a certain water heater operates under steady flow conditions receiving 4.2 kg/s of water at 75 c temperature, enthalpy 313.93 kj/kg. the water is heated by mixing with steam which is supplied to the heater at temperature 100.2 c and enthalpy 2676 kj/kg. the mixture leaves the heater as liquid water at temperature 100c and enthalpy 419 kj/kg. how much steam must be supplied to the heater per hour?
solution by mass balance across the control surface