Flow Path Optimization and Performance Study on Gravity Recirculation Evaporator
As gravity-fed recirculation evaporator is restricted by its principles, the structure of its flow path couldn’t be the same as that of the direct expansion cooling system. Firstly, in this paper, the flow path optimal principles of gravity-fed recirculation evaporator have been clarified, and two f...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Refrigeration Magazines Agency Co., Ltd.
2015-01-01
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| Series: | Zhileng xuebao |
| Subjects: | |
| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2015.01.101 |
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| Summary: | As gravity-fed recirculation evaporator is restricted by its principles, the structure of its flow path couldn’t be the same as that of the direct expansion cooling system. Firstly, in this paper, the flow path optimal principles of gravity-fed recirculation evaporator have been clarified, and two forms of flow path structures have been designed. The first is a flow path structure which is commonly used in the gravity-fed cooling system, and the second is an optimized flow path structure. A gravity-fed recirculation evaporator experiment platform is built based on the above. The evaporator performances before and after the optimization have been compared and analyzed. Results shows that, when the temperature of the insulation body keeps constant, the same circulation ratio and mean temperature difference can be guaranteed at the refrigerant-side of the four branches in parallel since the mean temperature of the air which contacts each of the branches of the optimized evaporator is the same.It is also shown that the optimized evaporation has a better performance, especially under the low-temperature condition. The second (ie. the optimized) evaporator has a greater heat transfer than the first (ie. the common) one based on per unit area, and the cooling capacity increased 60.3% and 44.1% respectively, and the COP increased 16% and 13.87% respectively for the condition of -25 ℃ and -20 ℃. |
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| ISSN: | 0253-4339 |