2017 refrigerant performance and model list

Refrigerants are also called refrigeration working fluids, commonly known as refrigerants in some areas in the south. It is a working substance that continuously circulates in the refrigeration system and realizes refrigeration through its own state changes. The refrigerant absorbs the heat of the cooling medium (water or air, etc.) in the evaporator to vaporize, and transfers the heat to the surrounding air or water in the condenser to condense.

The function of the refrigerant is mainly to transfer heat through the change of its physical state. It circulates continuously in the refrigeration system. Under its evaporation pressure, the liquid refrigeration system can absorb heat and evaporate into gas. Under condensing pressure. The gaseous refrigerant emits heat and liquefies, and the heat is transferred in the device of the continuous circulation system. Therefore, the refrigerant is an indispensable working substance that transfers heat in the refrigeration system. In order to get closer to the ideal reverse Carnot cycle from the perspective of thermal engineering, certain requirements are required for the performance of the refrigerant, the heat exchange efficiency of the heat exchange equipment, and the heat transfer temperature difference, so as to make the refrigeration equipment more economical and reasonable. Less energy consumption. At the same time, the destruction of atmospheric ozone layer by certain refrigerants should be considered, and refrigeration methods and refrigeration equipment should be changed.

First, the most used refrigerant models are the following types according to their composition:

(1) Inorganic compounds. Water, ammonia, carbon dioxide, etc.

(2) Derivatives of saturated hydrocarbons, commonly known as Freon. Mainly derivatives of methane and ethane. Such as R12, R22, R134a, etc.

(3) Saturated hydrocarbons. Such as propane, isobutane, etc.

(4) Unsaturated hydrocarbons. Such as ethylene, propylene, etc.

(5) Azeotropic refrigerant mixture. Such as R502 and so on.

(6) Non-azeotropic mixed refrigerant. Such as R407c, R410 and so on.

Second, the refrigerant should have the following properties:

The refrigerant should have good thermal, physical, chemical and other properties, because it is completely ideal There is no refrigerant, but people should try to choose a refrigerant with better performance.

(1) The evaporating pressure and the condensing pressure are moderate, that is to say, at room temperature, it should have a lower condensing pressure, and the refrigerant evaporating pressure should be close to atmospheric pressure. Even higher than atmospheric pressure, it is advisable to use substances with a lower boiling point under atmospheric pressure.

(2) The refrigerating capacity per unit volume should be large, because the larger the refrigerating capacity, when a certain refrigeration capacity is required, the smaller the circulation of the refrigerant, which can reduce the volume of the refrigeration equipment

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(3) It is convenient to use general cooling water or air for condensation, that is, the critical temperature of the refrigerant is higher.

(4) High thermal conductivity and heat release coefficient, which can improve heat exchange efficiency.

(5) The solidification temperature is low under normal pressure.

(6) The density and viscosity of the refrigerant are required to be small, and the low density of the refrigerant can reduce the pipe diameter of the delivery pipe and also reduce the power consumption of the compressor.

(7) It has relatively stable chemical properties, should not decompose or combine at any temperature, does not corrode the pipeline, should not chemically react to the lubricating oil, and has a moderate solubility to the lubricating oil . Infinite dissolution can reduce cooling capacity.

(8) It should be non-toxic, non-irritating, and not easy to burn and explode.

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