What is the use of refrigerant in air source heat pump ?
When talking about refrigerant, most people think of air conditioners first. Indeed, as far as daily life is concerned, air conditioners are installed in almost every household, and the frequency of application is quite high. However, today we are not talking about air conditioners, but air source heat pumps that have a similar principle to air conditioners.Air conditioners are mainly used for refrigeration, and air source heat pumps are mainly used for heating. The heating principle of the air source heat pump is actually the inverse principle of air-conditioning refrigeration, which absorbs the heat energy in the air through the refrigerant. Therefore, it is not unreasonable to say that the refrigerant plays the most critical role in the heating of air energy. And what kinds of refrigerants are common in air? Let’s take everyone to get to know them today and walk into refrigerants
R22 is a single refrigerant, its scientific name is difluoro-chloromethane, and its boiling point is about -41°C. This kind of refrigerant is colorless and odorless, and is the most widely used in air conditioning systems, especially in split air conditioning and central air conditioning systems, which can be said to be seen everywhere. However, it has one of the biggest shortcomings, that is, it is actually a member of the Freon family, and when discharged into the air, it may damage the ozone layer and cause environmental problems.
R134A refrigerant
The composition of R134A is different from that of other refrigerants. It does not contain chloride ions, is not toxic, is not combustible in the air, and does not cause damage to the ozone layer. It seems perfect, but its boiling point is relatively low, only -26.5°C, which means that if it is used in an air source heat pump, once the ambient temperature drops, the amount of vaporization of this refrigerant will be greatly increased. Decrease, resulting in a decrease in the heating efficiency of the air source heat pump. Therefore, this kind of refrigerant is not as widely used as R22, and is generally used in indoor or high-temperature air source heat pumps.
R410A refrigerant
R410A refrigerant is an environmentally friendly refrigerant developed by scientists for the deteriorating environment. It is similar to R134A, colorless, volatile and non-flammable. The composition contains R32 and R125 refrigerants, the boiling point is about -51°C, does not contain chloride ions, and does not destroy the ozone layer. The water solubility is indistinguishable from R22, but the cooling capacity has been significantly improved. Now it is also the most common new environmentally friendly refrigerant in the air source heat pump industry!
R290 refrigerant
R29 is another new environmentally friendly refrigerant, colorless, slightly soluble in water, and ozone-free. But the safety factor is not high enough. If it is mixed with air, there is a certain probability of explosion, and if it encounters an open flame, it is easy to cause accidents. At present, in the industry, it is customary to use high-purity R290 refrigerant as the temperature sensing working fluid.
From the perspective of China's continuous emphasis on energy conservation and environmental protection, the development of air source heat pump refrigerants is also following the idea of environmental protection and pollution-free. In the future air source heat pump market, environmentally friendly refrigerants will surely occupy a place. Let's contribute to the blue sky defense war!
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