Consider a closed loop heat exchanger that carries exit water (cp = 1 Btu/lbm·°F and r = 62.4 lbm/ft3) of a condenser side initially at 100°F. The water flows through a 500 ft long stainless steel pipe of 1 in inner diameter immersed in a large lake. The temperature of lake water surrounding the heat exchanger is 45°F. The overall heat transfer coefficient of the heat exchanger is estimated to be 250 Btu/h·ft2·°F. What is the exit temperature of the water from the immersed heat exchanger if it flows through the pipe at an average velocity of 9 ft/s? Use «2NTU method for analysis.
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.
Consider a closed loop heat exchanger that carries
exit water (cp = 1 Btu/lbm·°F and r = 62.4 lbm/ft3) of
a condenser side initially at 100°F. The water flows through
a 500 ft long stainless steel pipe of 1 in inner diameter
immersed in a large lake. The temperature of lake water
surrounding the heat exchanger is 45°F. The overall heat
transfer coefficient of the heat exchanger is estimated to be
250 Btu/h·ft2·°F. What is the exit temperature of the water
from the immersed heat exchanger if it flows through the
pipe at an average velocity of 9 ft/s? Use «2NTU method
for analysis.
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