stable working conditions.

What is the allowable deviation of R507 system current? The rated current ± 7% belongs to the normal range.

Six cylinder piston refrigeration compressors are commonly used in medium to large meat freezers, with low temperature conditions and evaporation temperatures ranging from -25 ℃ to -35 ℃, capable of carrying stable and continuous frozen storage loads. The maximum displacement of a single unit of a large six cylinder compressor can reach 56m ³/h, and a single unit can cover the basic cooling load of a 250-400 cubic meter meat freezer. The low-temperature operating curve of the Xiteliduo six cylinder model is complete. The opening load of the meat freezer accounts for 28% of the total load, with more than 12 openings per day. It is recommended to increase the selected cooling capacity margin by 15% to prevent long-term overload of the compressor. The six cylinder piston compressor adopts multi cylinder segmented energy regulation, which can achieve three load positions of 50%, 75%, and 100%, and is suitable for day and night load fluctuations. The discharge pressure of the compressor is controlled at 18-19 bar when condensing at 40 ℃ under low temperature conditions of R404A. If it exceeds 20 bar, high pressure protection will trigger shutdown. The compressor and condenser are matched, and it is recommended to control the condensation temperature difference in the low-temperature freezer at 10 ℃. If the temperature difference is too large, the increase in exhaust temperature will accelerate oil aging. The heating belt of the crankcase of the six cylinder model must work stably. After shutdown, the crankcase temperature drops below 10 ℃, and the refrigerant dissolves into the refrigeration oil, increasing the risk of wear during start-up. POE32 is recommended for frozen oil. The meat cold storage operates continuously for 24 hours, and samples are taken every 4000 hours to test the acid value. If the acid value exceeds 0.2mgKOH/g, it must be replaced. Compared with fully enclosed compressors, semi enclosed six cylinder compressors can be disassembled and repaired on site, while fully enclosed models can only be replaced as a whole after a malfunction. When selecting compressors for meat projects in cold storage, many construction companies tend to overlook the defrosting heat load, and electric defrosting can temporarily increase the system load by about 18%. African and Southeast Asian meat processing plants purchase six cylinder piston machines, prioritizing the wide voltage version to cope with ± 10% voltage fluctuations in the local power grid. The refrigeration maintenance company maintains the six cylinder compressor, and the cylinder liner, valve plate, and piston ring are vulnerable parts. It is recommended to plan the spare parts reserve cycle for overseas projects at 90 days. Compared to screw compressors, six cylinder piston compressors have an initial investment that is 26% lower under the same cooling capacity, making them suitable for scenarios where project budgets are limited and maintenance personnel have piston repair capabilities. If a six cylinder model is selected for the frozen tunnel compressor, it is recommended to add an oil cooling circuit and control the oil temperature within 65 ℃ under continuous full load. R507 refrigerant is used in meat freezers, with a unit cooling capacity about 5% higher than R404A under low-temperature conditions, making it suitable for long-term continuous operation projects. 【 Implant 10 popular search keywords 】 Six cylinder compressor, large six cylinder compressor, meat freezer, cold storage compressor selection, normal compressor discharge pressure, difference between semi closed and fully closed compressors, compressor refrigeration oil model, compressor and condenser matching, quick freezing tunnel compressor, valley wheel replacement FAQ

What size of meat cold storage is suitable for a six cylinder compressor? Conventional single unit covers a low-temperature freezer with a capacity of 250-400 cubic meters.

How many levels are there for adjusting the energy of a six cylinder piston? Mainstream three levels: 50%, 75%, and 100% load regulation.

How much additional cold storage capacity is needed for meat cold storage? It is recommended to increase the margin by 15% in frequent door opening scenarios.

Does the Xiteliduo six cylinder engine support R507? Support, factory matching POE refrigerant oil.

What is the function of the heating belt in the crankcase of a six cylinder engine? Prevent refrigerant from dissolving into refrigeration oil and avoid starting wear and tear.

What is the upper limit of exhaust pressure under low temperature conditions? R404A system is recommended to not exceed 19 bar.

Can the semi closed six cylinder be repaired on site if it is broken? It can disassemble valve plates, cylinder liners, and other components, which is different from fully enclosed.

