An oil cooler is used to cool lubricating oil from 70oC to 40oC. The cooling water enters the heat exchanger at 15oC and leaves at 25oC. The specific heat capacities of the oil and water are 2000 and 4200 J/Kg.K respectively, and the oil flow rate is 4 Kg/s. Calculate the water flow rate required. Calculate the true mean temperature difference for (two-shell-pass / four-tube-pass) and (one-shell-pass / two-tube-pass) heat exchangers respectively. Find the effectiveness of the heat exchangers.
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.
An oil cooler is used to cool lubricating oil from 70oC to 40oC. The cooling water enters the heat exchanger at 15oC and leaves at 25oC. The specific heat capacities of the oil and water are 2000 and 4200 J/Kg.K respectively, and the oil flow rate is 4 Kg/s.
- Calculate the water flow rate required.
- Calculate the true mean temperature difference for (two-shell-pass / four-tube-pass) and (one-shell-pass / two-tube-pass) heat exchangers respectively.
- Find the effectiveness of the heat exchangers.
Given
Oil temperatures
T1 = 70oC
T2 = 40oC
Specific heat capacity of the oil = 2000 J/Kg.K
oil flow rate =4 Kg/s.
Water temperatures
t1 = 15oC
t2 = 25oC
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