A counter flow double pipe heat exchanger is tested for the pre-heating of feed water at 30oC using superheated steam at a temperature of 250oC. The superheated steam experiences a temperature drop of 70oC as it exits the heat exchanger. The water to be heated flows through the heat exchanger tube of negligible thickness at a constant rate of 3.47 kg/s. The convective heat transfer coefficients on the superheated steam and water sides are 850 W/m2·K and 1250 W/m2·K, respectively. To account for fouling due to chemical impurities that might be present in the feed water, use an appropriate fouling factor for the water side. Determine(a) the heat exchanger area required to maintain the exit temperature of the water at a minimum of 70oC, (for counter current flow).
(b) the mass flowrate of steam into the condenser,
(c) what would be the required heat exchanger area in the case of a parallel flow arrangement?
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