A thin-walled double-pipe, counter-flow heat exchanger is to be used to cool oil (cp = 0.525 Btu/lbm·°F) from 300°F to 105°F at a rate of 5 lbm/s by water (cp = 1.0 Btu/lbm·°F) that enters at 70°F at a rate of 3 lbm/s. The diameter of the tube is 5 in and its length is 200 ft. Determine the overall heat transfer coefficient of this heat exchanger using (a) the LMTD method and (b) the «-NTU method.
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 thin-walled double-pipe, counter-flow heat
exchanger is to be used to cool oil (cp = 0.525 Btu/lbm·°F)
from 300°F to 105°F at a rate of 5 lbm/s by water (cp =
1.0 Btu/lbm·°F) that enters at 70°F at a rate of 3 lbm/s. The
diameter of the tube is 5 in and its length is 200 ft. Determine
the overall heat transfer coefficient of this heat exchanger
using (a) the LMTD method and (b) the «-NTU method.
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