R22와 HFC-134a를 사용한 냉동장치의 성능특성 연구

Abstract

Nowaday HCFCs refrigerant are restricted because it cause depletion of ozone layer. Accordingly, this experiment apply the HFC-134a and R22 to study the performance characteristic from superheat control and compare the energy effciency of refrigerants from the high performance. The condensing pressure of refrigeration system is increased from 1500kPa to 1600kPa and degree of superheat is increased from 0 to 5℃ at each condensing pressure. This study conducted the comparative analysis of performance of refrigerating system using HFC-134a and R22 with respect to the change in condensing pressure and superheat and the results are presented as follows. 1. The refrigerant Circulating rate shows similar stability for the condensation pressure and the degree of superheat change in HFC-134a and R22 refrigerant, and The refrigerant circulating rate of R22 is little less than HFC-134a's but the suction pressure of HFC-134a shows a lot less than R22. 2. If the condensation pressure and the degree of superheat is getting higher, refrigerant mass flow rate that incoming in an evaporator is decrease and condenstation rate is getting bigger and power is increase. So energy is getting loss a lot. 3. The requirement power of R22 is higher than HFC-134a and record factor of R22 is higher than HFC-134a but shows similar result. 4. In this research, HFC-134a and R22 shows similar performance quality, if preservation of the refrigeration system is becoming, HFC-134a is appropriate for substitution refrigerant of R22.