Experimental investigation of a packed bed thermal energy storage system
CASCETTA, MARIO;CAU, GIORGIO;PUDDU, PIERPAOLO;
2015-01-01
Abstract
In this work experimental investigations on a thermal energy storage system with a solid material as storage media and air as heat transfer fluid will be presented. The experimental test rig, installed at the DIMCM of the University of Cagliari, consists of a carbon steel tank filled with freely poured alumina beads that allows investigations of heat transfer phenomena in packed beds. The aim of this work is to show the influence of the operating conditions and physical parameters on thermocline formation and, in particular, the thermal behaviour of the thermal energy storage for repeated charging and discharging cycles. Better charging efficiency is obtained for lower values of mass flow rate and maximum air temperature and for increasing aspect ratio. A decreasing influence of the metal wall with continuous operation is also highlighted. In conclusion, the analysis focuses on the thermal hysteresis phenomenon, which causes degradation of the thermocline and the reduction of the energy that can be stored by the accumulator as the repeated number of cycles increases.File | Size | Format | |
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CI_2015_UIT_CA-CA-PU-SE - Versione su Atti.pdf Solo gestori archivio
Description: Articolo principale
Type: versione pre-print
Size 1.85 MB
Format Adobe PDF
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1.85 MB | Adobe PDF | & nbsp; View / Open Request a copy |
CI_2015_UIT_CA-CA-PU-SE - Versione Modificata.pdf Solo gestori archivio
Type: versione post-print
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610.86 kB | Adobe PDF | & nbsp; View / Open Request a copy |
RI_2015_JP-CS_CA-CA-PU-SE.pdf open access
Description: Articolo principale
Size 2.35 MB
Format Unknown
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2.35 MB | Unknown | View/Open |
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