Classification of refrigerants

(1) Low temperature and high pressure refrigerant

The condensing pressure at room temperature is between 2 and 3 MPa, and the normal vaporization temperature is lower than -70 C. There are mainly R13, R14 and R503, etc., which are suitable for the low-temperature refrigeration device and the low-temperature part of the cascade refrigeration, and this part is a special refrigerant, which does not belong to the common ones.

(2) Medium temperature and medium pressure refrigerant

Condensing pressure at room temperature between 0.3 ~ 2MPa, the normal vaporization temperature between 0 ℃ ~ -70 ℃. Mainly R12, R22 and R502, etc., for refrigerators and small and medium-sized air conditioners.

(3) High temperature and low pressure refrigerant

Condensing pressure at room temperature below 0.2 ~ 0.3MPa between the normal vaporization temperature greater than 0 ℃. Mainly R11, R21, R113 and R114, etc., mostly used in air-conditioning system centrifugal compressor (the central air conditioning of major hotels first more R410a, a small number of R134a).