| Autor: |
Wen Lih Chen, King Leung Wong, Li Wen Po |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
Applied Mechanics and Materials. :908-914 |
| ISSN: |
1662-7482 |
| Popis: |
Log mean temperature difference (LMTD) method neglecting the influence of heat radiation is conventionally used to calculate the total heat transfer rate of heat exchangers. From recent investigation of a single-pipe heat exchanger in some practical situations, it is found that the total heat transfer rate error of single-pipe heat exchanger obtained by LMTD method is up to 40% in the situation of oxidized metal heat exchanger with higher surface emissivity located in ambient air with low heat convection coefficient. A log mean heat transfer rate (LMHTR) method considering heat radiation has been developed to calculate the total heat transfer rate of a single-pipe heat exchanger and more accurate results can be achieved. It is also found in the present investigation that LMTD method is also not suitable to apply to non-insulated double-pipe heat exchangers and a more accurate LMHTR method considering heat radiation is developed to obtain the more reasonable results. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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