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Correlation between the local climate and the free-cooling potential of latent heat storage
Medved, Sašo (Author), Arkar, Ciril (Author)

URLURL - Presentation file, Visit http://dx.doi.org/10.1016/j.enbuild.2007.03.011 This link opens in a new window

Abstract
The natural cooling of energy-efficient buildings using latent heat thermal energy storage (LHTES) that is integrated into the building services makes possible energy savings and improved thermal comfort. In this article, studiesof the free-cooling potential for different climatic locations are presented. Six cities from around Europe with a wide range of climatic conditions were selected. The size of the LHTES was optimized on the basis of the calculated cooling degree-hours. First, we analysed the influence of the width of the phase change temperature range and determined the optimal meltingtemperature of the phase change material (PCM). Then, the optimal LHTESwas selected, based on the ratio of the mass of the PCM and the volume flow rate of air ventilating the building. We found that the optimum PCM has amelting temperature that is approximately equal to the average ambient air temperature in the hottest month, and that the free-cooling potential is proportional to the average daily amplitude of the ambient airćs temperature swings. For all the analysed climatic conditions the PCM with a wider phase change temperature range (12 K) was found to be the most efficient. The optimal size of the LHTES for the free cooling of buildings is between 1 and 1.5 kg of PCM per m3/h of fresh ventilation air.

Language:English
Keywords:fazno spremenljivi materiali, toplotna energija, shranjevanje energije, mikroklimatski sistemi, hladilni potenciali, pasivne hiše, thermal storage systems, latent heat storage, phase change material, free cooling, cooling potential, local climate
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2008
Number of pages:str. 429-437
Numbering:Letn. 40, št. 4
UDC:697:536.7
ISSN on article:0378-7788
COBISS.SI-ID:10337307 Link is opened in a new window
Views:650
Downloads:326
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Record is a part of a journal

Title:Energy and buildings
Shortened title:Energy build.
Publisher:Elsevier
ISSN:0378-7788
COBISS.SI-ID:25395200 This link opens in a new window

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