Experimental study on the performance of quasi-secondary system with subcooler and rotor compressor
To address the issues of performance degradation and excessive exhaust temperature of single-stage air source heat pump systems under extreme operating conditions,an experimental platform for a quasi-two-stage compression system with a subcooler was devised and constructed,and its performance was compared with that of a single-stage compression sys-tem.The results indicate that:In cooling mode,when the outdoor temperature ranges from 35 to 43 ℃,the cooling capacity of the quasi-two-stage compression system increases by 11.23％to 13.33％,and the exhaust temperature decreases by 7.1 to 14.3℃.When the outdoor temperature is 47 ℃,the single-stage compression system shuts down protectively.The energy effi-ciency ratio(EER)of the quasi-two-stage compression system is 1.66,and the exhaust temperature is 95.4 ℃.In heating mode,when the outdoor temperature varies from 2 to-15℃,the heating capacity of the quasi-two-stage compression system increases by 21.8％to 24.1％,the energy efficiency ratio(COP)increases by 4.9％to 15.7％,and the exhaust temperature decreases by 13.6 to 18.2℃.When the outdoor temperature is-20 ℃,the single-stage compression system shuts down pro-tectively.The COP of the quasi-two-stage compression system is 1.54,and the exhaust temperature is 94.5℃.This system enhances the performance of air source heat pumps under extreme operating conditions and broadens the application range.
Air source heat pumpQuasi-two level systemExhaust temperature
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