Hot (150 to 1008C) and cold (50 to 758C) fluids undergo the
same temperature changes (as indicated in parentheses) in a counterflow
exchanger and a parallelflow exchanger. For the identical temperature changes
and flow rates (same U), the heat transfer surface area required for the
counterflow exchanger compared to that for the parallelflow exchanger is:
(a) 1.00 (b) 1.14 (c) 0.877 (d) 2.00
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