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ε-NTU-ω RELATIONSHIPS FOR INVERTED ORDER FLOW ARRANGEMENTS OF TWO-PASS CROSSFLOW HEAT EXCHANGERS

ABSTRACT
A review of the effectiveness (ε) — number of transfer units (NTU) — capacity rate ration (ω) relationships for eighteen possible inverted order flow arrangements of two-pass crossflow heat exchangers is presented. The exact closed form solutions to the arrangements with unmixed-unmixed passes are given for the first time. When one fluid is mixed between the passes, the exact explicit formulas for the mean mixed fluid temperatures int he interpasses are given as well. The new relations are particularly helpful for computer-aid-ε-NTU-ω charts for each arrangement are also provided to facilitate hand calculations.
PUBLISHED ONLINE: 2020-09-27
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THERMAL SCIENCE YEAR 1997, VOLUME 1, ISSUE Issue 1, PAGES [7 - 28]
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© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence