Author
Mehmet Esen
Bio: Mehmet Esen is an academic researcher from Fırat University. The author has contributed to research in topics: Heat pump & Coefficient of performance. The author has an hindex of 23, co-authored 27 publications receiving 5165 citations.
Papers
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TL;DR: In this article, the authors investigated greenhouse heating by biogas, solar and ground energy in Elazig, Turkey climate conditions, and the greenhouse was constructed and the required heating load of greenhouse was determined.
728 citations
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TL;DR: In this article, a horizontal ground source heat pump (GSHP) system was designed and constructed for space heating in a test room, Elazig (38.41°N, 39.14°E), Turkey.
470 citations
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TL;DR: In this paper, a comparison between ground-coupled heat pump (GCHP) and ACHP systems was made for space cooling in a test room in Firat University, Elazig (38.41°N, 39.14°E), Turkey.
422 citations
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TL;DR: In this article, a cylindrical phase change storage tank linked to a solar powered heat pump system is investigated experimentally and theoretically, and a simulation model defining the transient behaviour of the phase change unit was used.
407 citations
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TL;DR: In this article, the phase change material (PCM) is packed in cylinders and the heat transfer fluid (HTF) flows parallel to it (mode 1) and the second is suited to tanks where pipes containing the fluid are embedded in the PCM (mode 2).
374 citations
Cited by
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TL;DR: In this paper, a review of the history of thermal energy storage with solid-liquid phase change has been carried out and three aspects have been the focus of this review: materials, heat transfer and applications.
4,019 citations
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TL;DR: In this paper, the phase change problem has been formulated using pure conduction approach but the problem has moved to a different level of complexity with added convection in the melt being accounted for, which makes it difficult for comparison to be made to assess the suitability of PCMs to particular applications.
Abstract: This paper reviews the development of latent heat thermal energy storage systems studied detailing various phase change materials (PCMs) investigated over the last three decades, the heat transfer and enhancement techniques employed in PCMs to effectively charge and discharge latent heat energy and the formulation of the phase change problem. It also examines the geometry and configurations of PCM containers and a series of numerical and experimental tests undertaken to assess the effects of parameters such as the inlet temperature and the mass flow rate of the heat transfer fluid (HTF). It is concluded that most of the phase change problems have been carried out at temperature ranges between 0 °C and 60 °C suitable for domestic heating applications. In terms of problem formulation, the common approach has been the use of enthalpy formulation. Heat transfer in the phase change problem was previously formulated using pure conduction approach but the problem has moved to a different level of complexity with added convection in the melt being accounted for. There is no standard method (such as British Standards or EU standards) developed to test for PCMs, making it difficult for comparison to be made to assess the suitability of PCMs to particular applications. A unified platform such as British Standards, EU standards needs to be developed to ensure same or similar procedure and analysis (performance curves) to allow comparison and knowledge gained from one test to be applied to another.
1,630 citations
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TL;DR: In this paper, the state of the art of phase change materials (PCMs) for storing solar energy is discussed. But, prior to the large-scale practical application of this technology, it is necessary to resolve numerous problems at the research and development stage.
Abstract: The continuous increase in the level of greenhouse gas emissions and the climb in fuel prices are the main driving forces behind efforts to more effectively utilise various sources of renewable energy. In many parts of the world, direct solar radiation is considered to be one of the most prospective sources of energy. However, the large-scale utilisation of this form of energy is possible only if the effective technology for its storage can be developed with acceptable capital and running costs. One of prospective techniques of storing solar energy is the application of phase change materials (PCMs). Unfortunately, prior to the large-scale practical application of this technology, it is necessary to resolve numerous problems at the research and development stage. This paper looks at the current state of research in this particular field, with the main focus being on the assessment of the thermal properties of various PCMs, methods of heat transfer enhancement and design configurations of heat storage facilities to be used as a part of solar passive and active space heating systems, greenhouses and solar cooking.
1,173 citations
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TL;DR: A comprehensive review of the PHM field is provided, followed by an introduction of a systematic PHM design methodology, 5S methodology, for converting data to prognostics information, to enable rapid customization and integration of PHM systems for diverse applications.
1,164 citations