Heating performance comparison of different heat pump refrigerants at low temperature

Sets up an experimental device for a scroll compressor. Under the condition of evaporating temperature from -25 ℃ to 0 ℃ and condensing temperature of 45 ℃, tests the performance of R22, R134a, R410A, R1234ze and R1234yf in single stage compression system and the vapor injection system respectively. The results show that R410A has the largest heating capacity, R1234yf has the lowest discharge temperature and R1234ze has the highest heating COP. Compared with the single stage compression system, though the compressor power of the vapor injection system increases slightly, it can significantly reduce the discharge temperature, increase the heating capacity and the maximum increase of heating COP is 29.3%.