A heat exchanger that is used for cooling lubricating oil is comprised of a thin-walled inner tube of 30 mm diameter carrying water and an outer tube of 50 mm diameter carrying the oil. The exchanger operates in counterflow mode with an overall heat transfer coefficient of 65 W/m2 K and the tabulated average properties are given. (a) If the outlet temperature of the oil is 60°C, determine the total heat transfer and the outlet temperature of the water. (b) How long must the tube be made if the outlet temperature of the oil is 60°C? (c) Explain and discuss with the use of diagrams the difference between parallel and counter flow heat exchangers? (d)If the heat exchanger is changed to a 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.
Task 2
A heat exchanger that is used for cooling lubricating oil is comprised of a thin-walled inner tube of 30
mm diameter carrying water and an outer tube of 50 mm diameter carrying the oil. The exchanger
operates in counterflow mode with an overall heat transfer coefficient of 65 W/m2 K and the tabulated
average properties are given.
(a) If the outlet temperature of the oil is 60°C, determine the total heat transfer and the outlet
temperature of the water.
(b) How long must the tube be made if the outlet temperature of the oil is 60°C?
(c) Explain and discuss with the use of diagrams the difference between parallel and counter flow heat
exchangers?
(d)If the heat exchanger is changed to a 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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