In the past, Freon was widely used for heat pump systems.
At first, Refrigerant R22 occupied the market. But with the awareness of its
harm to the ozonosphere, besides raising the COP of heat pumps, scientists
strive to develop new working medium to replace Freon.
Nowadays, R410A and R407C are the most popular environmentally-friendly
refrigerants.
The working pressure of R410A is 1.6 times as high as
that of R22. It has steady and non-toxic performance. Free from chlorine, R410A
does no harm to the ozonosphere. It is accepted by the American and European
countries.
R407C
can work in the system of R22, but some components and lubrication oil have to
be changed. When filling the system, we must use liquid R407C for its
performance is not so steady.
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