The Transient and Steady State Performance of R-22 and R-407C

This paper investigates the performance of the refrigerants R-407C and R-22 with and without a suction line heat exchanger. The cyclic and steady state performance of both refrigerants is investigated in an air conditioner/heat pump. The combined impact of cyclic and steady state performances is evaluated through the cooling and heating seasonal performances. The results show that R-407C has a 4.3% lower cooling seasonal performance and a 1.5–7.0% lower heating seasonal performance, depending on the climate in question. The steady state tests indicate that there is no benefit from using a suction line heat exchanger for either fluid. However, R-22 and R-407C benefit from the suction line heat exchanger during cyclic tests. Utilizing the suction line heat exchanger reduces the performance degradation associated with cyclic operation by 5.5% and 8.1% for R-22 and R-407C, respectively.