An original collector/evaporator that gathering solar and air energy is a promising device to
reduce energy consumption. And the performances of self-designed heat pump with
hybrid heat source using different refrigerants were simulated in the present work. Based
on lumped parameter method, the steady state models, including collector/evaporator,
compressor and gas cooler, were established. The effects of R22, R134a and R744 were
analyzed in terms of power consumption, coefficient of performance (COP), solar energy
input ratio and so on. The results showed that three refrigerants performed an analogous
operating performance. R22 and R134a had a little difference considering different evaluation
factors. By contrast, CO2 had a poor COP, but it had a good low temperature
performance.