1 Ocak 2010 Dergi makalesi Açık Erişim

Ezan, Mehmet Akif; Ozdogan, Muhammet; Gunerhan, Huseyin; Erek, Aytunc; Hepbasli, Arif

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    <subfield code="a">The main objective of this study is to investigate the energetic and exergetic performances of a latent energy storage system in both charging (solidification) and discharging (melting) processes. A shell-and-tube TES unit was designed, constructed and tested in Dokuz Eylul University, Izmir, Turkey. This experimental unit basically consisted of a heat exchanger section, a measurement system and flow control systems. For the charging mode, the inlet temperatures varied to be -5 degrees C, -10 degrees C and -15 degrees C, while the volumetric flow rates changed to be 2 l/min. 4 l/min and 8 l/min. The experiments were performed for three different tube materials, copper, steel and PE32 and two various shell diameters of 114 mm and 190 mm to investigate the tube material and shell diameter effects on energetic and exergetic efficiencies. It may be concluded that for the charging period, the exergetic efficiency increased with the increase in the inlet temperature and flow rate. For discharging period, irreversibility increased as the temperature difference between the melting temperature of the PCM and the inlet temperature of the heat transfer fluid (HTF) increased and hence the exergy efficiency increased. (C) 2010 Elsevier B.V. All rights reserved.</subfield>
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