International Journal

Effects of flash tank vapor injection on the heating performance of an inverter-driven heat pump for cold regions
Year of publication	2010
Title of paper	Effects of flash tank vapor injection on the heating performance of an inverter-driven heat pump for cold regions
Author	허재혁 , 정민우 , 김용찬
Publication in journal	International Journal of Refrigeration
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Abstract	A heat pump has received much attention as substitute for the conventional boiler or heating coil because of its high efficiency. For the wide application of the heat pump, the most important design factor is the performance degradation upon its installation in tropical and cold regions. In this study, the effects of flash tank vapor injection on the heating performance of a two-stage heat pump with an inverter-driven twin rotary compressor were measured and analyzed for compressor frequency ranging from 50 to 100 Hz at ambient temperatures of 15, 5, and 5 C. The COP and heating capacity of the injection cycle were enhanced by 10% and 25%, respectively, at the ambient temperature of 15 C. The total mass flow rate of the injection cycle was 30-38% higher than that of the non-injection cycle.
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