1. The working temperature and pressure of refrigerant should be moderate.
At atmospheric pressure, the evaporation temperature of refrigerant should be low enough to meet the cooling temperature requirements.
At room temperature, the refrigerant should have a relatively low condensation pressure. When the condensation pressure is too high, the structural strength of the sealant of the refrigeration system is required to be high. The condensation pressure of refrigerant is generally required to be 12 *105-15 *105Pa.
At room temperature, refrigerant should have relatively high evaporation pressure, because if the pressure in the evaporator is lower than the atmospheric pressure, the outside air easily enters the cooling system through the gap, which increases the pressure in the system, reduces the refrigeration capacity and increases power consumption. At the same time, the moisture in the air will cause ice jam and other harmful effects in the refrigeration system.
2. Refrigerants should have large unit volume refrigeration capacity
For refrigeration equipment of the same specification, when the refrigerant unit volume refrigeration capacity is large, the larger refrigeration capacity can be obtained.
Under the same working condition, when the refrigeration capacity is constant, the refrigerant volume per unit volume of refrigerant is large, which can reduce the refrigerant volume of the system, and also the size of the compressor.
3. The critical temperature of refrigerant should be high and the freezing point should be low.
High critical temperature makes it easy for refrigerant to condense and weigh liquid at ambient temperature; low freezing point can produce lower temperature, expand the range of refrigerant temperature, reduce throttling loss and improve refrigeration coefficient.
4. The viscosity and density of refrigerants should be as small as possible.
Low viscosity and density can make the flow resistance of refrigerant cycle in the system smaller, reduce the cycle power consumption, appropriately reduce the diameter of the pipeline, and allow the pipeline to have a smaller bending radius (which is very important for reducing the pressure loss of the evaporator), but also reduce the impact of the refrigerator on the valve group in the compressor. Long service life of compressor.
5. High thermal conductivity and Exothermic Coefficient of refrigerants
High thermal conductivity and exothermic coefficient can appropriately reduce the structure of heat exchanger in refrigeration system and improve the heat transfer efficiency of heat exchanger.
6. Requirements for Refrigerants in Other Aspects
It is non-combustible, non-explosive, non-toxic, non-corrosive, affordable and easy to purchase.
