Exergy analysis of renewable energy sources

Koroneos, C.; Spachos, Thomas; Moussiopoulos, Ν.

doi:10.1016/s0960-1481(01)00125-2

Cited by 265 publications

(116 citation statements)

References 2 publications

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“…Exergy analysis is employed to detect and to evaluate quantitatively the causes of thermodynamic imperfection of the process under consideration. Exergy analysis indicates the possibilities of thermodynamic improvement of the process under consideration [30][31][32][33][34].…”

Section: Methodsmentioning

confidence: 99%

Exergetic Aspects of Hydrogen Energy Systems—The Case Study of a Fuel Cell Bus

Nanaki

Koroneos

2017

Sustainability

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Electrifying transportation is a promising approach to alleviate climate change issues arising from increased emissions. This study examines a system for the production of hydrogen using renewable energy sources as well as its use in buses. The electricity requirements for the production of hydrogen through the electrolysis of water, are covered by renewable energy sources. Fuel cells are being used to utilize hydrogen to power the bus. Exergy analysis for the system is carried out. Based on a steady-state model of the processes, exergy efficiencies are calculated for all subsystems. The subsystems with the highest proportion of irreversibility are identified and compared. It is shown that PV panel has exergetic efficiency of 12.74%, wind turbine of 45%, electrolysis of 67%, and fuel cells of 40%.

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Section: Methodsmentioning

confidence: 99%

Exergetic Aspects of Hydrogen Energy Systems—The Case Study of a Fuel Cell Bus

Nanaki

Koroneos

2017

Sustainability

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“…Losses are associated with mass flow, work interaction and heat interaction. Losses are the highest in the PV generator, and refer to the conversion of solar to electric energy (about 87 %; Koroneos et al, 2003) while the losses are significantly lower in the pump system (10-15 %; Margeta, 2011) and mostly relate to losses in friction due to fluid movement through pipes and equipment. Water in the reservoir/chamber is the available potential energy for water flow.…”

Section: Solar Photovoltaic Water Pumping Systemmentioning

confidence: 99%

Innovative approach for achieving of sustainable urban water supply system by using of solar photovoltaic energy

Margeta¹,

Đurin

2017

ing.inv.

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This paper describes and analyses new and innovative concepts for possible integration of solar photovoltaic (PV) energy in urban water supply system (UWSS). The proposed system consists of PV generator and invertor, pump station and water reservoir. The system is sized in such a manner that every part of it is sized separately and then, integrated into a whole. This integration is desirable for several reasons; the most important is the success of the objectives of sustainable living in urban areas i.e., achieving of sustainable urban water supply system. The biggest technological challenge associated with the use of solar, wind and other intermittent renewable energy sources RES is the realization of economically and environmentally friendly electric energy storage (EES). The paper elaborates the use of water reservoires in UWSS as EES. The proposed solution is still more expensive than the traditional and, is economically acceptable today in the cases of isolated urban water system and special situations. Wider application will depend on the future trends of energy prices, construction costs of PV generators and needs for CO 2 reduction by urban water infrastructure.Keywords: Urban water supply system, sustainability, solar photovoltaic energy, CO 2 reduction. RESUMENEste artículo describe y analiza conceptos nuevos e innovadores para la posible integración de la energía solar fotovoltaica (PV) en los sistemas de abastecimiento urbano de agua. El sistema propuesto consiste en un generador fotovoltaico y un inversor, una estación de bombeo y un depósito de agua. El sistema se dimensiona de tal forma que cada una de sus partes se clasifica por separado y luego se integran en un todo. Dicha integración es deseable por varias razones: la más importante es el éxito de los objetivos de la vida sostenible en las zonas urbanas, esto es, el desarrollo de un sistema sostenible de abastecimiento urbano de agua. El mayor desafío tecnológico asociado con el uso de energía solar, eólica y otras fuentes de energía renovable intermitentes, es que el almacenamiento de energía eléctrica sea económico y amable con el medio ambiente. En este documento se revisa el uso de reservorios de agua en los sistemas de abastecimiento, como una forma de almacenamiento de energía eléctrica. La solución propuesta es aun más costosa que la tradicional y, hoy en día, es económicamente aceptable en los casos de sistemas aisla-dos de agua urbana y situaciones especiales. Una aplicación más amplia dependerá de las futuras tendencias de los precios de la energía, los costos de construcción de los generadores fotovoltaicos y las necesidades de reducción de CO 2 por la infraestructura de agua urbana. IntroductionThe world today is faced with a growing number of inhabitants who concentrate in all major cities, mostly in the coastal marine zone (Roberts, 2011 andUNEP/PAP, 2007). In an increasingly urbanized world, there is a need to plan and manage our cities in order to sustain them. It is necessary to strive for urban areas that contribute ...

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“…Christopher Koroneos (2003) applied exergy analysis to renewable energy sources including wind power [7]. The actual use of wind energy from the existing available energy was discussed.…”

Section: Studies On Wind Farmmentioning

confidence: 99%

Exergy Analysis of Single Array Wind Farm Using Wake Effects

Saravanan¹,

Karthikeyan

Samuel³

2011

ENG

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The influence of wake parameters on the exergy analysis of single array wind farm is studied in this paper. Key parameters which influence wake effects in a wind farm are wind velocity, tip speed ratio, number of blades, rotor speed, rotor diameter and hub height. Three different models namely power, wake and exergy model were used in estimating the exergy efficiency of the single array wind farm. Even though it is ideal for wind farms to fix the wind turbines in rows and columns the conditions of the site may not always be conducive for it. Hence analysis has been done keeping the wind turbines at random in a row and the effect of positioning on the performance is analyzed. Energy and exergy efficiency calculations were made for different cases by varying the positions of wind turbines in the single array wind farm. Standard relations were used in estimating the energy deficit in the wind farm due to wake effects. The wake effects were found to have an aggregated influence on the energy production of the wind farm, which results from the changes in the key parameters mentioned above. Potential areas for reducing energy losses by proper location and selection of turbines based on rating are highlighted. The influence of individual parameters contributing to the wake effect were analyzed and discussed in detail.

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Exergy analysis of renewable energy sources

Cited by 265 publications

References 2 publications

Exergetic Aspects of Hydrogen Energy Systems—The Case Study of a Fuel Cell Bus

Exergetic Aspects of Hydrogen Energy Systems—The Case Study of a Fuel Cell Bus

Innovative approach for achieving of sustainable urban water supply system by using of solar photovoltaic energy

Exergy Analysis of Single Array Wind Farm Using Wake Effects

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