Refrigerants properties and the type of 2017

Refrigerant is also called the refrigerating agent, commonly known as snow in some areas of the south. It is a cycle in the refrigeration system and through its own change of state in order to realize the refrigeration work material. Refrigerant in the evaporator absorbed by the cooling medium ( With air or water, etc. ) Heat and evaporation, in the heart of the condenser heat transfer to the surrounding air or water and condensation. Refrigerant's function mainly through the change of the state of matter to transfer heat, it constantly circulating in the cooling system, in the evaporation pressure, liquid cooling system can absorb heat evaporation become gas, and under the condensing pressure. Gaseous refrigerant gives off heat and liquefaction, heat transfer in the continuous circulation system, so the refrigerant in the refrigeration system is necessary for the heat transfer of substance. 

 To closer to the ideal from the Angle of pyrology reverse carnot cycle, on the performance of the refrigerant and heat exchange equipment in thermal efficiency, heat transfer temperature difference and so on all needs to have certain requirements, in order to make more economical and reasonable refrigeration equipment, less energy consumption. 

 At the same time, should consider some refrigerants of atmospheric ozone layer destruction, and change the cooling methods and cooling equipment. The highest one, the main use of refrigerant type? 

 According to the composition has the following kinds: 

( 1) Inorganic compounds. Water, ammonia, carbon dioxide, etc. ( 2) The derivatives of saturated hydrocarbons, commonly known as freon. Mainly of methane and ethane derivatives. Such as R12, R22, everything, etc. ( 3) Saturated hydrocarbons. Such as propane and isobutane ( 4) Unsaturated hydrocarbons. Such as ethylene, propylene, etc. ( 5) Azeotropic mixture refrigerants. Such as r114, etc. ( 6) Non azeotropic mixed refrigerants. 

Such as R407c, R410 etc. Refrigerant should has the following properties: refrigerants should have good thermal performance, physics, chemistry, etc, because there is no ideal refrigerant completely, but people should try to choose good refrigerant performance. 

 ( 1) Moderate evaporating pressure and condensing pressure, that is to say, at room temperature, should have a lower condensing pressure, and refrigerants evaporating pressure had better close to the atmospheric pressure. Even higher than the atmospheric pressure, appropriate USES boiling point lower material under the atmospheric pressure. 

 ( 2) Unit volume refrigeration capacity have thrown, because of the greater the refrigeration capacity, for certain refrigerating capacity in the refrigerant cycle quantity is small, it can reduce the volume of refrigeration equipment

 ( 3) Facilitate condensation with general of the cooling water or air, and the critical temperature of refrigerant is high. 

 ( 4) Coefficient of thermal conductivity, high coefficient of heat release, can improve the efficiency of heat exchange.

 ( 5) Low pressure setting temperature.

 ( 6) For refrigerant density and low viscosity and density of refrigerant xiaoke minimize delivery pipe diameter, may also reduce the compressor power consumption.

 ( 7) Has a stable chemical properties, at any temperature should not break down, or combined, no corrosion of pipeline, the oil should be no chemical reaction, the solubility of lubricating oil should be moderate. Can reduce the dissolution of infinite refrigerating capacity.

 ( 8) Should be non-toxic, no stimulation to the person, not easily burning explosion.
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