Rankine Cycle Pv And Ts Diagram Pdf

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When plotted on a pressure volume diagram , the isobaric processes follow the isobaric lines for the gas the horizontal lines , adiabatic processes move between these horizontal lines and the area bounded by the complete cycle path represents the total work that can be done during one cycle.

The Rankine cycle is a model used to predict the performance of steam turbine systems. It was also used to study the performance of reciprocating steam engines. The Rankine cycle is an idealized thermodynamic cycle of a heat engine that converts heat into mechanical work while undergoing phase change. It is an idealized cycle in which friction losses in each of the four components are neglected.

Rankine Cycle – pV, Ts diagram

The Rankine cycle is a modified form of Carnot cycle, in which the isothermal compression is continued unit the steam is condensed into water. A Carnot cycle, using steam as a working substance, is represented or p-v and t-s diagram as shown in the figure. Consider 1kg of water at pressure P1 and absolute temperature T1 as represented by point 1 in the figure. The cycle is completed by the following four processes. The water is isothermally converted into dry saturated steam at a constant temperature T1 and pressure P1.

Rankine cycle

This improves the efficiency of the cycle, as more of the heat flow into the cycle occurs at higher temperature. Save my name, email, and website in this browser for the next time I comment. Its pressure also rises from P4 to P1. By superheating, state 3 will move to the right and up in the diagram and hence produce a drier steam after expansion. The problems with the Carnot Cycle are as follows. The cold source the colder the better used in these power plants are usually cooling towers and a large water body river or sea. In the Reheat cycle, the steam is extracted at a point when it becomes just wet, from the turbine, and is reheated with the help of flue gases from the boiler furnace.

Thermodynamic cycles can be divided into two general categories: power cycles, which produce a net power output, and refrigeration and heat pump cycles, which consume a net power input. The thermodynamic power cycles can be categorized as gas cycles and vapor cycles. In gas cycles, the working fluid remains in the gas phase throughout the entire cycle. In vapor cycles, the working fluid exits as vapor phase during one part of the cycle and as liquid phase during another part of the cycle. Steam power plants run vapor power cycles with water as the working fluid. This section introduces the ideal cycle for vapor power cycle - Rankine cycle.

(a) schematic representation of a reheat Rankine cycle (b) T-s diagram of a reheat Rankine cycle Air standard Otto cycle on (a) P-v diagram (b) T-s diagram.

Explain Rankine cycle with the help of P-V T-s and H-s diagrams.

The Rankine cycle is the fundamental operating cycle of all power plants where an operating fluid is continuously evaporated and condensed. The selection of operating fluid depends mainly on the available temperature range. The Rankine cycle operates in the following steps:.

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These shortcomings inherent in a steam power plant realizing the Carnot cycle with wet steam can be partly remedied if heat is rejected from the wet steam in the condenser before the entire steam condenses. Its compressibility is also negligible compared with that of wet steam. Water is displaced from the condenser into the boiler and its pressure is simultaneously increased not with the aid of compressors but pumps of compact design, simple arrangement and actuated by a rather low-power drive.

Application of the First law of thermodynamics to the control volume pump, steam generator, turbine and condenser , gives. The thermal efficiency of the Rankine cycle is given by,.

Rankine Cycle: Processes with P-v and T-s Diagram

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Rankine Cycle – pV, Ts diagram

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2 Response
  1. Fmawteveli

    1: T-s diagram for two Carnot vapor cycle. Other issues The Rankine cycle is the ideal cycle for vapor power plants; it includes the following four reversible Pv w. P. Pv w mmy w wy w h hy h h w h hy q h h q. PumpII. PumpI. PumpII. PumpI in.

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