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display cases Refrigeration equipment commissioning impact
display cases Refrigeration equipment commissioning
Refrigeration equipment commissioning is to adjust the display cases device operating parameters to work within the required range, so that the work of the refrigeration equipment can meet the design requirements, while the equipment is running The parameters work in a safe and economical range. The main parameters of
refrigeration device operation are: evaporating pressure and evaporating temperature, condensing pressure and condensing temperature, compressor suction temperature and discharge temperature, refrigerant temperature before expansion valve (or throttle), etc. These parameters are not fixed during the operation of the refrigeration device, but change with the changes of external conditions (such as the thermal load in the display cases, cooling water temperature, ambient temperature, etc.). Therefore, during the debugging process, it must be based on the external Conditions and characteristics of the device, adjust the operating parameters within a reasonable range.
The main operating parameters are described below.
1. Evaporating temperature and evaporating pressure Evaporating temperature to is the saturation temperature when the refrigerant in the evaporator vaporizes under a certain pressure, and this pressure is the evaporation pressure po. The evaporation temperature to of the device operation should be determined according to the temperature requirements of the cooled medium and its working characteristics. For example, for direct evaporation display cases, when the air is natural convection, the evaporation temperature is 10~15℃ lower than the required display cases temperature; when the air is forced circulation, the evaporation temperature is 5~10℃ lower than the display cases temperature. For the evaporator of the cooling liquid, its evaporation temperature to should be 4～6℃ lower than the average temperature of the liquid to be cooled.
2. Condensing temperature and condensing pressure Condensing temperature tk is the temperature at which the refrigerant gas condenses in the condenser, and the saturation pressure corresponding to the condensing temperature tk is the condensing pressure. The condensation temperature of pko depends on the temperature of the cooling water (or air) , The temperature rise of cooling water in the condenser and the form of the condenser. When air is used for cooling, the condensation temperature is 8~12℃ higher than the air temperature.
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