Thermodynamic performance optimization of a combined power/cooling cycle

2010 ◽  
Vol 51 (1) ◽  
pp. 204-211 ◽  
Author(s):  
M. Pouraghaie ◽  
K. Atashkari ◽  
S.M. Besarati ◽  
N. Nariman-zadeh
Keyword(s):  
Performance Optimization ◽  
Cooling Cycle ◽  
Thermodynamic Performance

Thermodynamic Performance Optimization of Reciprocating Internal Combustion (IC) Engines

2008 ◽  
Author(s):  
George A. Adebiyi ◽  
Kalyan K. Srinivasan ◽  
Charles M. Gibson
Keyword(s):  
Performance Optimization ◽  
Combustion Process ◽  
Design Parameters ◽  
Second Law ◽  
Ic Engine ◽  
Thermodynamic Performance ◽  
Second Law Analysis ◽  
Compression And Expansion ◽  
Dual Cycle ◽  
Ic Engines

Reciprocating IC engines are traditionally modeled as operating on air standard cycles that approximate indicator diagrams obtained in experiments on real engines. These indicator diagrams can best be approximated by the dual cycle for both gasoline and diesel engines. Analysis of air standard cycles unfortunately fails to capture second law effects such as exergy destruction due to the irreversibility of combustion. Indeed, a complete thermodynamic study of any process requires application of both the first and second laws of thermodynamics. This article gives a combined first and second law analysis of reciprocating IC engines in general with optimization of performance as primary goal. A practical dual-like cycle is assumed for the operation of a typical reciprocating IC engine and process efficiencies are assigned to allow for irreversibilities in the compression and expansion processes. The combustion process is modeled instead of being replaced simply by a heat input process to air as is common in air standard cycle analysis. The study shows that performance of the engine can indeed be optimized on the basis of geometrical design parameters such as the compression ratio as well as the air-fuel ratio used for the combustion.

Thermodynamic performance assessment of a novel air cooling cycle: Maisotsenko cycle

2011 ◽  
Vol 34 (4) ◽  
pp. 980-990 ◽  
Author(s):  
Hakan Caliskan ◽  
Arif Hepbasli ◽  
Ibrahim Dincer ◽  
Valeriy Maisotsenko
Keyword(s):  
Performance Assessment ◽  
Air Cooling ◽  
Cooling Cycle ◽  
Thermodynamic Performance

Thermodynamic efficiency of mesoscopic thermoelectric generators with broken time-reversal symmetry: Insights from an ecological optimization

2020 ◽  
Vol 34 (15) ◽  
pp. 2050262
Author(s):  
Wei Liu ◽  
Long Bai ◽  
Yuehua Wang
Keyword(s):  
Time Reversal ◽  
Performance Optimization ◽  
Figure Of Merit ◽  
Thermodynamic Efficiency ◽  
Time Reversal Symmetry ◽  
Thermoelectric Generators ◽  
Thermoelectric Figure ◽  
Thermodynamic Performance ◽  
Number Formula ◽  
Ecological Optimization

We study the performance optimization for mesoscopic thermoelectric generators (MTGs) with broken time-reversal symmetry by using an ecological criterion, and some specific properties of the thermoelectric system are further revealed. We discuss the working regimes of time-reversal symmetric mesoscopic (macroscopic) thermoelectric generators, and find that a larger thermodynamic efficiency can be obtained only when the Wiedemann–Franz (WF) law is strongly violated. Furthermore, a definite dependence of the optimal bound efficiency (power) on the asymmetry parameter and the generalized thermoelectric figure of merit is analytically determined, and it is found that the usual value [Formula: see text] can be readily overcome. A larger efficiency can be obtained with the further enhancement of broken time-reversal symmetry, although the power output does not synchronize with efficiency. Interestingly, both the increase of the number [Formula: see text] of terminals and the external magnetic field open up the possibility to physically enhance the performance of thermoelectric generators, and the underlying physical origin of the improved energy conversion is also provided. The obtained results can contribute to a profound insight of thermodynamic performance for MTGs.

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