Research on Performance of Heat Pump Systems Using R744 /R600 and R744 /R600a Mixtures as Refrigerants
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 R...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Refrigeration Magazines Agency Co., Ltd.
2011-01-01
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| Series: | Zhileng xuebao |
| Subjects: | |
| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2011.06.035 |
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| Summary: | 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. |
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| ISSN: | 0253-4339 |