# Difference Between Carnot And Rankine Cycle Pdf

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Carnot vs Rankine cycle. Carnot cycle and Rankine cycle are two cycles discussed in thermodynamics.

It is an idealized cycle in which friction losses in each of the four components are neglected. To milk the advantage of higher efficiency Rankine Cycle has to operate on lower condenser pressure usually below atmospheric. And secondly, to study how this performance increase affect in fuel savings and CO2 emissions. The cycle is shown on -, -, and -coordinates in Figure 8. The processes in the Rankine cycle are as follows: : Cold liquid at initial temperature is pressurized reversibly to a high pressure by a … 29 e.

## Vapour cycles

The Carnot cycle was first proposed by a French engineer in and was expanded upon by others in s and s. It is an ideal cycle in which, the working medium receives the heat energy from the high temperatures and rejects the heat at the lower temperature. This cycle laid the foundation for the second law of thermodynamics and introduced the concept of reversibility. Carnot cycle is an excellent yardstick to compare various thermodynamic cycles on theoretical basis. Nevertheless, all practical cycles, differ significantly from Carnot cycle.

The Carnot cycle depends on the temperature of the heat source and heat sink only and is independent of the type of working fluid. The higher the temperature of the heat source the lower the temperature of the heat sink, the more the efficiency. Rankine cycle was described in by the Scottish enigineer William J. M Rankine. The cycle closely describes the process by which steam-operated heat engines commonly found in thermal power generation plants generate power.

Power depends on the temperature difference between a heat source and a cold source. The higher the difference, the more mechanical power can be efficiently extracted out of heat energy. The efficiency of the Rankine cycle is limited by the high heat of vaporization of the working fluid. Also, unless the pressure and temperature reach super critical levels in the steam boiler, the temperature range the cycle can operate over is quite small. In the Rankine cycle, the working substance of the engine undergoes four successive changes that is; heating at constant pressure, converting the liquid to vapour; reversible adiabatic expansion, performing work as by the driving turbine , cooling at constant pressure, condensing the vapour to liquid and reversible adiabatic compression, pumping the liquid back to the boiler.

The processes can be explained as below:. Viva Differences. Carnot cycle is a theoretical cycle. Its efficiency at its highest between two temperature difference. Rankine has a lower efficiency when compared to Carnot cycle, though in real life, Carnot cycle has many advantages than Rankine cycle.

In Carnot cycle, the pressure of working fluid is raised from the condenser pressure to the boiler pressure.

## rankine cycle pdf

Introduction to Thermodynamics pp Cite as. To discuss the two performance criteria used in assessing steam power cycles: thermal efficiency specific work output. To discuss the use of superheating and two-stage expansion as means of improving the Rankine cycle operation. To discuss the characteristics of refrigerants used in the vapour-compression cycle. To discuss the modified vapour-compression and absorption systems used for actual refrigeration.

Rankine cycle is a theoretical cycle in which heat energy converts into work. Rankine cycle or vapor power cycle is the ideal thermodynamic cycle on which most of the thermal power plant works. Gas cycles :- In gas cycles the working fluid is gas. The steps in the Rankine Cycle as shown in Figure 1 and the corresponding steps in the pressure volume diagram figure 2 are outlined below:. It produces only small net power outputs for the plant size because dry saturated steam is used at inlet to the turbine. Rankine cycle for great powers, such as the Rankine cycle with reheat and regenerative Rankine cycle. The purpose of this project has two clear objectives: the first is to determine which parameters affect the cycle performance increase.

The Carnot cycle was first proposed by a French engineer in and was expanded upon by others in s and s. It is an ideal cycle in which, the working medium receives the heat energy from the high temperatures and rejects the heat at the lower temperature. This cycle laid the foundation for the second law of thermodynamics and introduced the concept of reversibility. Carnot cycle is an excellent yardstick to compare various thermodynamic cycles on theoretical basis. Nevertheless, all practical cycles, differ significantly from Carnot cycle. The Carnot cycle depends on the temperature of the heat source and heat sink only and is independent of the type of working fluid.

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## Difference between Carnot Cycle and Rankine Cycle

The basic Rankine cycle We will compare our regenerative cycle to a typical Rankine cycle. The Rankine cycle to which we will compare has the following parameters: The operating limits are heater pressure of 5 MPa heater exit temperature of C cooler pressure of 10 kPa and its efficiencies are Carnot efficiency: For reference, the Rankine cycle layout is shown below. Figure 1: a Rankine cycle. The Rankine Cycle with Rengeration Improving cycle efficiencies Improving cycle efficiency almost always involves making a cycle more like a Carnot cycle operating between the same high and low temperature limits.

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:. High pressure liquid enters the boiler from the feed pump 1 and is heated to the saturation temperature 2. Further addition of energy causes evaporation of the liquid until it is fully converted to saturated steam 3.

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