Reliable Method of a Non-Insulated Double-Pipe Heat Exchanger

King Leung Wong; Wen Lih Chen; Li Wen Po

doi:10.4028/www.scientific.net/AMM.284-287.908

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 284-287Reliable Method of a Non-Insulated Double-Pipe...

Reliable Method of a Non-Insulated Double-Pipe Heat Exchanger

Abstract:

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.

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Periodical:

Applied Mechanics and Materials (Volumes 284-287)

Pages:

908-914

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.284-287.908

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Online since:

January 2013

Authors:

King Leung Wong, Wen Lih Chen, Li Wen Po

Keywords:

Double-Pipe Heat Exchanger, Heat Convection, Heat Radiation, Log Mean Heat Transfer Rate (LMHTR) Method, Non-Insulation

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