An Analysis of Heat Exchanger Considering the Temperature Distribution Perpendicular to Heat Exchanger Surface

概要

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Energy equations for both a cooling fluid and a heating fluid are solved numerically with a finite difference method in the case of a uniform flow and no heat resistance in a heat exchanger surface. Temperature distributions in the direction perpendicular to the heat exchanger surface are obtained as well as in the flowing direction. Consequently, effects of flow arrangements (parallel-flow, counter-flow and cross-flow), ratios of fluid capacitance rates and ratios of heat resistances are shown by using a nondimensional duct length X_0 instead of the number of heat transfer units NTU. Here, X_0 has a form in which an overall heat transfer coefficient K in NTU is replaced with a thermal conductivity λ.
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