Engineering, 09.10.2019 01:10 klk597703
The hot water pipe leaving a residential water heater is not insulated. the water flowing inside is maintained at 49 °c and has a convection coefficient of 234 w/m2 *k. the inside diameter of the copper (400 w/m*k) pipe is 0.745 inches; the wall thickness is 0.065 inches. the temperature and the convection coefficient of the air surrounding the pipe are 15 °c and 16 w/m2 *k respectively. determine the heat loss per unit length of uninsulated pipe, and the temperature of the outer surface. determine the heat loss and the outermost surface temperature for the same conditions with the pipe insulated using 3/8"-thick insulation whose thermal conductivity is 0.034 w/m*k. do the surface temperatures of the copper pipe change with the addition of insulation?
Answers: 1
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Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]
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The hot water pipe leaving a residential water heater is not insulated. the water flowing inside is...
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