Influence of refrigerant on a perfect refrigeration cycle

Abstract

Thermodynamic properties of refrigerant really influence on a perfect refrigeration cycle. The lower the evaporation temperature is, the higher the compression ratio becomes, the higher the compressor's discharge temperature and more exergy loss, the differences between actual refrigeration cycle and Carnot cycle are more and more. The calculated results show that largest exergy loss occurs in the process of condensation and then to the compression process, the throttle process, the evaporation and finally, the process of heat recovery. Exergy loss of the heat recovery process is lower but the heat recovery process increases the perfect of the cycle. Therefore, the low temperature refrigeration cycles need to have some heat recovery equipment. Without technical losses, the maximum level of perfection of refrigeration cycle using refrigerant R134a, R22, R404A, R410A is about 0,42.

Key words: perfect refrigeration cycle, exergy loss, refrigerant.