Thermodynamic analysis of simple and regenerative Brayton cycles for the concentrated solar power applications

Javanshir, Alireza; Sarunac, Nenad; Razzaghpanah, Zahra

doi:10.1016/j.enconman.2018.02.079

Cited by 38 publications

(15 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…owing is a det case studies d for the cacu ents. cess descripti owing is a det case studies d for the cacu ents Figure 1. system the ou valuating the b ndamental Eq damental therm ature [20],whic e first law of g equation 1on, the second (2). 4For ideal gases, the analysis of entropy between two states is governed by equation (5).…”

Section: Isotropic Isentropic Compressmentioning

confidence: 99%

Computer-Aided Exergy Study of a Gas Microturbine Cogeneration System

Ochoa¹,

Forero²,

Quiñones³

2018

IJET

View full text Add to dashboard Cite

In the following article, an exergetic analysis of a microturbine operating with a regenerative Brayton cycle was carried out in order to identify the variation in exergy and exergy destruction behaviour generated in each component of the system by comparing these results to different microturbine loads. The study was carried out on a Brayton cycle with cogeneration which is composed of a compressor, combustion chamber, gas turbine, HRSG and an air preheater. In which the output power of the turbine was varied for the five case studies starting at 25kW to 45kW. As the study is carried out, at 45kW the greatest exergy is consumed and in the combustion chamber it is the one that contributes most to the destruction of exergy, adding up to an average of 36.5% of the total destroyed. With this it was shown that the increase of the power output of the turbine increases the needs of each component of the system and also increases the exertions of the system. Keywords-Computer-aided simulation, cogeneration system, microturbine, exergetic performance. I. INTRODUCTION One of the thermodynamic cycles used for power generation is the Brayton Cycle, which uses gas, diesel or light fuels as fuel. These cycles have been studied in order to improve their performance[1-4]. In these cycles the simulation performance has been improved, modifying some parameters such as mass flow in the equipment, in order to achieve maximum power and less exergy destruction[5]. In the case of a regenerative Brayton cycle, where the difference with the original is that the flow of hot air does not fully expand to atmospheric pressure before entering the regenerator, the improvement obtained has allowed to achieve a thermal efficiency between 12% and 26%[6]. In addition, it has been demonstrated that the dimensionless power of the cycle can be optimized by looking for both the optimum heat transfer distributions between the hot and cold side of the heat exchanger and the optimum pressure ratio between the equipment[7]. However, all the proposed improvements found for these systems lead to smaller engine components such as compressors, turbine, regenerator and heat exchanger[8]. In addition, other studies have made it possible to optimize the entropy generation rate by 70% through the use of an ecological optimization function, bringing power generation close to the maximum capacity of the equipment defined by its design conditions[9]. One criterion for optimising Brayton cycles is the thermosetting analysis[10-12], where the total cost analysis takes into account the cost of fuel, investment, environment, operation and maintenance, as well as irreversibilities due to finite rate heat transfer, internal dissipations and pressure drops[13]. This criterion under the thermo-economical approach was used in a gas power generation system, allowing to identify an optimal point of operation where an efficiency of 71% of the maximum power was reached by means of multiple objective optimization functions, an exergy destruction of 24% lower and 67% less in the ...

show abstract

Section: Isotropic Isentropic Compressmentioning

confidence: 99%

Computer-Aided Exergy Study of a Gas Microturbine Cogeneration System

Ochoa¹,

Forero²,

Quiñones³

2018

IJET

View full text Add to dashboard Cite

show abstract

“…Besides, the super‐critical operating condition requires higher density, and the working gas in the cycle acts like a liquid. So, the compression process needs less power and improves the system's performance 7 …”

Section: Introductionmentioning

confidence: 99%

“…Zhu et al 12 in another comparative study, showed that an S‐CO 2 with the intercooling and partial‐cooling processes enhances the system's efficiency and output power. Javanshir et al 7 studied employing different working fluids for a super‐critical Brayton cycle performance and showed that helium presents the highest net power while CO 2 has provided the best energetic efficiency.…”

Section: Introductionmentioning

confidence: 99%

Proposal and evaluation of a solar‐based polygeneration system: Development, exergoeconomic analysis, and multi‐objective optimization

Azizi

Nedaei

Yari

2022

Intl J of Energy Research

View full text Add to dashboard Cite

This article reviews a novel poly-generation system based on a solar power tower for power generation, cooling capacity, freshwater creation, and hydrogen production. Comprehensive thermodynamic assessments are conducted to determine the performance of the proposed model. At basic operating circumstances, the simulation results in the generation of 7.871 MW of electricity, 10.05 kg/s of drinking water, 8.788 MW cooling capacity, and hydrogen at a rate of 0.2445 kg/h accompanied by 41.18% energy efficiency and a sum unit cost of products of 6.583 $/GJ. Then, parametric research is going to determine the influence of the proposed system's primary parameters on its performance.Additionally, the gray wolf optimization technique is used to optimize the exergetic efficiency with sum unit cost products and freshwater rate of production under various multi-objective optimization situations. The first optimization scenario's results indicate that the 53.06% exergetic efficiency and 5.44 $/GJ sum unit cost products are the optimum point, and in the second optimization scenario, the optimum point is 47.64% exergetic efficiency and 9.61 kg/s freshwater production rate. Finally, the performance of the suggested method is demonstrated using a case study of New York, United States of America, and represented the maximum performance in July with 5.2 MW net power and 39.6% exergetic efficiency.

