Thermodynamic Cycle


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thermodynamic cycle

[¦thər·mō·dī′nam·ik ′sī·kəl]
(thermodynamics)
A procedure or arrangement in which some material goes through a cyclic process and one form of energy, such as heat at an elevated temperature from combustion of a fuel, is in part converted to another form, such as mechanical energy of a shaft, the remainder being rejected to a lower temperature sink. Also known as heat cycle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Cycle, Thermodynamic

 

a cycle that is completed by a thermodynamic system. The cycles studied in thermodynamics are combinations of various thermodynamic processes, primarily isothermal, adiabatic, isobaric, and isochoric processes.

Figure 1. Thermodynamic cycles in volume (V)-pressure (p) coordinates: (a) the Carnot cycle, (b) the Clapeyron cycle, (c) the Clausius-Rankine cycle

The Carnot cycle (Figure 1, a), the Clapeyron cycle (Figure 1, b), and the Clausius-Rankine cycle (Figure l,c; seeRANKINE CYCLE) are some of the thermodynamic cycles that have played an important role in the evolution of the general principles of thermodynamics and in the development of engineering applications of thermodynamics. Such thermodynamic cycles have been used to study general regularities of the operation of heat engines— that is, internal-and external-combustion engines and turbines— and refrigeration units. (See; STIRLING ENGINE; and WANKEL ENGINE.)

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The driving event in the engine is the thermodynamic cycle, which converts the chemical energy of the fuel into mechanical power.
Simple Thermodynamic Cycle Performance Predictions Refrigerant [DELTA]CAP* [DELTA]COP* Pcond Pevap psia / MPa psia / MPa R-134a 0.0 0.0 173 / 1.19 49.7 / 0.343 R-513A (XP10) +0.004 -0.023 180 / 1.24 54.2 / 0.374 ARM-42a -0.023 -0.023 175 / 1.21 53.6 / 0.370 R-516A (ARM-42) -0.016 -0.021 175 / 1.21 53.5 / 0.369 R-152a -0.052 +0.028 155 / 1.07 44.8 / 0.309 R-1234yf -0.062 -0.047 172 / 1.19 53.1 / 0.366 R-1234ze(E) -0.257 -0.002 131 / 0.90 36.9 / 0.254 Refrigerant [DELTA]CDT [??]L* [degrees]Fd/[degrees]Cd R-134a 0/0 1.00 R-513A (XP10) -10/-5.5 0.94 ARM-42a -12/-6.5 0.89 R-516A (ARM-42) -10/-5.5 0.88 R-152a +20/+11 0.75 R-1234yf -17/-9.5 0.90 R-1234ze(E) -12/-7.0 0.97
[14.] Lu S., Goswami D., "Optimization of a novel combined power/refrigeration thermodynamic cycle." ASME J Sol Energy Eng, 125:212-7, 2003.
Stirling cycle is defined as a ideal reversible thermodynamic cycle with two isothermal process with compression and expansion and two constant volume process with heating and cooling [4].
Rankine cycle (RC) is a thermodynamic cycle that converts thermal energy into mechanical work, which is commonly found in thermal power generation plants.
As a result, the atom is subjected to a thermodynamic cycle. This means that the particle moves back and forth within the trap, thus replicating the stroke of a typical engine.
At our Turbo Expo'14 last June in Dusseldorf, IGTI author Hans Wettstein presented a paper proposing a thermodynamic cycle with a supercharged gas turbine [1], Along with the promise of higher efficiencies over a wide range of loads, supercharging would provide more power to a gas turbine of a given size, just as it does for Diesel and Otto engines.
Coolerado's genesis has its roots in the Cold War-era research of Valeriy Maisotsenko, who discovered a thermodynamic cycle developing cooling systems for tanks in the Ukraine.
The thermal gradient between the waters of the Negro and Solimoes rivers can be harnessed to generate energy with a thermodynamic cycle similar to that used in thermal power plants.