Comparison of the Heating Performance of Heat Pumps based on Two Types of Natural Sub-cooling
The heating performance of a heat pump can be improved by using a natural cold source. In this study, two types of sub-cooling systems with natural cold source were proposed: main loop and by-pass loop. A theoretical analysis was conducted and an integrated test bench for an R32 vapor compression he...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Refrigeration Magazines Agency Co., Ltd.
2019-01-01
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| Series: | Zhileng xuebao |
| Subjects: | |
| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2019.02.068 |
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| Summary: | The heating performance of a heat pump can be improved by using a natural cold source. In this study, two types of sub-cooling systems with natural cold source were proposed: main loop and by-pass loop. A theoretical analysis was conducted and an integrated test bench for an R32 vapor compression heat pump was built. Running parameters such as the discharge temperature, heating capacity and heating coefficient of performance (COP) were investigated in the test bench based on three operation modes: main loop sub-cooling, by-pass loop sub-cooling, and a single-stage system. The results showed that for the main loop and by-pass loop sub-cooling systems, when the sub-cooling volume flow rate increased to 0.02 m3/h, the discharge temperature was reduced to 6.8 ℃ and 8.2 ℃, respectively. In addition, the heating capacity was reduced by 6.4% and 10%, and the heating COP was reduced by 2.5% and 5%, respectively. |
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| ISSN: | 0253-4339 |