Question

Hot exhaust gases which enters a finned
tube cross flow heat exchanger at 300°C and
leave at 100°C. are used to heat pressurized
water at a flow rate of 1 kg/s from 35 to
125°C. The exhaust gas specific heat is
approximately 1000 J/kg.K, and the overall
heat transfer coefficient based on the gas
side surface area is Uh = 100 W/m2K.
Determine the required gas side surface area
Ah using the NTU method. Take Cp, c at
T =80°C is 4197 J/kg.K. and Cp,
h = 1000 J/kg.K.
​

Answer 1

Answer:

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Explanation:

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h8= 275 kJ/kg

Hot exhaust gases, which enters a finned-tube, cross-flow heat exchanger at 300°C and leave at 100°C, are used to heat pressurized water at a flow rate of 1 kg/s from 35 °C to 125 °C. The overall heat transfer coefficient based on the gas-side surface is h U =100 W/m2. K.