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2300_les22 - VII. Power and Refrigeration Cycles A....

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1 lesson 22 VII. Power and Refrigeration Cycles A. Overview 1. Vapor power cycles - steam power plants and their idealized representation, the Rankine cycle (Sections 10-1 to 10-2) 2. Gas power cycles a. the Carnot cycle b. the spark-ignition, internal combustion engine and its idealized representation, the Otto cycle (Sections 9-1 to 9-5) 3. Refrigeration cycles - the ideal vapor-compression cycle (Sections 11-1 to 11-3) lesson 22 VII. Power and Refrigeration Cycles B. Vapor Power Cycles 1. Introduction a. working fluid is cycled between vapor and liquid state. b. steam is most common working fluid. 2. Carnot vapor cycle is impractical because of low quality of steam in process 3-4 and because of difficulty of pumping two phase mixture in process 1-2. T s 3 4 2 1 Carnot vapor cycle
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2 lesson 22 VII. Power and Refrigeration Cycles 3. The ideal Rankine cycle a. schematic of process Boiler Turbine Pump Condenser out , T W ± out Q ± in Q ± in , P W ± Boundary of system 2 3 4 1 lesson 22 VII. Power and Refrigeration Cycles b. T-s diagram •3-4 isentropic compression in pump, •4-1
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2300_les22 - VII. Power and Refrigeration Cycles A....

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