Results 251 to 260 of about 2,792,267 (292)

A numerical investigation of the entropy generation in and thermodynamic optimization of a combustion chamber

Energy, 2015
Abstract In this study, we are simulating the turbulent combustion of a mixed bluff-body swirl stabilized flame in a gas turbine combustion chamber and investigating the effects of different parameters, including the swirl number, distance between the air and fuel nozzle which is called bluff size, equivalence ratio, inlet fuel flow rate, and the ...
H.R. Arjmandi, E. Amani
openaire   +1 more source

Applicability of the minimum entropy generation method for optimizing thermodynamic cycles

Chinese Physics B, 2013
Entropy generation is often used as a figure of merit in thermodynamic cycle optimizations. In this paper, it is shown that the applicability of the minimum entropy generation method to optimizing output power is conditional. The minimum entropy generation rate and the minimum entropy generation number do not correspond to the maximum output power when
Xue-Tao Cheng, Xin-Gang Liang
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Thermodynamic optimizing of pressure-retarded osmosis power generation systems

Journal of Membrane Science, 1999
A transport equation for a solution flow increasing due to osmosis inside a hollow cylindrical fibre is derived. The equation can be applied for either direct, pressure-retarded or reverse osmosis, when the membrane is highly selective. This transport equation is used to study theoretically the net power delivered, and the entropy generated by two ...
Ari Seppälä, Markku J. Lampinen
openaire   +1 more source

Thermodynamic optimization method of regenerator of gas turbine with entropy generation

Journal of Heat Recovery Systems, 1986
Abstract In the design of the heat exchangers, the enhancement of heat transfer suraace area is effective to reduce the loss due to the fluid-to-fluid temperature difference. It, however, leads to the increase of the pressure loss in the channel. The optimum working condition must be determined by taking these trade of conditions into account.
Y. Tsujikawa, T. Sawada, T. Morimoto, K. Murata   +3 more
openaire   +1 more source

Geometric and Thermodynamic Optimization of a Heat Recovery Steam Generator: A Constructal Design

Journal of Heat Transfer, 2012
Heat recovery steam generator (HRSG) is a critically important subsystem of a combined cycle. The global objective of a HRSG is to heat the stream of water. The HRSG is composed of three major sections, including an economizer, an evaporator, and a superheater. In this study, a water tube HRSG is considered and its main design features are deduced from
E. Norouzi, M. Mehrgoo, M. Amidpour
openaire   +1 more source

Thermodynamic analysis and optimization of a flash-binary geothermal power generation system

Geothermics, 2015
Abstract Due to a good behavior of ammonia–water mixture during the two-phase heat addition process, a Kalina cycle using ammonia–water as working fluid is employed to further recover the heat of geothermal water from a flash cycle for geothermal resources.
Jianyong Wang, Jiangfeng Wang, Yiping Dai, Pan Zhao   +3 more
openaire   +1 more source

Thermodynamic design of a power optimized irreversible thermionic generator

IECEC-97 Proceedings of the Thirty-Second Intersociety Energy Conversion Engineering Conference (Cat. No.97CH6203), 1997
The operating temperatures of the electrodes in a thermionic (TI) energy generator can better be determined through thermodynamic optimization rather than through heuristic principles. Since the power output of a TI generator has high functional dependence on operating temperatures, choice of these temperatures becomes a crucial aspect in the design of
openaire   +1 more source

Thermodynamic performance optimization of the absorption-generation process in an absorption refrigeration cycle

Energy Conversion and Management, 2016
Abstract The absorption refrigeration cycle is a basic cycle that establishes the systems for utilizing mid-low temperature heat sources. A new thermal compressor model with a key parameter of boost pressure ratio is proposed to optimize the absorption-generation process. The ultimate generation pressure and boost pressure ratio are used to represent
Yi Chen, Wei Han, Hongguang Jin
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Optimization of the Thermodynamics Cycles of Generation IV Gas-Cooled Fast Reactors

Volume 6B: Energy, 2013
This paper deals with the thermo-hydraulic properties of Generation IV Gas Cooled Fast Reactors. The paper is focused on the comparison of direct and indirect thermodynamic cycles of helium cooled reactors from a thermodynamic point of view. The calculation includes pressure losses at all major parts of the equipment — reactor, heat exchangers, pipe ...
Jiří Polanský, Roman Gášpár
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Discussion on the applicability of entropy generation minimization to the analyses and optimizations of thermodynamic processes

Energy Conversion and Management, 2013
Abstract This work reports the analyses of some thermodynamic systems with the concepts of entropy generation, entropy generation numbers and revised entropy generation number, as well as exergy destruction number and exergy-work conversion efficiency that are proposed in this paper.
XueTao Cheng, XinGang Liang
openaire   +1 more source