Fundamentals of Heat and Mass Transfer
Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470501979
Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine
Publisher: Wiley, John & Sons, Incorporated
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Chapter 1, Problem 1.39P

A household refrigerator operates with cold- andhot-temperature reservoirs et T c = 5 ° C and T h = 25 ° C , respectively. When new, the cold and hot side resistancesare R c , n = 0.05 K/W and R h , n = 0.04 K/W , respectively.Over time, dust accumulates on the refrigerator’s condenser coil, which is located behind the refrigerator, increasing the hot side resistance to R h , d = 0.1 K/W . It isdesired to have a refrigerator cooling rate of q i n = 750 W .Using the results of Problem 1 .38, determine the modifiedcoefficient of performance and the required power input W ˙ under (a) clean and (b) dusty coil conditions.

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Chapter 1 Solutions

Fundamentals of Heat and Mass Transfer

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