CIESC Journal ›› 2014, Vol. 65 ›› Issue (z2): 256-264.DOI: 10.3969/j.issn.0438-1157.2014.z2.038

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Simulation of CO2 heat pump water heater with hybrid heat sources

LI Shanshan, LI Shuhong, ZHANG Xiaosong   

  1. School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China
  • Received:2014-08-18 Revised:2014-08-25 Online:2014-12-30 Published:2014-12-30

复合热源CO2热泵热水器的模拟分析

李姗姗, 李舒宏, 张小松   

  1. 东南大学能源与环境学院, 江苏 南京 210096
  • 通讯作者: 李舒宏

Abstract:

To improve the performance of the heat pump water heater, CO2 is used to develop a heat pump water heater using the hybrid heat sources for its advantages of environment-friendly and the unique thermodynamic properties. The steady state models, including heating collector/evaporator, compressor, gas cooler, regenerator and throttle, are established according to the lumped parameter method. The operating characteristics of the CO2 heat pump water heater using the hybrid heat sources are analyzed, and the changes of COP were proposed on varied structural parameters, pressure, temperature of CO2,environmental temperature and solar radiation. The results show that a higher COP is achieved for the CO2 heat pump water heater at the appropriate structure parameters, enviromental parameters and operation parameters. The value of COP is 6.0 while the ambient temperature and the solar radiation are 35℃ and 900 W·m-2 respectively.

Key words: CO2, hybrid heat source, COP, thermodynamic property, environment

摘要:

为提高热泵热水器的能源利用效率,充分利用CO2环保和独特的热力学性质等优势,设计了一种以CO2为工质的复合热源热泵热水器。针对该复合热源CO2热泵热水器的结构特点,运用集总参数法分别建立了集热/蒸发器、压缩机、气体冷却器、回热器和节流阀的稳态数学模型。通过所建模型分析了复合热源CO2热泵热水器的COP、制热量及耗电量随着不同的结构参数、压力、CO2温度、环境温度及太阳辐射强度等的变化规律。结果显示,该复合热源CO2热泵热水器在适当的结构参数、环境参数以及运行参数下能有较高的性能值,在环境温度35℃,太阳辐射强度900 W·m-2的工况下,系统的平均COP达到了6.0。

关键词: CO2, 复合热源, COP, 热力学性质, 环境

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