show abstract

“…18 The efficiency of the CSP system is mainly improved by increasing the operating temperature of the heat engine. 19,20 A CSP combined with the Brayton− Rankine cycle can achieve over 60% thermal−electric conversion efficiency when the operating temperature reaches 1200 °C. 21 The operating temperature of Fe 2 O 3 /Fe 3 O 4 reaches up to nearly 1400 °C, which leads to few studies on the TCES performance of the material.…”

Section: Introductionmentioning

confidence: 99%

“…Among various TCES reaction systems, metal oxides in gas–solid reaction systems (e.g., Co 3 O 4 /CoO, , Mn 2 O 3 /Mn 3 O 4 , and Fe 2 O 3 /Fe 3 O 4 ) are outstanding because the metal oxide system simplifies the structure of the CSP system, covers a wild temperature range, and provides flexibility for TCES device design . The efficiency of the CSP system is mainly improved by increasing the operating temperature of the heat engine. , A CSP combined with the Brayton–Rankine cycle can achieve over 60% thermal–electric conversion efficiency when the operating temperature reaches 1200 °C . The operating temperature of Fe 2 O 3 /Fe 3 O 4 reaches up to nearly 1400 °C, which leads to few studies on the TCES performance of the material.…”

Section: Introductionmentioning

confidence: 99%

FeO_x-Based Minerals Derived from Coal-Fired Fly Ash Used for High-Temperature Thermochemical Energy Storage

Zhou

Liu

et al. 2022

Energy Fuels

View full text Add to dashboard Cite

Fe 2 O 3 /Fe 3 O 4 redox couple is a less explored system used for high-temperature thermochemical energy storage. There is a kind of FeO x -based mineral in coal-fired fly ash that is mainly composed of FeO x and contains a small amount of silica− aluminate impurities. This industrial solid waste produced in huge quantities every year has the potential to be used for thermochemical energy storage. In this work, pretreatment was carried out on FeO x -based minerals derived from different fly ashes to improve their thermochemical energy storage capacity, and cyclic thermochemical energy storage properties were tested using a thermogravimetric analyzer under an air atmosphere. It is found that the energy storage densities of the FeO x -based minerals are in the range of 297.79−342.00 kJ/mol, and the maximum value even exceeds the energy storage density of commercial Fe 2 O 3 . The oxidation reaction process of FeO x -based minerals is much slower than that of commercial Fe 2 O 3 because the pore structure of FeO x -based minerals is degraded in comparison to that of commercial Fe 2 O 3 . It is found that the majority of FeO x -based minerals are spheroids with a shell−core structure, and the Fe content in the outer layer is lower than that in the inner core, which will affect the reaction rate. The master plot method and Friedman method were further used to investigate the kinetics of the reduction reaction of the FeO x -based minerals. It is found that the reduction reaction of FeO x -based minerals follows a Prout−Tompkins reaction mechanism. An economic analysis of the FeO x -based minerals for energy storage was carried out, and there is a coal saving of 139.4 tonnes/day for their use in a photothermal power plant. In summary, the FeO x -based minerals have the potential to be used for large-scale thermochemical heat storage.

show abstract

Thermodynamic analysis of simple and regenerative Brayton cycles for the concentrated solar power applications

Cited by 38 publications

References 22 publications

Computer-Aided Exergy Study of a Gas Microturbine Cogeneration System

Computer-Aided Exergy Study of a Gas Microturbine Cogeneration System

Proposal and evaluation of a solar‐based polygeneration system: Development, exergoeconomic analysis, and multi‐objective optimization

FeO_x-Based Minerals Derived from Coal-Fired Fly Ash Used for High-Temperature Thermochemical Energy Storage

Contact Info

Product

Resources

About

Thermodynamic analysis of simple and regenerative Brayton cycles for the concentrated solar power applications

Cited by 38 publications

References 22 publications

Computer-Aided Exergy Study of a Gas Microturbine Cogeneration System

Computer-Aided Exergy Study of a Gas Microturbine Cogeneration System

Proposal and evaluation of a solar‐based polygeneration system: Development, exergoeconomic analysis, and multi‐objective optimization

FeOx-Based Minerals Derived from Coal-Fired Fly Ash Used for High-Temperature Thermochemical Energy Storage

Contact Info

Product

Resources

About

FeO_x-Based Minerals Derived from Coal-Fired Fly Ash Used for High-Temperature Thermochemical Energy Storage