Steam is produced in the copper tubes (k =223 Btu/h · ft · °F) of a heat exchanger at a temperature of 250°F by another fluid condensing on the outside surfaces of the tubes at 350°F. The inner and outer diameters of the tube are 1 in. and 1.3 in., respectively. When the heat exchanger was new, the rate of heat transfer per foot length of the tube was 2x104 Btu/h. (a) Determine the rate of heat transfer per foot length of the tube when a 0.01-in.-thick a layer of limestone (k =1.7 Btu/h·ft·°F) has formed on the inner surface of the tube after extended use. (b) Assuming that a 0.01-in.-thick limestone layer has formed on both the inner and outer surfaces of the tube
Heat Exchangers
Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.
Heat Exchanger
The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.
Steam is produced in the copper tubes (k =223 Btu/h · ft · °F) of a heat exchanger at a temperature of 250°F by another fluid condensing on the outside surfaces of the tubes at 350°F. The inner and outer diameters of the tube are 1 in. and 1.3 in., respectively. When the heat exchanger was new, the rate of heat transfer per foot length of the tube was 2x104 Btu/h.
(a) Determine the rate of heat transfer per foot length of the tube when a 0.01-in.-thick a layer of limestone (k =1.7 Btu/h·ft·°F) has formed on the inner surface of the tube after extended use.
(b) Assuming that a 0.01-in.-thick limestone layer has formed on both the inner and outer surfaces of the tube
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