冷热两用型饮用水复合高温热泵系统性能研究

Investigation on Performance of Hybrid Heat Pump System with Cogeneration of Boiling and Chilled Drinking Water

从提高能源效率的角度,提出了一种以R245fa作为工质的冷热两用型饮用水复合高温热泵系统,建立了系统热力学模型,探讨了不同因素对系统性能因数和热力完善度的影响。分析比较冷热两用型饮用水复合高温热泵系统与传统电开水器的能耗和经济性,理论上验证了该系统应用的可行性。研究结果表明:制热模式下,新系统的年均性能因数COPh.ave为1.79,年均热力完善度ηh,ave为42.8%;制冷模式下,新系统的年均性能因数COPc,ave为4.92,年均热力完善度ηc,ave为37.0%。冷水箱进水温度为50℃时,与传统电开水器相比,新系统的年均节能效率达到66.32%。

In view of the efficiency of the energy utilization,a hybrid heat pump system with cogeneration of boiling and chilled drinking water with R245fa as working fluid was proposed.The system could produce the boiling and chilled drinking water at the same time.In this paper,the thermodynamic model of the system was established.The effect of different factors on the system performance coefficient and thermal perfection was discussed.Comparative analysis of the energy consumption and economy between the novel system and traditional boiling water heater proved the feasibility of system application by the theoretical method.The result indicates that under the standard operating conditions,the annual average coefficient of performance(COP)of the heating cycle COPh,ave is 1.79,and the annual average thermal stabilityηh,ave is 42.8%.The annual average COP of the cooling cycle COPc,ave is 4.92,and the annual average thermal stabilityηc,ave is 37.0%.When the water inlet temperature of the cold water tank is 50℃,compared with the electric boiling water heater,the annual energy saving efficiency of the novel system is 66.32%.