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Commercial refrigeration refrigeration equipment commissioning impact (two)
commercial refrigeration refrigeration equipment commissioning impact (two)
3. The suction temperature of the compressor The suction temperature of the compressor refers to the refrigerant temperature at the suction valve. In order to ensure the safe operation of the compressor and prevent the phenomenon of liquid hitting the cylinder, the suction temperature should be higher than the evaporation temperature, which means that the commercial refrigeration refrigerant gas becomes a superheated gas with a certain degree of superheat. Under normal circumstances, in a Freon refrigeration device without a gas-liquid superheater, the suction temperature should be about 5℃ higher than the evaporating temperature (that is, 5℃ superheat) is more appropriate: when there is a gas-liquid superheater, keep it An inspiratory superheat of 15°C is suitable. For ammonia refrigeration equipment, the suction superheat is generally 5~10℃.
4. The discharge temperature of the compressor The discharge temperature of the compressor refers to the cooling temperature at the discharge valve. In order to ensure the safe operation of the compressor, it is stipulated that the exhaust temperature of the R12 device cannot exceed 130°C, and the R22 and ammonia device cannot exceed 150°C. Excessive exhaust temperature will cause commercial refrigeration lubricating oil to decrease in viscosity due to temperature increase, which will make the lubrication effect worse and cause damage to moving parts. When the exhaust gas temperature rises to close to the flash point of the lubricant, it is also prone to danger.
5. The subcooling temperature of the liquid refrigerant is to prevent the liquid refrigerant from generating flash gas in the liquid pipe before the expansion valve (throttle valve), and to ensure that the refrigerant entering the expansion valve is all liquid. The liquid refrigerant should have a certain The degree of subcooling (ie, the subcooling temperature). Different devices require different subcooling degrees according to the total pressure loss of the liquid pipe before the expansion valve (throttle valve). In order to meet the requirements of subcooling, a gas-liquid subcooler can be used. In the R22 device, the liquid pipe and the return air pipe are often bandaged together to achieve the purpose of supercooling.
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