air flows into a heat engine at ambient conditions (dead state) 100 kPa, 300K in the figure below. Energy is supplied as 1200 k/kg air from a 1500 K source, and in some part of the process a heat-transfer loss of of 300 k)/kg air occurs at 750 K. The air leaves the engine at 100 kPa, 800 as shown K: a 1 a) Find the thermal efficiency of this engine. b) calculate the exergy destruction in this engine Given: air behaves as an idea gas with (Cp -=1 kkg.K Cv =0.717 kJ/kg.K, R=0.287 kJ/kg.K)