Water (cp = 1.0 Btu/lbm ℉) is to be heated by solar heated hot air (cp = 0.24 Btu/lbm ℉) in a double-pipe counterflow heat exchanger. Air enters the heat exchanger at 190℉ at a rate of 0.7 lbm/s and leaves at 135℉. Water enters at 70℉ at a rate of 0.35 lbm/s. The overall heat transfer coefficient based on the inner side of the tube is given to be 20 Btu/h ft2 ℉). Determine the length of the tube required for a tube internal diameter of 0.5 in. (Answer: 162.0 ft)
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.
Water (cp = 1.0 Btu/lbm ℉) is to be heated by solar heated hot air (cp = 0.24 Btu/lbm ℉) in
a double-pipe counterflow heat exchanger. Air enters the heat exchanger at 190℉ at a rate of
0.7 lbm/s and leaves at 135℉. Water enters at 70℉ at a rate of 0.35 lbm/s. The overall heat
transfer coefficient based on the inner side of the tube is given to be 20 Btu/h ft2 ℉). Determine
the length of the tube required for a tube internal diameter of 0.5 in. (Answer: 162.0 ft)
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