In this paper, the impact of gas/liquid injection on the behaviour of new alternative refrigerant mixtures such as; R-410A, R-507, R-407C, and R-404A is discussed, analysed and presented. The test results were obtained using an air-source heat pump set up with enhanced surface tubing heat exchanger under various gas/liquid injection ratios. Performance tests were conducted according to the ARI/ASHRAE Standards. During the course of this experimental study, the performance characteristics of some proposed substitutes under various gas and gas/liquid injection ratios have been investigated, analysed and compared to that with no injection. The performance data demonstrated that the effect of gas/liquid injection on mixture behaviour and the heat exchanger capacity varies from mixture to another depending upon the mixture composition, boiling point and the evaporation temperature.

This content is only available via PDF.
You do not currently have access to this content.