Key points for selecting compressors for ice making machines | Matching standards for refrigerant and exhaust volume for different ice production models
The evaporation temperature of commercial ice makers under continuous ice production conditions is concentrated between -12 ℃ and -20 ℃, with a unit ice production cooling load of about 0.85kW/ton. Small four cylinder semi closed piston compressors are often used. The ice making system operates continuously without interruption, with an annual operating time generally exceeding 7200 hours. The compressor's volumetric efficiency deteriorates 17% faster than intermittent cold storage, and the maintenance rhythm needs to be planned in advance. The Xitelidou small four cylinder semi closed compressor is suitable for the matching needs of sheet ice machines and block ice machines. R507 is the mainstream refrigerant in ice making scenarios, and the exhaust temperature under the same working conditions is 9K lower than R404A, which is more conducive to long-term continuous operation. The displacement of the compressor directly determines the upper limit of ice production. For a 1 ton/24-hour flake ice machine, the theoretical displacement of the matched compressor should not be less than 6.2m ³/h. Insufficient displacement will result in the ice production not reaching the nameplate parameters. The condenser of the ice maker is located in a workshop with a lot of dust for a long time. The fins should be cleaned every 3 months. A dust accumulation thickness of 0.8mm can cause a 25% decrease in condensation heat transfer and frequent triggering of high-pressure protection. The selection of refrigeration oil for the ice maker compressor should match the refrigerant, and POE ester oil is standard for R507. Mixing mineral oil will cause oil blockage and lubrication failure after 500 hours of operation. Many ice making factories tend to directly apply the compressor parameters of the fresh-keeping warehouse when purchasing, but the upper limit of the pressure ratio of the medium and high temperature compressors is insufficient, resulting in a 2.1-fold increase in valve wear rate under long-term ice making conditions. The foreign trade orders of African ice making plants continue to rise, and the salt content of local water sources is high, which increases the risk of corrosion of water-cooled condensers. When purchasing, priority should be given to requiring heat exchangers to be treated with anti-corrosion coatings. The compressor wiring diagram needs to be accompanied by an English version to be provided to overseas maintenance technicians. Reversing the power phase sequence can cause the oil pump to reverse, resulting in insufficient oil supply and cylinder pulling faults within 30 minutes. The demand for OEM manufacturing of ice maker compressors is increasing year by year. Refrigeration unit manufacturers can adjust the motor voltage according to customer requirements, covering multiple specifications of 380V, 415V, and 460V for foreign trade needs.
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FAQ
What is the typical evaporation temperature range for ice making conditions? Conventional -12 ℃ to -20 ℃, belongs to stable low-temperature conditions.
What is the required displacement for a one ton ice machine per day? The theoretical displacement shall not be less than 6.2 cubic meters per hour.
Can the R507 ice maker be filled with mineral refrigerant oil? No, it must be paired with POE ester refrigeration oil.
Does the accumulation of dust in the condenser significantly affect heat transfer? 0.8mm dust accumulation, condensation heat transfer attenuation can reach 25%.
Is the ice making compressor suitable for intermittent operation models? Not suitable, long-term continuous operation requires higher durability of the model.
What are the hazards of opposing the ice making compressor in phase sequence? Reverse rotation of the oil pump can easily lead to cylinder damage in a short period of time.
What is the average annual operating time of an ice making compressor? Most commercial ice making equipment operates for over 7200 hours annually.
