recitation11 - Recition 11 Solution November 19, 2004 1...

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Recition 11 Solution November 19, 2004 1 Problem 1 Known Combined gas-steam power cycle. Refer to the bold items in table-1 for known states. In addition: p 2 /p 1 = 8 , η c = 80% , η t = 85% Find T-s diagram for the two cycles on the same diagram and ˙ m v / ˙ m g , η . Schematic and given data Assumptions 1. Air is ideal gas but without constant speciFc heats. 2. Negnate kinetic and potential energy e±ects. 1
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Analysis state T s(kJ/kg · K) p(kPa) h(kJ/kg) 1 300K ent7 p 1 310.24 2s 540K ent12 8 p 1 544.35 2 595K ent17 8 p 1 602.88 3 1300K ent22 8 p 1 1395.97 4s 770K ent27 p 1 789.11 4 853K ent32 p 1 880.12 5 450K s 5 p 1 451.80 6 33 C 0.4718 7000 144.85 7 500 C 6.8016 7000 3410.1 8 32.56 C 6.8016 5 2071.2 9 32.56 C 0.4718 5 136.5 Table 1: Properties for all states. ˙ m v ( h 7 - h 6 ) = ˙ m g ( h 4 - h 5 ) , (1) η = ˙ W g + ˙ W v ˙ Q in . (2) To solve to problem, we need to Fll out table-1 Frst, especially the h column for the last two questiones and T and s column for the T-s diagram. We solve for the two cycles separately. In order to solve each cycle, we need their own T-s diagrams Frst, which are readily given by the book.
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recitation11 - Recition 11 Solution November 19, 2004 1...

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