Estimation of Heat-transfer Characteristics for In-line Plate Finned-tube Heat Exchangers
碩士 === 國立成功大學 === 機械工程學系碩博士班 === 98 === The present study applies the finite difference method in conjunction with the least-squares scheme and the experimental temperature data to predict the average convection heat transfer coefficient and the fin efficiency on the rectangular vertical fin of two...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2010
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| Online Access: | http://ndltd.ncl.edu.tw/handle/01358543509854790814 |
| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 98 === The present study applies the finite difference method in conjunction with the least-squares scheme and the experimental temperature data to predict the average convection heat transfer coefficient and the fin efficiency on the rectangular vertical fin of two tubes plate finned-tube heat exchangers. The heat transfer coefficient on this rectangular fin is very non-uniform. Thus the whole plate fin is divided into several sub-fin regions in order to predict the average heat transfer coefficient and the fin efficiency on the fin from the knowledge of the experimental fin temperature. A double tube plate finn heat exchanger and some relative experimental equipments and set up in order to measure the fin temperature. The heat transfer coefficient can be predicted by using the present inverse scheme according to the temperature measurements on the fin. The results show that the average heat transfer coefficient will approach a fixed value under the free convection provided the fin spacing is larger than 0.035m, the heat transfer coefficient on the upstream region of the fin can be markedly higher than that on the downstream region in mixed convection. However, In order to evidence the accuracy of the present inverse scheme and the reliability of the some experimental formulas, a comparison of the average heat transfer coefficient between the present predicted results and the previous results in references is made.
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