A cross-flow air-to-water heat exchanger with an effectiveness of 0.65 is used to heat water (cp = 4180 J/kg·K) with hot air (cp = 1010 J/kg·K). Water enters the heat exchanger at 20°C at a rate of 4 kg/s, while air enters at 100°C at a rate of 9 kg/s. If the overall heat transfer coefficient based on the water side is 260 W/m2·K, determine the heat transfer surface area of the heat exchanger on the water side. Assume both fluids are unmixed.
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 cross-flow air-to-water heat exchanger with an
effectiveness of 0.65 is used to heat water (cp = 4180 J/kg·K)
with hot air (cp = 1010 J/kg·K). Water enters the heat exchanger
at 20°C at a rate of 4 kg/s, while air enters at 100°C at a rate
of 9 kg/s. If the overall heat transfer coefficient based on the
water side is 260 W/m2·K, determine the heat transfer surface
area of the heat exchanger on the water side. Assume both
fluids are unmixed.
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