Vapor Cycle Exergy Analysis The steam generator of a vapor power plant can be...

Vapor Cycle Exergy Analysis

The steam generator of a vapor power plant can be considered for simplicity to consist of a combustor unit in which fuel and air are burned to produce hot combustion gases, followed by a heat exchanger unit where the cycle working fluid is vaporized and superheated as the hot gases cool. Consider water as the working fluid undergoing the cycle of Problem 8.17. Hot combustion gases, which are assumed to have the properties of air, enter the heat exchanger portion of the steam generator at 1200 K and exit at 600 K with a negligible change in pressure. Determine for the heat exchanger unit

(a) the net exergy carried in by the gas stream, in kJ per kg of steam flowing.

(b) the net exergy carried out by the water stream, in kJ per kg of steam flowing.

(c) the rate of exergy destruction, in kW.

(d) the exergetic efficiency given by Eq. 7.27. Let T₀ = 15^oC, p₀ = 0.1 MPa.