Research Progress in Application of Heat Pump Technology under Wide Temperature Range Conditions
To study the coefficient of performance of the heat pump system and the reliability of the compressor when the ambient temperature is too low or the target heating temperature is too high in actual operation,the single-stage compression cycle can no longer meet the heating demand.The current application status of heat pump systems under wide temperature range conditions is summarized,and the factors that affect the energy efficiency of the system from technologies such as enhanced vapor injection,two-stage compression,and cascade systems are analyzed in this paper.The corresponding heat pump system can relatively increase the heating capacity by 12%to 15%compared to single-stage compression systems.The development trend and research focus of heat pump technology under wide temperature range conditions are prospected.This has practical significance for further promoting and applying heat pump technology.
Heat pump technologyEnhanced vapor injectionDual stage compressionStacking systemCoefficient of performance
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