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Cycle

Thermodynamic cycles describe the ideal processes that working fluids undergo in thermal systems. There are several types of cycles, including the Otto, Diesel, Dual, Carnot, Rankine, and Brayton cycles. The first three are related to internal combustion engines while the last three are used to analyze power plants. The Rankine cycle models steam power plants, involving isentropic compression, constant pressure heating, isentropic expansion, and constant pressure heat rejection. The Brayton cycle describes gas turbine engines through isentropic compression, constant pressure heating, isentropic expansion, and constant pressure heat rejection. Thermodynamic cycles help evaluate thermal processes.

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Mohamed Naser
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94 views6 pages

Cycle

Thermodynamic cycles describe the ideal processes that working fluids undergo in thermal systems. There are several types of cycles, including the Otto, Diesel, Dual, Carnot, Rankine, and Brayton cycles. The first three are related to internal combustion engines while the last three are used to analyze power plants. The Rankine cycle models steam power plants, involving isentropic compression, constant pressure heating, isentropic expansion, and constant pressure heat rejection. The Brayton cycle describes gas turbine engines through isentropic compression, constant pressure heating, isentropic expansion, and constant pressure heat rejection. Thermodynamic cycles help evaluate thermal processes.

Uploaded by

Mohamed Naser
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Working cycles

In any thermal process, the The 1st three cycles are


working fluid undergoes a series related mostly to internal
of events ideally continuous & reversible
that forms a repetitive cycle, and combustion engines, while
therefore such cycle can help the last three cycles are to
evaluating the process in various be used in power plant
aspects.
thermodynamic analysis.
Thermodynamic cycles are of
many types, such as for example :
1. Otto cycle
2. Diesel cycle
3. Dual cycle
4. Carnot cycle
5. Rankine cycle
6. Brayton cycle
Carnot cycle
Carnot cycle is the most
efficient cycle that can be
executed between a heat
source and a heat sink.
it is an ideal cycle which
consists of four reversible
processes, i.e. two
frictionless isothermal and
two frictionless adiabatic
processes. The cycle is
shown on this P-V
diagram.
TL
= 1-
TH
Rankine cycle
A Rankine cycle describes a model of steam-
operated heat engine most commonly found
in power generation plants. Common heat
sources for power plants using the Rankine
cycle are the combustion of coal, natural gas
and oil, and nuclear fission
Process 1-2 isentropic compression: The
working fluid is pumped from low to high
pressure.
Process 2-3isobaric heat supply: The high
pressure liquid enters a boiler where it is
heated at constant pressure by an external
heat source to become a dry saturated vapor.
Process 3-4isentropic expansion: The dry
saturated vapor expands through a turbine,
generating power. This decreases the
temperature and pressure of the vapor, and
some condensation may occur.
Process 4-1isobaric heat rejection: The wet
vapor then enters a condenser where it is
condensed at a constant pressure to become a
saturated liquid.
Brayton cycle
The Brayton cycle is a
thermodynamic cycle that describes
the workings of the gas turbine
engine,
Brayton cycle is made up of the
following four internally reversible
processes:
Isentropic compression (in a
compressor)
Constant pressure heat addition
Isentropic expansion (in a
turbine)
Constant pressure heat rejection
Working cycles related to
power plant
Steam power Rankine cycle
plant
Brayton cycle
Gas turbine

Otto diesel dual


I C Engines cycles
Classification of
power plant cycles
Vapor Gas power
power cycle cycle

carnot otto

rankine diesel

Binary
(gas +
dual
steam)

brayton

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