Experimental Study of the Air Side Performance of Fin-and-Tube Heat Exchanger with Different Fin Material in Dehumidifying Conditions
Under dehumidifying conditions, the condensed water will directly affect the heat transfer and resistance characteristics of a fin-and-tube heat exchanger. The geometrical form of condensed water on fin surfaces of three different fin materials (i.e., copper fin, aluminum fin, and aluminum fin with...
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2021-10-01
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| Online Access: | https://www.mdpi.com/1996-1073/14/21/7030 |
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| author | Wan-Ling Hu Ai-Jun Ma Yong Guan Zhi-Jie Cui Yi-Bo Zhang Jing Wang |
| author_facet | Wan-Ling Hu Ai-Jun Ma Yong Guan Zhi-Jie Cui Yi-Bo Zhang Jing Wang |
| author_sort | Wan-Ling Hu |
| collection | DOAJ |
| description | Under dehumidifying conditions, the condensed water will directly affect the heat transfer and resistance characteristics of a fin-and-tube heat exchanger. The geometrical form of condensed water on fin surfaces of three different fin materials (i.e., copper fin, aluminum fin, and aluminum fin with hydrophilic layer) in a fin-and-circular-tube heat exchanger was experimentally studied in this paper. The effect of the three different fin materials on heat transfer and friction performance of the heat exchanger was researched, too. The results show that the condensation state on the surface of copper fin and aluminum fin are dropwise condensation. The condensation state on the surface of the aluminum fin with the hydrophilic layer is film condensation. For the three different material fins, increasing the air velocity (<i>u</i><sub>a,in</sub>) and relative humidity (<i>RH</i><sub>in</sub>) of the inlet air can enhance the heat transfer of the heat exchanger. Friction factor (<i>f</i>) of the three different material fins decreases with the increase of <i>u</i><sub>a,in</sub>, however, increases with the increase of <i>RH</i><sub>in</sub>. At the same <i>u</i><sub>a,in</sub> or <i>RH</i><sub>in</sub>, Nusselt number (<i>Nu</i>) of the copper fin heat exchanger is the largest and <i>Nu</i> of the aluminum fin with hydrophilic layer is the smallest, <i>f</i> of the aluminum fin heat exchanger is the largest and <i>f</i> of the aluminum fin with hydrophilic layer is the smallest. Under the identical pumping power constrain, the comprehensive heat transfer performance of the copper fin heat exchanger is the best for the studied cases. |
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| format | Article |
| id | doaj.art-eadcad592888409382e04473150ffdc3 |
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| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T06:04:08Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
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| series | Energies |
| spelling | doaj.art-eadcad592888409382e04473150ffdc32023-11-22T20:42:30ZengMDPI AGEnergies1996-10732021-10-011421703010.3390/en14217030Experimental Study of the Air Side Performance of Fin-and-Tube Heat Exchanger with Different Fin Material in Dehumidifying ConditionsWan-Ling Hu0Ai-Jun Ma1Yong Guan2Zhi-Jie Cui3Yi-Bo Zhang4Jing Wang5School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, ChinaSchool of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, ChinaSchool of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, ChinaSchool of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, ChinaSchool of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, ChinaSchool of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, ChinaUnder dehumidifying conditions, the condensed water will directly affect the heat transfer and resistance characteristics of a fin-and-tube heat exchanger. The geometrical form of condensed water on fin surfaces of three different fin materials (i.e., copper fin, aluminum fin, and aluminum fin with hydrophilic layer) in a fin-and-circular-tube heat exchanger was experimentally studied in this paper. The effect of the three different fin materials on heat transfer and friction performance of the heat exchanger was researched, too. The results show that the condensation state on the surface of copper fin and aluminum fin are dropwise condensation. The condensation state on the surface of the aluminum fin with the hydrophilic layer is film condensation. For the three different material fins, increasing the air velocity (<i>u</i><sub>a,in</sub>) and relative humidity (<i>RH</i><sub>in</sub>) of the inlet air can enhance the heat transfer of the heat exchanger. Friction factor (<i>f</i>) of the three different material fins decreases with the increase of <i>u</i><sub>a,in</sub>, however, increases with the increase of <i>RH</i><sub>in</sub>. At the same <i>u</i><sub>a,in</sub> or <i>RH</i><sub>in</sub>, Nusselt number (<i>Nu</i>) of the copper fin heat exchanger is the largest and <i>Nu</i> of the aluminum fin with hydrophilic layer is the smallest, <i>f</i> of the aluminum fin heat exchanger is the largest and <i>f</i> of the aluminum fin with hydrophilic layer is the smallest. Under the identical pumping power constrain, the comprehensive heat transfer performance of the copper fin heat exchanger is the best for the studied cases.https://www.mdpi.com/1996-1073/14/21/7030condensate dropletdehumidifying conditionsfin-and-tube heat exchangerfin material |
| spellingShingle | Wan-Ling Hu Ai-Jun Ma Yong Guan Zhi-Jie Cui Yi-Bo Zhang Jing Wang Experimental Study of the Air Side Performance of Fin-and-Tube Heat Exchanger with Different Fin Material in Dehumidifying Conditions Energies condensate droplet dehumidifying conditions fin-and-tube heat exchanger fin material |
| title | Experimental Study of the Air Side Performance of Fin-and-Tube Heat Exchanger with Different Fin Material in Dehumidifying Conditions |
| title_full | Experimental Study of the Air Side Performance of Fin-and-Tube Heat Exchanger with Different Fin Material in Dehumidifying Conditions |
| title_fullStr | Experimental Study of the Air Side Performance of Fin-and-Tube Heat Exchanger with Different Fin Material in Dehumidifying Conditions |
| title_full_unstemmed | Experimental Study of the Air Side Performance of Fin-and-Tube Heat Exchanger with Different Fin Material in Dehumidifying Conditions |
| title_short | Experimental Study of the Air Side Performance of Fin-and-Tube Heat Exchanger with Different Fin Material in Dehumidifying Conditions |
| title_sort | experimental study of the air side performance of fin and tube heat exchanger with different fin material in dehumidifying conditions |
| topic | condensate droplet dehumidifying conditions fin-and-tube heat exchanger fin material |
| url | https://www.mdpi.com/1996-1073/14/21/7030 |
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