6-17 A steam power plant receives heat from a furnace at a rate of 280 GJh. Heat losses to the surrounding air from the steam as it passes through the

pipes and other components are estimated to be about 8 GJ/h. If the waste heat is transferred to the cooling water at a rate of 165 GJh, determine (a) et power output and (b) the thermal efficiency of this power plant. Answers: (a) 20.7 MW, (bj 38.2 percent