17-05-2013 | Yao, Jun ; Li, Qing ; Chen, Zhe ; Liu, Aolin, Energies, 2013

This paper presents a coordinated control method for a doubly-fed induction generator (DFIG)-based wind-power generation system with a series grid-side converter (SGSC) under distorted grid voltage conditions. The detailed mathematical models of the DFIG system with SGSC are developed in the ...

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16-05-2013 | Marrero, Gustavo A.; Ramos-Real, Francisco J., Energies, 2013

This paper studies the change in Energy Intensity (EI) of the main economic activities in the EU15 countries, which represents approximately 45% of their final energy consumption. The purpose is, first, to measure the different patterns between the countries by establishing differentiated ...

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15-05-2013 | Tedeschi, Elisabetta ; Sjolte, Jonas ; Molinas, Marta ; Santos, Maider, Energies, 2013

The future success of wave energy in the renewable energy mix depends on the technical advancements of the specific components and systems, on the grid access availability and, ultimately, on the economical profitability of the investment. Small and remote islands represent an ideal framework ...

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15-05-2013 | Shires, Andrew, Energies, 2013

There has been a resurgence of interest in the development of vertical axis wind turbines which have several inherent attributes that offer some advantages for offshore operations, particularly their scalability and low over-turning moments with better accessibility to drivetrain components. ...

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13-05-2013 | Wang, Yi ; Xu, Chun-Gang ; Li, Xiao-Sen ; Li, Gang ; Chen, Zhao-Yang, Energies, 2013

A complete set of scaling criteria for gas hydrate reservoir of five-spot well system case is derived from the 3D governing equations, involving the mass balance equation, the energy balance equation, the kinetic model, the endothermic model and the phase equilibrium model. In the scaling ...

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08-05-2013 | Li, Miao ; Mu, Hailin ; Li, Huanan, Energies, 2013

Combined Cooling, Heating and Power (CCHP) systems have been widely used in different kinds of buildings to make better use of fuels because of their high overall efficiency. This paper presents a mathematical analysis of a CCHP system in comparison to a Heating, Ventilation and Air ...

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07-05-2013 | Byun, Jae-Ki ; Jeong, Dong-Hwa ; Choi, Young-Don ; Shin, Jong-Keun, Energies, 2013

In the present study, a fuel cell driven ground source heat pump (GSHP) system is applied in a community building and heat pump system performance is analyzed by computational methods. Conduction heat transfer between the brine pipe and ground is analyzed by TEACH code in order to predict the ...

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06-05-2013 | Jensen, Jesper Ole; Nielsen, Susanne Balslev; Hansen, Jesper Rohr, Energies, 2013

This paper presents current research on Danish municipalities’ use of Energy Service Companies (ESCO) as a way to improve the standard of public buildings and to increase energy efficiency. In recent years more and more municipalities have used ESCO-contracts to retrofit existing public ...

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03-05-2013 | Su, Faqiang ; Nakanowataru, Takuya ; Itakura, Ken-ichi ; Ohga, Koutarou ; Deguchi, Gota, Energies, 2013

In the underground coal gasification (UCG) process, cavity growth with crack extension inside the coal seam is an important phenomenon that directly influences gasification efficiency. An efficient and environmentally friendly UCG system also relies upon the precise control and evaluation of ...

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29-04-2013 | Sammartano, Vincenzo ; Aricò, Costanza ; Carravetta, Armando ; Fecarotta, Oreste ; Tucciarelli, Tullio, Energies, 2013

In hydropower, the exploitation of small power sources requires the use of small turbines that combine efficiency and economy. Banki-Michell turbines represent a possible choice for their simplicity and for their good efficiency under variable load conditions. Several experimental and ...

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