Results 171 to 180 of about 214 (209)

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 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
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

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

Thermodynamic Optimization of Dual Pressure Heat Recovery Power Generation in Cement Production

2012 Asia-Pacific Power and Energy Engineering Conference, 2012
The optimization goal for a waste heat revovery power generation system is to obtain maximum power output per ton clinker without increasing the heat rate of the cement production. The genetic algorithm theory was utilized to abtain the optimal match of thermodynamic parameters.
Qianjun Li, Jintao Huang, Xiaohui Xu
openaire   +1 more source

A method for thermodynamic optimization —II. Application to an absorption heat pump and generalization of the method

Energy, 1992
Abstract A general formula for the overall efficiency of a system in terms of the efficiencies of its components is used to optimize the flowsheet of an absorption heat pump. We demonstrate that the exergetic efficiency diagram ηe, i vs load (the portion of exergy input λi) gives a general approach for treating any process.
M.V. Sorin, P. Le Goff
openaire   +2 more sources

Thermodynamic and Economic Optimization of a MCFC Power Generation Unit Coupled With Hydrogen Production

ASME 2009 3rd International Conference on Energy Sustainability, Volume 1, 2009
In this paper, a biogas fuelled power generation system is considered. The system is based on a molten carbonate fuel cell (MCFC) stack integrated with a micro gas turbine for electricity generation, coupled with a pressure swing absorption system (PSA) for hydrogen production.
Flavio Nicolin, Vittorio Verda
openaire   +1 more source

Optimal thermodynamic and economic volume of a heat recovery steam generator by constructal design

International Communications in Heat and Mass Transfer, 2012
Abstract The ratios of gas flow to steam flow are huge in heat recovery steam generators (HRSGs) compared to other steam generators. So the volume which is occupied by components of the HRSG such as economizer, evaporator and superheater is important factor when the HRSG is applied in structures including buildings and ships.
Elnaz Norouzi, Majid Amidpour
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Entropy generation and thermodynamic optimization of fully developed laminar convection in a helical coil

International Communications in Heat and Mass Transfer, 2005
The present paper analyses the entropy generation of the fully developed laminar convection in a helical coil with constant wall heat flux and presents the optimal design based on the minimum entropy generation principal. The important design parameters, including Reynolds number (Re), coil-to-tube radius ratio (δ) and nondimensional coil pitch (λ) are
T.H. Ko, K. Ting
openaire   +1 more source