1. A double-pipe parallel-flow heat exchanger is used to heat cold tap water with hot water. Hot water (Cp = 4.25 kJ/kg. K) Enters the tube at 85°C at a rate of 1.4 kg/s and leaves at 50 °C The heat exchanger is not well insulated, and it is estimated that 3 percent of the heat given up by the hot fluid is lost from the heat exchanger. If the overall heat transfer coefficient and the surface area of the heat exchanger are 1150 W/m2K and 4 m2, respectively, determine the rate of heat transfer to the cold water and the log mean temperature difference for this heat exchanger.
1. A double-pipe parallel-flow heat exchanger is used to heat cold tap water with hot water. Hot water (Cp = 4.25 kJ/kg. K) Enters the tube at 85°C at a rate of 1.4 kg/s and leaves at 50 °C The heat exchanger is not well insulated, and it is estimated that 3 percent of the heat given up by the hot fluid is lost from the heat exchanger. If the overall heat transfer coefficient and the surface area of the heat exchanger are 1150 W/m2K and 4 m2, respectively, determine the rate of heat transfer to the cold water and the log mean temperature difference for this heat exchanger.
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter5: Analysis Of Convection Heat Transfer
Section: Chapter Questions
Problem 5.41P
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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.
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1. A double-pipe parallel-flow heat exchanger is used to heat cold tap water with hot water. Hot water (Cp = 4.25 kJ/kg. K) Enters the tube at 85°C at a rate of 1.4 kg/s and leaves at 50 °C The heat exchanger is not well insulated, and it is estimated that 3 percent of the heat given up by the hot fluid is lost from the heat exchanger. If the overall heat transfer coefficient and the surface area of the heat exchanger are 1150 W/m2K and 4 m2, respectively, determine the rate of heat transfer to the cold water and the log mean temperature difference for this heat exchanger.
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