Yashilin analytical refrigerant is very important for high and low temperature test chambers

The refrigeration system is an important part of judging the performance of high and low temperature test chambers, but do you know? Different refrigerants have different uses and applications. Today, we will focus on the main refrigerants on the market.

First, low pressure high temperature refrigerant

The condensing pressure Pk ≤ 2 ~ 3 kg / cm (absolute), the evaporation temperature T0 > 0 ° C. For example, R11 (Freon 11, CFCL3, monofluorotrichloromethane, T0 = 23.7 ° C), R21, R114, T0 = 23.7 °C. This type of refrigerant is suitable for use in centrifugal refrigeration compressors for air conditioning systems. Usually 30 ° C, Pk ≤ 3.06kg / cm.

Second, medium pressure medium temperature refrigerant

The condensing pressure Pk ≤ 20 kg/cm (absolute), 0 ° C > T0 > -60 ° C. Such as R717 (ammonia, NH3), R12, R22 (Freon 22, CHCLF2, difluorochloromethane), R502 (an azeotropic refrigerant, composed of R22 and R115 (pentafluoro-chloroethane, C2F5CL)), etc. Such refrigerants are generally used in conventional single-stage compression and two-stage compression piston refrigeration compressors.

Third, high pressure low temperature refrigerant

The condensing pressure Pk ≥ 20 kg / cm (absolute), T0 ≤ -70 ° C. Such as R23 (Freon 23, CHF3, trifluoromethane), R13 (CF3CL), R14 (CF4), carbon dioxide (CO2), R503, ethane, ethylene, etc., such refrigerants are suitable for the low temperature part of cascade refrigeration equipment Or in a cryogenic device below -70 °C.

After reading the above, we learned that the high temperature test chamber, the fast temperature change test chamber, the high temperature part of the ultra low temperature test chamber at -70 °C use the medium temperature refrigerant (R404A), and the low temperature part uses the low temperature refrigerant (R23).