Abstract
The efficiency of an autocascade heat pump at low ambient temperatures in comparison with a cascade heat pump is investigated. The operation principle of an autocascade heat pump is based on the zeotropic property of mixed refrigerants, the components of which have different boiling points. A mixture of R32/R134a/R365mfc refrigerants was selected as a working fluid for the autocascade heat pump. R410a and R134a were selected as refrigerants for the cascade cycle. The simulation of heat pump cycles was carried out and graphs of the dependence of the coefficient of performance on the ambient temperature were plotted. It is shown that at ambient temperatures below – 20°С the autocascade heat pump is more efficient than a cascade heat pump. At ambient temperatures below – 35°C, the coefficient of performance of the autocascade heat pump is more than 7% higher than the coefficient of performance of the cascade heat pump.
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