Liquid in the throttle too cold, in general, to improve the refrigeration cycle of cold water economy is always beneficial, but will increase the equipment investment and direct operating costs. Actual use should also consider the specific conditions, technical and economic analysis to determine whether the use of liquid over cooling.
     The determination of the liquid supercooling temperature before the throttling of the industrial chiller can be selected according to the following experience.
      In single stage compression system, the cooling of the liquid before throttling is realized in the gas liquid heat exchanger, and the cooling degree is generally 5 DEG C. In the two-stage compression system, the liquid before the throttling is generally over cooled for the past two times. The first is in the middle cooling, and then in the gas liquid heat exchanger. The liquid temperature of the cooling coil of the intermediate cooler is 5 to 7 DEG C higher than that of the two-stage compression intermediate temperature, and the liquid in the gas liquid heat exchanger is over cooled at the temperature of 5 DEG C.
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