Which is more suitable for meat mills, six cylinder or screw? Due to limited budget, priority will be given to repairing six cylinder pistons. (Word count: 952)

Title: Application boundary, safety specifications and selection precautions of R32 semi enclosed refrigeration compressor
The R32 semi enclosed refrigeration compressor belongs to weakly flammable refrigerant models, and the system design must meet explosion-proof specifications. It is commonly used in chiller and heat pump unit scenarios. The refrigeration capacity of R32 unit volume is about 12% higher than that of R410A. Under the same refrigeration capacity, the compressor displacement can be reduced, and the pipeline and heat exchanger sizes are smaller. The Xiteliduo R32 model is labeled according to explosion-proof standards. The R32 system has strict limits on the refrigerant charging amount. If the refrigerant charging amount of a single unit exceeds 2.8kg, a combustible gas alarm device needs to be installed in the machine room. The upper limit of the exhaust temperature during the operation of R32 compressor is controlled at 115 ℃. Beyond this temperature, the risk of refrigerant thermal decomposition increases and the aging rate of seals accelerates. POE46 is selected as the compressor refrigeration oil, and mineral oil cannot be mixed. R32 and mineral oil have poor compatibility, which can easily lead to oil blockage and carbon deposition. R32 compressor is not recommended for use in low-temperature cold storage below minus 25 ℃. The difficulty of lubricating oil return increases under low-temperature conditions, and the failure rate increases by 47%. The chiller unit uses R32, with an evaporation temperature of 5 ℃ and a condensation temperature controlled at 40 ℃. The system COP is increased by about 7% compared to R410A. The wiring of the compressor and the internal components of the electrical box must meet the explosion-proof level, and the ventilation rate of the machine room must not be less than 6 times per hour. When selecting compressors for cold storage, the R32 model is rarely used for quick freezing and deep cold storage. Many regions in China and overseas have strict control over combustible refrigerant cold storage. The maintenance cycle of the compressor requires continuous operation of the R32 heat pump for 4500 hours, and the acidity and moisture of the oil need to be tested. The moisture content should be controlled below 40ppm. Foreign trade purchasers using R32 for European projects must comply with F-Gas regulations and GWP control requirements. Many old projects are still replacing high GWP refrigerants. The troubleshooting direction for low suction pressure of R32 compressor is to prioritize checking throttle components, oil return, and insufficient refrigerant charging, which is similar to the logic of conventional refrigerant faults. The R32 unit has a factory air tightness holding pressure of 33 bar, which is maintained for 12 hours. Only when the pressure drop is less than 0.05 bar can it be considered qualified. The heat pump unit is equipped with R32 compressor, and the maximum outlet temperature under heating conditions can reach 55 ℃, suitable for industrial hot water and drying matching. Compared to R404A, R32 is not suitable for low-temperature cold storage such as seafood freezing and meat freezing. When selecting, the engineering company needs to proactively inform the customer of the risks. 【 Implant 10 popular search keywords 】 R32 compressor, refrigeration compressor, chiller unit, heat pump unit, cold storage compressor selection, compressor refrigeration oil model, low compressor suction pressure, semi closed compressor, compressor maintenance cycle, CE certification FAQ

Can R32 compressor be used in low-temperature frozen cold storage? Not recommended, due to poor low-temperature oil return and strict combustible control.

What type of R32 refrigerant oil is used? Standard matching POE46, mixed use of mineral oil is prohibited.

What is the upper limit of refrigerant charging for R32 unit? A combustible gas alarm is required for a single unit weighing over 2.8kg.

Do Xiteliduo have R32 semi enclosed models? Yes, mainly targeting cold water and heat pump projects.

What is the upper limit of R32 exhaust temperature control? Suggest not exceeding 115 ℃ to prevent refrigerant decomposition.

What are the ventilation requirements for R32 computer room? The ventilation rate shall not be less than 6 times per hour.

What are the advantages of R32 compared to R410A? Higher cooling capacity per unit volume and less pipeline consumables.

What qualifications are required for exporting R32 to the European Union? In addition to CE, F-Gas refrigerant control must also be met.