Exergy and exergoeconomic analysis of a Compressed Air Energy Storage combined with a district energy system

Bagdanavičius, Audrius; Jenkins, Nick

doi:10.1016/j.enconman.2013.09.063

Cited by 83 publications

(27 citation statements)

References 27 publications

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“…Recently, the attention seems to be also devoted to small-size and/or innovative applications as confirmed by the technical literatures [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 90%

A New Tri-Generation System: Thermodynamical Analysis of a Micro Compressed Air Energy Storage

Vallati¹,

Grignaffini²,

Quintino³

et al. 2016

JEPE

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There is a growing interest in the electrical energy storage system, especially for matching intermittent sources of renewable energy with customers' demand. Furthermore, it is possible, with these system, to level the absorption peak of the electric network (peak shaving) and the advantage of separating the production phase from the exertion phase (time shift). CAES (compressed air energy storage systems) are one of the most promising technologies of this field, because they are characterized by a high reliability, low environmental impact and a remarkable energy density. The main disadvantage of big systems is that they depend on geological formations which are necessary to the storage. The micro-CAES system, with a rigid storage vessel, guarantees a high portability of the system and a higher adaptability even with distributed or stand-alone energy productions. This article carries out a thermodynamical and energy analysis of the micro-CAES system, as a result of the mathematical model created in a Matlab/Simulink ® environment.New ideas will be discussed, as the one concerning the quasi-isothermal compression/expansion, through the exertion of a biphasic mixture, that will increase the total system efficiency and enable a combined production of electric, thermal and refrigeration energies. The exergy analysis of the results provided by the simulation of the model reports that more than one third of the exergy input to the system is lost. This is something promising for the development of an experimental device.

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“…Recently, the attention seems to be also devoted to small-size and/or innovative applications as confirmed by the technical literatures [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 90%

A New Tri-Generation System: Thermodynamical Analysis of a Micro Compressed Air Energy Storage

Vallati¹,

Grignaffini²,

Quintino³

et al. 2016

JEPE

View full text Add to dashboard Cite

show abstract

“…The liquid piston compressor and expansion efficiency can be calculated using the polytropic index of compression and expansion in (9) and (15), respectively. The polytropic index is calculated from the -curve (pressure-temperature curve) considering 95% confidence interval valves.…”

Section: Liquid Piston Based Ocaesmentioning

confidence: 99%

“…Their analysis illustrated that drawbacks of existing CAES systems can be addressed by employing innovative CAES concepts. Bagdanavicius and Jenkins investigated the potential for using heat generated during compression stage of CAES with a district energy system [9]. Exergy and exergoeconomic analysis of CAES and CAES with thermal storage were performed by them.…”

Section: Introductionmentioning

confidence: 99%

Energy and Exergy Analysis of Ocean Compressed Air Energy Storage Concepts

Patil

2018

Journal of Engineering

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Optimal utilization of renewable energy resources needs energy storage capability in integration with the electric grid. Ocean compressed air energy storage (OCAES) can provide promising large-scale energy storage. In OCAES, energy is stored in the form of compressed air under the ocean. Underwater energy storage results in a constant-pressure storage system which has potential to show high efficiency compared to constant-volume energy storage. Various OCAES concepts, namely, diabatic, adiabatic, and isothermal OCAES, are possible based on the handling of heat in the system. These OCAES concepts are assessed using energy and exergy analysis in this paper. Roundtrip efficiency of liquid piston based OCAES is also investigated using an experimental liquid piston compressor. Further, the potential of improved efficiency of liquid piston based OCAES with use of various heat transfer enhancement techniques is investigated. Results show that adiabatic OCAES shows improved efficiency over diabatic OCAES by storing thermal exergy in thermal energy storage and isothermal OCAES shows significantly higher efficiency over adiabatic and diabatic OCAES. Liquid piston based OCAES is estimated to show roundtrip efficiency of about 45% and use of heat transfer enhancement in liquid piston has potential to improve roundtrip efficiency of liquid piston based OCAES up to 62%.

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“…The goal of exergoeconomic analysis is to determine the exergetic unit costs of the rational use and conservation of energy (Manesh et al, 2014;Bagdanavicius & Jenkins, 2014).…”

Section: Exergoeconomic Analysismentioning

confidence: 99%

<b>Techno-economic and Exergoeconomic Analysis of a micro cogeneration system for a residential use

Ochoa¹,

Dutra²,

Guerrero³

et al. 2016

Acta Sci. Technol.

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ABSTRACT. The aim of the study is to present an economic analysis of a micro cogeneration system using financial analysis (energy view) and exergoeconomic analysis (exergy view). This system uses a natural gas-fueled 30 kW microturbine to generate electricity, and to produce hot water by recovering energy from the waste heat in the exhaust gases by using a heat exchanger, which serves as the drive source of an absorption chiller with a nominal capacity of 35 kW. In the financial analysis economic indicators such as payback, net present value and internal rate of return were used to verify the economic feasibility of this system, while in the exergoeconomic analysis, the Theory of Exergetic Cost was used to determine the exergetic monetary costs. A thermodynamic model was developed on the EES-32 (Engineering Equation Solver) platform. On applying the financial analysis, the results showed that the micro cogeneration system is feasible with positive values of R$ 206,540.00 for NPV, 27% IRR and a 6-year payback. Based on the exergoeconomic analysis, the cogeneration system is also feasible since the monetary cost of the electricity is lower than that charged by the electricity company but this is only possible after the 5 th year.Keywords: net present value, IRR, payback, exergetic costs.Análise Tecno-econômica e Exergoeconomica de um sistema de microcogeração de para uso residencial RESUMO. Este trabalho tem como finalidade o estudo econômico de um sistema de microcogeração de energia utilizando a análise financeira (visão energética) e a análise exergoeconômica (visão exergética). Este sistema utiliza gás natural como combustível primário para o acionamento de uma microturbina de 30 kW para produzir eletricidade, e água quente pelo do reaproveitamento da energia do calor residual dos gases de escape por meio de um recuperador de calor, que serve como fonte de acionamento de um chiller de absorção de 35 kW de capacidade nominal. Na análise financeira foram utilizados os indicadores econômicos tais como: o payback, o valor presente liquido, e a taxa interna de retorno, para verificar a viabilidade econômica do sistema de microcogeração, enquanto na análise exergoeconômica, foi considerada a teoria de custos exergéticos para a determinação dos custos monetários exergéticos. Foi desenvolvido um modelo termodinâmico na plataforma EES-32 (Engineering Equation Solver). Da aplicação da análise financeira os resultados mostraram que o sistema de microcogeração é viável com valores positivos de R$ 206.540,00 de VPL, 27% de TIR, 6 anos de retorno do capital. A partir da análise exergoeconômica, o sistema de cogeração também mostrou-se viável já que o custo monetário da eletricidade é menor do fornecido pela companhia de eletricidade, mas isso é possível após o 5º ano.Palavras-chave: valor presente liquido, TIR, payback, custos exergéticos.

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Exergy and exergoeconomic analysis of a Compressed Air Energy Storage combined with a district energy system

Cited by 83 publications

References 27 publications

A New Tri-Generation System: Thermodynamical Analysis of a Micro Compressed Air Energy Storage

A New Tri-Generation System: Thermodynamical Analysis of a Micro Compressed Air Energy Storage

Energy and Exergy Analysis of Ocean Compressed Air Energy Storage Concepts

<b>Techno-economic and Exergoeconomic Analysis of a micro cogeneration system for a residential use

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