采用不同工质的高温复合热泵开水器特性研究

Study on Characteristics of High-temperature Hybrid Heat Pump System for Boiling Water Heater with Different Refrigerants

中文关键词: 开水器  高温热泵  一机两用  制冷工质  性能系数  ?分析

英文关键词: boiling water heater  high-temperature heat pump  dual-purpose machine  refrigerant  COP  exergy analysis

中文摘要:

      热泵开水器具有较高的能源利用效率，是现有公共场所电加热开水装置的理想替代品。从提高能源效率和一机两用的角度，构建了一种高温复合热泵开水器系统。建立了系统热力学模型，选取R236fa、R245fa、R365mfc、R245ca、RC318、R236ea等六种较高临界温度的制冷工质，通过能量分析和?分析的方法，探讨了不同制冷工质对高温复合热泵开水器系统性能的影响。研究结果表明：R245fa作为工质的高温复合热泵开水器系统具有最佳的性能，而以RC318作为工质的系统性能最差。在给定工况下，R245fa作为工质系统制热性能系数（COPh）为2.47，而其制冷性能系数（COPc）为3.37，?损失和?效率分别为9.50 kW和48.93%；与R245ca相比，RC318作为工质系统的总能耗增加了39.66%。

英文摘要:

      At present, the heat pump boiling water heater as an ideal substitute for the electric boiling water heater in public places because of the high-energy efficiency. For efficiency improvement of the energy utilization and for boiling/chilled drinking water production in a machine, a high-temperature hybrid heat pump system used as the boiling water heater was proposed. The thermodynamic model of the novel system was established, and high critical temperature refrigerants, such as R236fa, R245fa, R365mfc, R245ca, RC318, R236ea, were selected to evaluate the influences of the refrigerants on the system performance by energy and exergy method. The results indicate that the high-temperature hybrid heat pump system using R245fa as working fluid has the highest energy efficiency. Under the standard operating conditions, the coefficient of performance at the heating mode (COPh) is 2.47, while the COP at the cooling mode (COPc) is 3.37. The system exergy destruction and exergetic efficiency were 9.50 kW and 48.93%，respectively. Compared with the R245fa, the system energy consumption of the RC318 as working fluid is increased by 39.66%.