نتایج جستجو برای: exergy cost

تعداد نتایج: 389645  

Journal: :energy equipment and systems 0
mohammad mahdi naserian department of mechanical engineering, university of sistan and baluchestan, zahedan, iran said farahat department of mechanical engineering, university of sistan and baluchestan, zahedan, iran faramarz sarhaddi department of mechanical engineering, university of sistan and baluchestan, zahedan, iran

in this study, the performance of an irreversible regenerative brayton cycle is sought through power maximizations using finite-time thermodynamic concept in finite-size components. optimizations are performed using a genetic algorithm. in order to take into account the finite-time and finite-size concepts in the current problem, a dimensionless mass-flow rate parameter is used to deploy time v...

2009
R. Palacios Bereche R. Gonzales Palomino

The aim of this work is to carry out a thermoeconomic analysis of a single and double-effect LiBr/H2O absorption refrigeration system. The methodology of functional analysis with negentropy is used. The exergetic cost of the main product, the cooling cost, was calculated as a function of the exergy of the heat source. Two cases were analyzed for each system: the first considers a direct-fired s...

Journal: :Entropy 2015
Zhenying Zhang Lirui Tong Li Chang Yanhua Chen Xingguo Wang

The performance characteristics of an ejector-expansion refrigeration cycle (EEC) using R32 have been investigated in comparison with that using R134a. The coefficient of performance (COP), the exergy destruction, the exergy efficiency and the suction nozzle pressure drop (SNPD) are discussed. The results show that the application of an ejector instead of a throttle valve in R32 cycle decreases...

2009
A. Al-Ghandoor

The present article is dedicated for evaluating the power generation sub-sector in terms of energetic and exergetic aspects. In this regard, energy and exergy utilization efficiencies during the period 1989-2006 are assessed based on real data obtained from main generators in Jordan. Sectoral energy and exergy analyses are conducted to study the variations of energy and exergy efficiencies for ...

Journal: :J. Applied Mathematics 2012
Abel Rouboa Valter Bruno Silva Nuno Couto

The main goal of this paper is to analyze the exergy losses during the shock and rarefaction wave of hydrogen-air mixture. First, detonation parameters pressure, temperature, density, and species mass fraction are calculated for three cases where the hydrogen mass fraction in air is 1.5%, 2.5%, and 5%. Then, exergy efficiency is used as objective criteria of performance evaluation. A two-dimens...

Journal: :E3S web of conferences 2021

This paper is part 1 of the investigation on exergetic and exergoeconomic parameters an existing system with air-to-water heat pump unit as a source. Part presents used experimental setup. The main aim conducted tests to develop model produced transfer rate energetic COP at different ambient conditions. obtained data in 2 study where assessment carried out. performance considered evaluated usin...

2016
George N. Prodromidis Frank A. Coutelieris

Biogas can be currently considered as an alternative option for electricity production, mainly due to its high energy content (hydrocarbon-rich source), its renewable status and its relatively low utilization cost. Solid Oxide Fuel Cell (SOFC) stacks convert fuel’s chemical energy to electricity with high efficiencies and reveal significant advantages on fuel flexibility combined with lower emi...

Journal: :energy equipment and systems 0
ali reza sheibani tezerji mechanical engineering department, islamic azad university, kerman branch, iran mohammad mehdi keshtkar mechanical engineering department, islamic azad university, kerman branch, iran

the purpose of this paper is multi-objective optimization of refrigeration cycle by optimization of all components of the cycle contains heat exchangers, air condenser, evaporator and super-heater. studied refrigeration cycle is compression refrigeration cycle of unit 132 third refineries in south pars that provide chilled water for cooling refinery equipment's. cycle will be performed by ...

2014
Yuan Tian Changying Zhao Alexei Lapkin

Cascaded thermal storage, consisting of multiple Phase Change Materials (PCMs) with different melting temperatures, has been proposed to solve the problem of poor heat transfer caused by unavoidable decrease of temperature differences during heat exchange process. This paper conducts a theoretical study of the overall thermal performance for a cascaded thermal storage system. Both heat transfer...

Journal: :Entropy 2016
Francesco Calise Luigi Libertini Maria Vicidomini

This paper presents a detailed exergetic analysis of a novel high-temperature Solar Assisted Combined Cycle (SACC) power plant. The system includes a solar field consisting of innovative high-temperature flat plate evacuated solar thermal collectors, a double stage LiBr-H2O absorption chiller, pumps, heat exchangers, storage tanks, mixers, diverters, controllers and a simple single-pressure Com...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید