ECOLOGICAL OPTIMIZATION OF AN IRREVERSIBLE OTTO CYCLE WITH VARIABLE SPECIFIC HEATS OF WORKING FLUID

2017 ◽  
Author(s):  
Yanlin Ge ◽  
Lingen Chen ◽  
Xiaoyong Qin ◽  
Zhihui Xie
Keyword(s):  
Working Fluid ◽  
Otto Cycle ◽  
Specific Heats ◽  
Ecological Optimization

Ecological Optimization Performance of An Irreversible Quantum Otto Cycle Working with an Ideal Fermi Gas

2006 ◽  
Vol 13 (01) ◽  
pp. 55-66 ◽  
Author(s):  
Feng Wu ◽  
Lingen Chen ◽  
Fengrui Sun ◽  
Chih Wu ◽  
Fangzhong Guo ◽  
...  
Keyword(s):  
Equation Of State ◽  
Entropy Production ◽  
Fermi Gas ◽  
Optimization Criterion ◽  
Exergy Loss ◽  
Working Fluid ◽  
Otto Cycle ◽  
Special Cases ◽  
The Relationship ◽  
Ecological Optimization

The model of an irreversible Otto cycle using an ideal Fermi gas as the working fluid, which is called as the irreversible Fermi Otto cycle, is established in this paper. Based on the equation of state of an ideal Fermi gas, the ecological optimization performance of an irreversible Fermi Otto cycle is examined by taking an ecological optimization criterion as the objective, which consists of maximizing a function representing the best compromise between the exergy output and exergy loss (entropy production) of the cycle. The relationship between the ecological function E and the efficiency η is studied. Three special cases are discussed in detail. The results obtained herein may reveal the general performance characteristics of the irreversible Fermi Otto cycle.

The effects of variable specific heats of working fluid on the performance of an irreversible Otto cycle

2005 ◽  
Vol 2 (3) ◽  
pp. 274 ◽  
Author(s):  
Yanlin Ge ◽  
Lingen Chen ◽  
Fengrui Sun ◽  
Chih Wu
Keyword(s):  
Working Fluid ◽  
Otto Cycle ◽  
Specific Heats

Ecological Optimization of an Irreversible Otto Cycle

2012 ◽  
Vol 38 (2) ◽  
pp. 373-381 ◽  
Author(s):  
Yanlin Ge ◽  
Lingen Chen ◽  
Fengrui Sun
Keyword(s):  
Otto Cycle ◽  
Ecological Optimization

Performance Analysis of Diesel Cycle under Efficient Power Density Condition with Variable Specific Heat of Working Fluid

2019 ◽  
Vol 44 (4) ◽  
pp. 405-416 ◽  
Author(s):  
Roshan Raman ◽  
Naveen Kumar
Keyword(s):  
Power Density ◽  
Engine Performance ◽  
Performance Criterion ◽  
Maximum Power ◽  
Performance Criteria ◽  
Working Fluid ◽  
Specific Heats ◽  
Harmful Emissions ◽  
Diesel Cycle ◽  
Efficient Power

Abstract A novel realistic Work Criteria Function (WCF) approach has been used to analyze the ideal air-standard Diesel cycle. The WCF formulation gives rise to a new performance criterion which is termed as efficient power density (EPD). Thermodynamic analysis under maximum efficient power density (MEPD) conditions has been performed and compared with other available performance criteria using variable specific heats of the working fluid. The results obtained from this analysis prove that the engine designed under MEPD conditions is very efficient and the size of the engine is reduced significantly compared to those designed under maximum efficient power (MEP), maximum power density (MPD), and maximum power (MP) criteria. Harmful emissions like {\mathrm{NO}_{\mathrm{x}}} may decrease considerably at higher values of the maximum cycle temperature ratio (ξ). The effect of variable specific heats of operational fluid on the actual cycle’s performance has a significant impact on engine performance and should be incorporated when evaluating practical cycle engines. The results obtained in the current study have scientific importance and could be an essential guide for the design of real Diesel engines by engine manufacturers.

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