Optimum performance characteristics of an irreversible solar-driven Brayton heat engine at the maximum overall efficiency

Zhang, Yue; Lin, Bihong; Chen, Jincan

doi:10.1016/j.renene.2006.02.008

Cited by 34 publications

(23 citation statements)

References 26 publications

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“…Zhang et al [32] established a model in which the heat losses of the solar collector and the external and internal irreversibilities of a solar-driven Brayton heat engine were taken into account. Thus, this model was done for a solar thermal Brayton cycle without a recuperator.…”

Section: Optimisation Results and Influencing Factorsmentioning

confidence: 99%

A review on the thermodynamic optimisation and modelling of the solar thermal Brayton cycle

Roux

Bello‐Ochende

Meyer

2013

Renewable and Sustainable Energy Reviews

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Many studies have been published on the performance and optimisation of the Brayton cycle and solar thermal Brayton cycle showing the potential, merits and challenges of this technology. Solar thermal Brayton systems have potential to be used as power plants in many sun-drenched countries. It can be very competitive in terms of efficiency, cost and environmental impact. When designing a system such as a recuperative Brayton cycle there is always a compromise between allowing effective heat transfer and keeping pressure losses in components small. The high temperatures required in especially the receiver of the system presents a challenge in terms of irreversibilities due to heat loss. In this paper, the authors recommend the use of the total entropy generation minimisation method. This method can be applied for the modelling of a system and can serve as validation when compared with first-law modelling. The authors review various modelling perspectives required to develop an objective function for solar thermal power optimisation, including modelling of the sun as an exergy source, the Gouy-Stodola theorem and turbine modelling.With recommendations, the authors of this paper wish to clarify and simplify the optimisation and modelling of the solar thermal Brayton cycle for future work. The work is applicable to solar thermal studies in general but focuses on the small-scale recuperated solar thermal Brayton cycle.2

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Section: Optimisation Results and Influencing Factorsmentioning

confidence: 99%

A review on the thermodynamic optimisation and modelling of the solar thermal Brayton cycle

Roux

Bello‐Ochende

Meyer

2013

Renewable and Sustainable Energy Reviews

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“…Heat transfer fluid contained in the receiver is then heated up to desirable working temperatures and pressures in order to generate electricity in a small engine attached to the receiver [62]. Engines currently under consideration include Stirling [63] and Brayton engines [64]. Several prototype dish-engine systems, ranging from 7kW to 25kW have been deployed in various locations in the USA.…”

Section: Parabolic Dish Collectorsmentioning

confidence: 99%

A review of solar collectors and thermal energy storage in solar thermal applications

2013

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Thermal applications are drawing increasing attention in the solar energy research field, due to their high performance in energy storage density and energy conversion efficiency. In these applications, solar collectors and thermal energy storage systems are the two core components. This paper focuses on the latest developments and advances in solar thermal applications, providing a review of solar collectors and thermal energy storage systems. Various types of solar collectors are reviewed and discussed, including both non-concentrating collectors (low temperature applications) and concentrating collectors (high temperature applications). These are studied in terms of optical optimisation, heat loss reduction, heat recuperation enhancement and different suntracking mechanisms. Various types of thermal energy storage systems are also reviewed and discussed, including sensible heat storage, latent heat storage, chemical storage and cascaded storage. They are studied in terms of design criteria, material selection and different heat transfer enhancement technologies. Last but not least, existing and future solar power stations are overviewed.

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“…According to Duffie and Beckman [57] and Zhang et al [58], a concentrating collector is considered where heat losses at intermediate and low temperatures are mainly affiliated with convection and conduction; however, at high sufficient temperatures, heat losses due to radiation are prevailing. Thanks to this consideration, in our approach, the effective energy attributed to the heat engine, _ Q H , and the solar collector's efficiency, g s , can be formulated as following as [56,58,59]:…”

Section: Theoretical Modelmentioning

confidence: 99%

“…Thanks to this consideration, in our approach, the effective energy attributed to the heat engine, _ Q H , and the solar collector's efficiency, g s , can be formulated as following as [56,58,59]:…”

Section: Theoretical Modelmentioning

confidence: 99%

“…In the aforementioned formulas, s ¼ T H =T L stands for the temperature ratio of the heat reservoirs; G denotes the solar irradiance; A r and A a represent the absorber and aperture areas, correspondingly; C ¼ A a =A r denotes the concentration ratio; g 0 represents optical efficiency (the efficient transmittance absorptance product); and M is formulated as M ¼ U L T L =ðg 0 GCÞ, where U L stands for an accounted overall effective coefficient for losses due to radiation in terms of linear heat loss [57,58]. The fundamental formulations of the approach are as follows [30,56,58,59]:…”

Section: Theoretical Modelmentioning

confidence: 99%

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Performance Optimization of a Solar-Driven Multi-Step Irreversible Brayton Cycle Based on a Multi-Objective Genetic Algorithm

Ahmadi

Feidt

2014

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-An applicable approach for a multi-step regenerative irreversible Brayton cycle on the basis of thermodynamics and optimization of thermal efficiency and normalized outpuzt power is presented in this work. In the present study, thermodynamic analysis and a NSGA II algorithm are coupled to determine the optimum values of thermal efficiency and normalized power output for a Brayton cycle system. Moreover, three well-known decision-making methods are employed to indicate definite answers from the outputs gained from the aforementioned approach. Finally, with the aim of error analysis, the values of the average and maximum error of the results are also calculated.Re´sume´-Optimisation des performances d'un cycle de Brayton irre´versible solarise´a`compressions et de´tentes multiples sur la base d'un algorithme ge´ne´tique multi-objectif -Une approche applicable a`un cycle de Brayton irre´versible re´ge´ne´ratif a`compressions et de´tentes multiples, sur la base de la thermodynamique, de l'optimisation du rendement thermique et de la puissance de sortie normalise´e, est pre´sente´e dans cet article. Dans la pre´sente e´tude, l'analyse thermodynamique et un algorithme NSGA II sont couple´s, afin de de´terminer les valeurs optimales de rendement thermique et de puissance de sortie normalise´e pour un syste`me ac ycle de Brayton. En outre, trois me´thodes de prise de de´cision bien connues sont utilise´es pour indiquer des re´ponses de´finies a`partir des re´sultats obtenus a`partir de l'approche mentionne´e ci-dessus. Enfin, afin d'analyser les e´ventuelles erreurs, les valeurs de la moyenne et de l'erreur maximale des re´sultats sont e´galement calcule´es.

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Optimum performance characteristics of an irreversible solar-driven Brayton heat engine at the maximum overall efficiency

Cited by 34 publications

References 26 publications

A review on the thermodynamic optimisation and modelling of the solar thermal Brayton cycle

A review on the thermodynamic optimisation and modelling of the solar thermal Brayton cycle

A review of solar collectors and thermal energy storage in solar thermal applications

Performance Optimization of a Solar-Driven Multi-Step Irreversible Brayton Cycle Based on a Multi-Objective Genetic Algorithm

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