Theoretical and Experimental Investigation on R245fa High-temperature Water Steam Heat Pump System
High-temperature steam is in great demand for many industrial applications. The electric boilers used to replace traditional boilers in rural areas are not efficient enough to be employed in large-scale steam production. Furthermore, a large amount of heat appears to be wasted in related industries,...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Refrigeration Magazines Agency Co., Ltd.
2018-01-01
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| Series: | Zhileng xuebao |
| Subjects: | |
| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2018.01.028 |
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| Summary: | High-temperature steam is in great demand for many industrial applications. The electric boilers used to replace traditional boilers in rural areas are not efficient enough to be employed in large-scale steam production. Furthermore, a large amount of heat appears to be wasted in related industries, so the employment of high-temperature heat pumps is quite promising in producing high-temperature steam. In this paper, an R245fa high-temperature heat pump system is applied to the production of steam. A mathematical model is developed to predict the performance of each component and the heat pump system, and an experimental investigation is also conducted. The results illustrate that, with an increase in evaporation temperature, the coefficient of performance (COP) and heat capacity increase, whereas the discharge temperature decreases. The relative COP ranges from 0.55 to 1.3 in the target operating conditions. The heat exchange efficiency is observed to increase from 1.7 to a maximum of 2.8 kW/(m2?K) as the water flow rate increases. |
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| ISSN: | 0253-4339 |