In the refrigeration industry, in order to expand the scope of application of refrigeration equipment, the cold water generated by cold water is often sent by long-distance, so that some auxiliary equipment and auxiliary medium are needed. Get cold energy in the evaporator, and then transferred to the cooled cold objects need to assume that the transfer amount of cold medium called airborne cold refrigerant. As the cold refrigerant should have airborne substances, non-toxic, chemical stability, corrosion of the metal is small, low freezing point, high specific heat capacity, the proportion of small, high heat conductivity and reasonable price and a series of conditions. The refrigerant commonly used water, saline (calcium chloride, sodium chloride) and organic matter (ethylene glycol, alcohol etc.).
Although the refrigeration equipment can be used as refrigerant of many substances, but the refrigerant type suitable in a certain temperature range is not much. So we can first determine a good air-cooled chiller and water cooling system of the airborne refrigerant temperature and purpose, then select several refrigerant in the.
Applicable to a certain temperature range and purpose of use are two main aspects to the air / water cooled refrigerant selection, the following specific selection method:
1, the evaporation temperature is over 5 DEG C cold refrigerant system is airborne, using water as coolant. However, the freezing point of water is high, which greatly limits the scope of application of water as refrigerant in refrigeration engineering.
2, if the evaporation temperature of 5 ~ -50 in the temperature range, generally using sodium chloride solution or calcium chloride brine as refrigerant. Because of the limitation of eutectic point, NaCl solution is used at 5 ~ -16 DEG C, and calcium chloride saline solution can be used in 5 ~ -50 DEG C system.
With saline solution as coolant, is common in refrigeration engineering, such as ice, refrigeration products, drinking wine production or other industry production
But the disadvantage of saline solution: that is, the metal corrosion, if used in the food industry, when the leak will have a certain impact on food. If it has to be used, the material of the chiller can be positioned in stainless steel. For the processing of specific foods, can be used in ethylene glycol water solution and alcohol water solution such as air-cooled chiller, chiller coolant.
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