A 0.25-in.thick steel wall contains 0.125-in. diameter by OJ-in. long copper spines located on 0.37S-in. center-to-center spacing. The spine fins are placed in a square array. The heat transfer coefficient on the side of the wall without fins is 1,000 Btu/hr-ft2-°F. Devise a computer solution to calculate the value of UA for a 1_ft2section of the wall. Tabulate and plot the overall UA versus the fin-side heat transfer coefficient, h. On the same graph plot UA versus h for the wall with no fins. When do fins cause a decrease in the heat transfer rate? Discuss the behavior of the spine fin arrangement as h is varied.
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