| 摘要: |
| 高温工业热泵运行时热源温度波动较大，压缩机外压比变化导致内外压比不相等，压缩机功耗上升，热泵能效下降。本文提出了采用经济器补气过程调节双螺杆压缩机内压力比的调节方式。通过向压缩腔中补充制冷剂气体，调节压缩机运行过程中的内压缩最终压力，使其与排气管道中压力相同，消除欠压缩过程，使压缩机实际压缩过程接近多变过程，降低运行附加功耗，增大热泵能效比。实验得到冷凝器90 ℃出水工况下不同补气压力时热泵的性能参数，结果表明：在最优补气压力下，压缩机绝热效率与热泵制热能效比同时达到最大，可实现通过调节补气压力调节压缩机内压力比的目的。 |
| 关键词: 高温热泵 双螺杆压缩机 内压力比调节 补气 |
| DOI： |
| 投稿时间：2016-12-22
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| 基金项目:国家自然科学基金（51576152）资助项目。 |
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| Inner-pressure Ratio Adjustment of the Twin-screw Compressor in a High-temperature Heat Pump |
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Xing Linfen1,2, He Yongning1, Cao Feng2, Zhang Yeqiang1, Yin Shujing3, Li Yaoquan3
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| (1.School of Energy and Power Engineering, Zhengzhou University of Light Industry;2.School of Energy and Power Engineering, Xi’an Jiaotong University;3.Simpsun Air Conditioning, Yangzhou) |
| Abstract: |
| Changing the working conditions of an industrial heat pump can cause a mismatch of the inner and outer pressure ratios of the twin-screw compressor. Over-compression and under-compression increase the compressor power consumption and decrease the heat-pump’s coefficient of performance (COP). Injecting refrigerant vapor into the compression chamber would increase the inner-pressure ratio and avoid under-compression. An experimental study was conducted with different injection pressures when the condenser outlet’s water temperature reached 90 ℃. The results show that the optimal injection pressure causes the COP and adiabatic efficiency to peak at the same time. This result shows that the vapor injection changes the compression process to a quasi-polytropic compression process. Adjusting the compressor’s inner-pressure ratio by changing the refrigerant-injection pressure is feasible. |
| Key words: high temperature heat pump twin screw compressor inner pressure ratio adjustment vapor injection |
