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Renewable energy and the need for local energy markets
Hvelplund, Frede - In: Energy 31 (2006) 13, pp. 2293-2302
In Denmark, a technological change towards cleaner energy technologies has been developed and implemented since around 1975. This development has had two phases: The first from 1975 until around 1996, when wind power was a niche production that supplied only 3.5% of the electricity consumption...
Persistent link: https://www.econbiz.de/10010811966
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Detailed comparative study regarding different formulae of predicting the iron losses in a machine excited by non-sinusoidal supply
El-Kharashi, Eyhab - In: Energy 73 (2014) C, pp. 513-522
Variable-speed drives in any machine provide an accurate control and high-energy efficiency. More and more often …. The paper aims to achieve accurate efficiency estimation by presenting a new modified calculation method to predict the …
Persistent link: https://www.econbiz.de/10010906838
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Performance comparison of different supercritical carbon dioxide Brayton cycles integrated with a solar power tower
Al-Sulaiman, Fahad A.; Atif, Maimoon - In: Energy 82 (2015) C, pp. 61-71
and thermal efficiencies for these cycles was performed. The findings demonstrated that the highest thermal efficiency was … achieved using the recompression Brayton cycle, at June noontime. The maximum integrated system thermal efficiency using this … cycle was 40% while the maximum thermal efficiency of this cycle alone was 52%. The regenerative Brayton cycle, although …
Persistent link: https://www.econbiz.de/10011209443
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The impact of two-stage discharging on the exergoeconomic performance of a storage-type domestic water-heater
Atikol, U.; Aldabbagh, L.B.Y. - In: Energy 83 (2015) C, pp. 379-386
The present study is concerned with the exergoeconomic performance analysis of a storage-type electrical water heater, being subjected to two volumes of hot water removals at 5 L/min; the first one immediately after the heating of water in the tank, and the second, after some time has been...
Persistent link: https://www.econbiz.de/10011264418
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Line start permanent magnet synchronous motors: Challenges and opportunities
Hassanpour Isfahani, Arash; Vaez-Zadeh, Sadegh - In: Energy 34 (2009) 11, pp. 1755-1763
motors efficiency as one of the greatest energy consumption apparatuses in the world. Induction motors constitute, by far … powerful candidate with growing market are investigated in some details. The motor opportunities like high efficiency, high …
Persistent link: https://www.econbiz.de/10010807313
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A dynamic model for the efficiency optimization of an oscillatory low grade heat engine
Markides, Christos N.; Smith, Thomas C.B. - In: Energy 36 (2011) 12, pp. 6967-6980
the second law efficiency of the device by 50% points, corresponding to a 3.8% point increase in thermal efficiency. …
Persistent link: https://www.econbiz.de/10010807350
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A comparison of exergy efficiency definitions with focus on low temperature processes
Marmolejo-Correa, Danahe; Gundersen, Truls - In: Energy 44 (2012) 1, pp. 477-489
This work compares two classes of exergy efficiency definitions and applies them on a simple process (i.e. PRICO) for … efficiency definitions already proposed in the literature. In addition, the paper highlights the importance of decomposing the …
Persistent link: https://www.econbiz.de/10010807458
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Advances in hydrogen production by thermochemical water decomposition: A review
Rosen, Marc A. - In: Energy 35 (2010) 2, pp. 1068-1076
Hydrogen demand as an energy currency is anticipated to rise significantly in the future, with the emergence of a hydrogen economy. Hydrogen production is a key component of a hydrogen economy. Several production processes are commercially available, while others are under development including...
Persistent link: https://www.econbiz.de/10010807569
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Energy, exergy, and Second Law performance criteria
Lior, Noam; Zhang, Na - In: Energy 32 (2007) 4, pp. 281-296
and use of energy and exergy based performance criteria, and of the Second Law efficiency, with an aim at the advancement …
Persistent link: https://www.econbiz.de/10010807607
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Energetic and exergetic performance analyses of a combined heat and power plant with absorption inlet cooling and evaporative aftercooling
Khaliq, Abdul; Dincer, Ibrahim - In: Energy 36 (2011) 5, pp. 2662-2670
in detail. The effects of some main parameters on the exergy destruction and exergy efficiency of the cycle are … cooling along with evaporative aftercooling has an obvious increase in the energy and exergy efficiency compared to the basic … gas turbine cycle cogeneration. It is further shown that the first-law efficiency, power to heat ratio and exergy …
Persistent link: https://www.econbiz.de/10010807748