A counterflow, concentric tube heat exchanger is used to cool the lubricating oil for a large industrial gas turbine engine. The flow rate of cooling water through the inner tube (Di = 20 mm) is 0.5 kg/s, while the flow rate of oil through the outer tube (Do = 45 mm) is 0.3 kg/s. The oil and water enter at temperatures of 100 and 30°C, respectively. Given the Cp for water is 4200 J/kg.k and Cp for the oil is 1900 J/kg.k. In addition, the convection coefficient of heat transfer for the water is 1500 W/m2 and the convection coefficient of heat transfer for the oil is 300 W/m2 A) What is the main difference between parallel and counter flow heat exchangers? B) How long must the tube be made if the outlet temperature of the oil is 60°C? C) If the heat exchanger is changed to parallel flow heat exchanger, how long must the tube be made if the outlet temperature of the oil is 60°C?
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.
A counterflow, concentric tube heat exchanger is used to cool the lubricating oil for a large
industrial gas turbine engine. The flow rate of cooling water through the inner tube (Di = 20
mm) is 0.5 kg/s, while the flow rate of oil through the outer tube (Do = 45 mm) is 0.3 kg/s.
The oil and water enter at temperatures of 100 and 30°C, respectively. Given the Cp for
water is 4200 J/kg.k and Cp for the oil is 1900 J/kg.k. In addition, the convection coefficient
of heat transfer for the water is 1500 W/m2 and the convection coefficient of heat transfer for the oil is 300 W/m2
A) What is the main difference between parallel and counter flow heat exchangers?
B) How long must the tube be made if the outlet temperature of the oil is 60°C?
C) If the heat exchanger is changed to parallel flow heat exchanger, how long must
the tube be made if the outlet temperature of the oil is 60°C?
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