Experimental Study On The Performance Of Inter Mediate Vapor Compression Heat Pump System With Regenerative Subcooler

The conventional single-stage compressed air source heat pump has poor heating performance when preparing high-temperature hot water under low ambient temperature conditions,and the intermediate-filled compressed heat pump system with reflux heat exchanger is not only able to obtain heat generation.Lifting,at the same time,can reduce the compressor discharge temperature;secondly,the recuperative subcooler can make the condenser outlet refrigerant have a large degree of subcooling,and also lower the temperature of the refrigerant before entering the throttle valve.In turn,it can greatly increase its heat production.At present,there are few researches on the heating performance of heat pump systems with regenerative subcoolers.Therefore,the performance parameters of heat pump systems with regenerative subcoolers under different working conditions are studied experimentally.The mathematical model was used to analyze the intermediate vapor-entrained heat pump system with reflux heat exchanger,and the influence of intermediate gas on the heating performance of the system was analyzed.The experimental study on the heating performance parameters of the intermediate vapor-entrained heat pump system with R134 a as the working medium with the recirculating heat exchanger is carried out,and the heating performance parameters of the intermediate air-compressed heat pump system are analyzed.Changes with tank temperature,intermediate plenum pressure and ambient temperature.Through theoretical and experimental results,it is concluded that with the increase of the intermediate vapor pressure,the intermediate vapor temperature,heating capacity and input power are increased to different degrees,while the compressor exhaust temperature is significantly reduced,and the COP changes are small.And the higher the temperature of the water tank,the greater the decrease of the exhaust gas temperature,and the more obvious the heating performance improvement effect;With the change of the intermediate gas pressure,the system heat,COP and system stability are considered comprehensively under the conditions of evaporation temperature of-7? and tank temperature of 44?,48?,52?,56 ? and 60 ?,respectively.Sexually,the optimal intermediate gas pressure range of the system is 0.4MPa~0.46 MPa.