In the actual operation of refrigeration equipment and system engineering, the refrigeration system should not only be adjusted to a reasonable operating range, meet the requirements of the refrigeration process, and maintain its safe and normal operation, but also should and can further adjust the refrigeration system to the best operating state, to achieve the purpose of efficient and energy-saving operation, and improve the energy saving level of refrigeration equipment operation.

Evaporation temperature and evaporation pressure In the design of refrigeration equipment, increasing the evaporation temperature will reduce the compression ratio of refrigeration system and reduce power consumption, which is very beneficial to energy saving. The problem is that the evaporation temperature depends on the object being cooled, and the adjustment of the evaporation temperature must be based on the premise that it does not affect the refrigeration process requirements of the object being cooled. However, in the operation and adjustment of the refrigeration device, it is necessary to pay attention to observation and take corresponding measures in time, such as appropriate defrosting, appropriately increasing the amount of liquid supply, cleaning the evaporator for oil removal and dirt removal, and implementing effective energy regulation of the compressor, so that the evaporation temperature is stable at the design temperature, and it is necessary to avoid the evaporation temperature being unnecessarily too low.

From the point of view of energy saving, it is economical and reasonable to increase the evaporation temperature appropriately. The calculation shows that when the storage temperature of -25℃ is replaced by the storage temperature of -30℃, the electric energy will be saved by 9.8% due to the increase of evaporation temperature. Therefore, for the short storage period and the low temperature requirement of quality, the evaporation temperature can be appropriately increased to achieve the effect of energy saving. In addition, the general refrigeration device is designed according to full load, and the actual operation time at full load is not long, and most of the time is operated under conditions less than the design load. The same cooling effect can be achieved by reducing the heat transfer temperature difference of the evaporator by increasing the evaporation temperature when the partial load, that is, the cooling loss, is reduced.

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