A single-pass, cross-flow heat exchanger with both fluids

Chapter , Problem 11.55

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QUESTION:

A single-pass, cross-flow heat exchanger with both fluids unmixed is being used to heat water (m . c 2 kg /s, cp 4200 J/kg K) from 20C to 100C with hot exhaust gases (cp 1200 J/kg K) entering at 320C. What mass flow rate of exhaust gases is required? Assume that UA is equal to its design value of 4700 W/K, independent of the gas mass flow rate. 1

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QUESTION:

A single-pass, cross-flow heat exchanger with both fluids unmixed is being used to heat water (m . c 2 kg /s, cp 4200 J/kg K) from 20C to 100C with hot exhaust gases (cp 1200 J/kg K) entering at 320C. What mass flow rate of exhaust gases is required? Assume that UA is equal to its design value of 4700 W/K, independent of the gas mass flow rate. 1

ANSWER:


The mass flow r

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