rankine cycle

rankine cycle - A Vapor Power Cycle T 2 3 4 1 P v 1 2 3 4...

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Unformatted text preview: A Vapor Power Cycle T 2 3 4 1 P v 1 2 3 4 Boiler Turbine Compressor (pump) Heat exchanger 1 2 3 4 Q out Q in W out W in Optimization of a Vapor Power Plant • Objectives: design an optimal vapor power cycle – use idealized Carnot cycle as the model; – consider all theoretical and practical limitations and redesign the cycle accordingly ! Idealized Rankine cycle; – optimize the Rankine cycle using concepts of superheating, reheating and regeneration; – discussion concerning the increase of the efficiency of an idealized Rankine cycle. Carnot cycle T s 2 3 4 1 OR T 2 3 4 1 (a) (b) s Practical Problems associated with Carnot Cycle Plant • Maximum temperature limitation for cycle (a). What is the maximum temperature in the cycle? • Isentropic expansion in a turbine from 3-4. What is the quality of the steam inside the turbine? Will high moisture content affect the operation of the turbine? • Isentropic compression process in a pump from 1-2. Can one design a condenser and transmission line system that precisely control the quality of the vapor in order to achieve an isentropic compression? Even we can, is it practical to handle two-phase flow (liquid + vapor) using such a system? • The latter two problems can be resolved by the use of cycle (b) from previous slide. However, the (b) cycle requires the compression(1-2)of liquid at a very high pressure (exceeding 22 MPa for a steam, how do I get this number from?) and that is not practical. Also, to maintain a constant temperature above the critical temperature is also difficult since the pressure will have to change continuously. How about a modified cycle - A Rankine cycle • To avoid transporting and compressing two-phase fluid, we can try to condense all fluid exiting from the turbine into saturated liquid before compressed it by a pump....
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This note was uploaded on 11/27/2011 for the course EML 3002c taught by Professor Staff during the Fall '08 term at FSU.

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rankine cycle - A Vapor Power Cycle T 2 3 4 1 P v 1 2 3 4...

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