| 摘要: |
| 基于换热器中的传热窄点温差的限制，对R744/R600及R744/R600a在所研究的工况范围内分别替代传统制冷剂R22的亚临界热泵循环特性分别进行了计算分析。结果表明：R744/R600和R744/R600a具有不同的最优配比，可以使得制热性能系数（COPh）最大；R744/R600及R744/R600a在最优配比下的COPh分别比R22系统增大11.98%和8.24%，分别比纯质R600和R600a大36.43%和36.24%，比跨临界循环R744系统增加7.07%和4.71%。在最优配比下，R744/R600和R744/R600a的冷凝压力低于R22，分别为0.84MPa和1.18MPa；压缩机排气温度也低于R22，在90℃以下。 |
| 关键词: 热工学 非共沸混合工质 热泵 R744/R600 R744/R600a 传热窄点 |
| DOI： |
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| 基金项目:国家自然科学基金（50676059、51776207）项目资助。 |
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| Research on Performance of Heat Pump Systems Using R744 /R600 and R744 /R600a Mixtures as Refrigerants |
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Fan Xiaowei1, Zhang Xianping2,3, Wang Fengkun1, Shen Henggen2, Chen Shengguang1
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| (1.School of Energy and Environmental Engineering, Zhongyuan University of Technology;2.School of Environmental Science & Engineering, Donghua University;3.Department of Civil Engineering, Henan Institute of Engineering) |
| Abstract: |
| Under the given conditions, the system performances of R744/R600 and R744/R600a to substitute for conventional refrigerant R22 in a subcritical heating cycle were theoretically analyzed respectively with consideration of heat transfer pinch point in heat exchangers. Results show that R744/R600 and R744/R600a have different optimum mass fraction of which the system works with the maximum heating coefficient of performance (COPh). Compared to R22 system, the optimum COPh of R744/R600 and R744/R600a are increased by 11.98% and 8.24%; and increased by 36.43%, 36.24% compared to pure R600 and R600a; increased by 7.07%, 4.71% compared to pure R744 system in a transcritical cycle respectively. With the optimum mass fraction, condensation pressures of R744/R600 and R744/R600 are 0.84MPa and 1.18MPa lower than that of R22. Discharge temperatures are below 90℃ which are also lower than that of R22. |
| Key words: Pyrology Zeotropic mixture Heat pump R744/R600 R744/R600a Heat transfer pinch point |
