Find the duty of this heat exhanger when new: Q6: Say we have a heat exchanger made to heat 150 liters/minute from 20 degrees celsius to 80 degrees celsius. Each section of the heat exchanger, which is a circular pipe, is 10m long. The outer diameter is 2in, and the thickness of the pipe is 1 / 8 inch. As the heat exchanger is operated, lime is built up known as fouling. The heat exahnger uses N number of pipes, where water passes through the pipe and hot gas is on the outside. k(foul) = 0.5 W/mK, K(foul) increases at 1mm/year, however there is no lime build up initially because the heat exchanger is new. Steel thermal conductivity is k(steel) = 50 W/mK while the convection coefficient between the water in the tube and the inside wall of the pipe is 1000 W/m^2K, and the convection coefficient of the outside pipe and hot gas is 100 W/m^2K.
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.
Find the duty of this heat exhanger when new:
Q6: Say we have a heat exchanger made to heat 150 liters/minute from 20 degrees celsius to 80 degrees celsius. Each section of the heat exchanger, which is a circular pipe, is 10m long. The outer diameter is 2in, and the thickness of the pipe is 1 / 8 inch. As the heat exchanger is operated, lime is built up known as fouling. The heat exahnger uses N number of pipes, where water passes through the pipe and hot gas is on the outside.
k(foul) = 0.5 W/mK, K(foul) increases at 1mm/year, however there is no lime build up initially because the heat exchanger is new.
Steel thermal conductivity is k(steel) = 50 W/mK while the convection coefficient between the water in the tube and the inside wall of the pipe is 1000 W/m^2K, and the convection coefficient of the outside pipe and hot gas is 100 W/m^2K.
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