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Heat transfer performance and exergetic optimization for solar receiver pipe
Jianfeng, Lu; Jing, Ding; Jianping, Yang - In: Renewable Energy 35 (2010) 7, pp. 1477-1483
The basic physical model of solar receiver pipe with solar selective coating is established, and associated heat transfer and exergetic performances are analyzed and optimized. Because of the heat losses of natural convection and infrared radiation, the energy absorption efficiency has a maximum...
Persistent link: https://www.econbiz.de/10010807044
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The exergy fields in transport processes: Their calculation and use
Lior, Noam; Sarmiento-Darkin, Wladimir; Al-Sharqawi, … - In: Energy 31 (2006) 5, pp. 553-578
This paper is a brief review of the method for analyzing the space and time dependent exergy and irreversibility fields …
Persistent link: https://www.econbiz.de/10010811889
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Influence of channel depth on the performance of solar air heaters
Sun, Wei; Ji, Jie; He, Wei - In: Energy 35 (2010) 10, pp. 4201-4207
In the design of solar air heaters (SAHs), channel depth is a principal variable to be fixed. In this paper, the effect of the channel depth on the energy gain of type I and type III SAHs has been investigated by computational fluid dynamics (CFD) simulations. Laminar model and k–ω turbulence...
Persistent link: https://www.econbiz.de/10011055539
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Energy Sustainability: A Pragmatic Approach and Illustrations
Rosen, Marc A. - In: Sustainability 1 (2009) 1, pp. 55-80
Many factors to be appropriately addressed in moving towards energy sustainability are examined. These include harnessing sustainable energy sources, utilizing sustainable energy carriers, increasing efficiency, reducing environmental impact and improving socioeconomic acceptability. The latter...
Persistent link: https://www.econbiz.de/10008683166
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High Enthalpy Geothermal Potential of the Deep Gas Fields in Central Drava Basin, Croatia
Kurevija, Tomislav; Vulin, Domagoj - In: Water Resources Management 25 (2011) 12, pp. 3041-3052
In Croatia there is an urgent need to improve energy balance with more efficient methods of energy resources exploitation. There are approximately 3,000 wells drilled on oil, gas/condensate and geothermal reservoirs, of which only 50 were primarily drilled for purpose of geothermal exploitation....
Persistent link: https://www.econbiz.de/10010794278
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Exergetic optimization of flat plate solar collectors
Farahat, S.; Sarhaddi, F.; Ajam, H. - In: Renewable Energy 34 (2009) 4, pp. 1169-1174
performance and design parameters of these solar to thermal energy conversion systems. A detailed energy and exergy analysis is … carried out for evaluating the thermal and optical performance, exergy flows and losses as well as exergetic efficiency for a … conditions and the optimum values of the mass flow rate, the absorber plate area and the maximum exergy efficiency have been …
Persistent link: https://www.econbiz.de/10010803825
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Performance and parametric investigation of a binary geothermal power plant by exergy
Kanoglu, Mehmet; Bolatturk, Ali - In: Renewable Energy 33 (2008) 11, pp. 2366-2374
Exergy analysis of a binary geothermal power plant is performed using actual plant data to assess the plant performance … and pinpoint sites of primary exergy destruction. Exergy destruction throughout the plant is quantified and illustrated … using an exergy diagram, and compared to the energy diagram. The sites with greater exergy destructions include brine …
Persistent link: https://www.econbiz.de/10010803881
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Exergy analysis of renewable energy sources
Koroneos, Christopher; Spachos, Thomas; Moussiopoulos, … - In: Renewable Energy 28 (2003) 2, pp. 295-310
reached a high standard at which it can be considered competitive to fossil fuels. The present study deals with the exergy …
Persistent link: https://www.econbiz.de/10010803931
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Energy and exergy efficiencies of a hybrid photovoltaic–thermal (PV/T) air collector
Joshi, Anand S.; Tiwari, Arvind - In: Renewable Energy 32 (2007) 13, pp. 2223-2241
In this communication, an attempt has been made to evaluate exergy analysis of a hybrid photovoltaic–thermal (PV … climatic conditions and then exergy efficiencies have been carried out. It is observed that an instantaneous energy and exergy …
Persistent link: https://www.econbiz.de/10010803946
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A procedure to select working fluids for Solar Organic Rankine Cycles (ORCs)
Rayegan, R.; Tao, Y.X. - In: Renewable Energy 36 (2011) 2, pp. 659-670
efficiency, net power generated, vapor expansion ratio, and exergy efficiency of the Rankine cycle has been proposed. Fluids with … fluids, the theoretical limits for irreversibility reduction and exergy efficiency enhancement through collector efficiency … the exergy efficiency of the cycle is fluid dependent while the effect of collector efficiency improvement on the exergy …
Persistent link: https://www.econbiz.de/10010803951