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Wk_11_Recitation - exhaust gases to a temperature of 500°C...

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Recitation 11/19/04 Bullets Combined cycle Topping cycle and bottoming cycle Waste heat Equations of state – virial equation, Van der Waals equation Exact differential, reciprocity relation, cyclic relation Helmholtz and Gibbs functions Gibbs relations Maxwell relations 1. Consider a combined gas-steam power cycle. The topping cycle is a gas-turbine cycle that has a pressure ratio of 8. Air enters the compressor at 300 K and the turbine at 1300 K. The isentropic efficiency of the compressor is 80 percent, and that of the gas turbine is 85 percent. The bottoming cycle is a simple ideal Rankine cycle operating between the pressure limits of 7 MPa and 5kPa. Steam is heated in a heat exchanger by the gas turbine
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Unformatted text preview: exhaust gases to a temperature of 500°C. The exhaust gases leave the heat exchanger at 450 K. Draw the two cycles on the same T-S diagram. Determine (a) the ratio of the mass flow rates of the steam and the combustion gases and (b) the thermal efficiency of the combined cycle. 2. One kmol of argon at 300 K is initially confined to one side of a rigid, insulated container divided into equal volumes of 0.2 m 3 by a partition. The other side is initially evacuated. The partition is removed and the argon expands to fill the entire container. Using the van der Waals equation of state, determine the final temperature of the argon, in K. Repeat using the ideal gas equation of state....
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