A thermally isolated system at constant pressure consists of \(10 \mathrm{~kg}\) of air at a temperature of \(1000 \mathrm{~K}\) and \(10 \mathrm{~kg}\) of water at \(300 \mathrm{~K}\), connected together by a heat engine. What would be the equilibrium temperature of the system if the maximum thermal efficiency of the engine is only \(50 \%\) ?

Assume

[385.1 K]

Transcribed Image Text:

for water c = 4.2 kJ/kg K; K = cp/cy= 1.0; for air: Cy = 0.7 kJ/kg K; K = Cp/Cy = 1.4.