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