10-87 Show that the thermal efficiency of a combined gas-steam power plant hcc can be expressed as hcc = hg + hs - hghs where hg = Wg/Qin and hs = Ws/Qg,out are the thermal efficiencies of the gas and steam cycles, respectively. Using this relation, determine the thermal efficiency of a combined power cycle that consists of a topping gas-turbine cycle with an efficiency of 40 percent and a bottoming steam-turbine cycle with an efficiency of 30 percent. | |
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