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DOI: 10.1615/ICHMT.2009.CONV.810
15 pages

Mejdi Hazami
Laboratoire de Maitrise et des Technologies de l’Energie, Technopole de Borj Cedria, Tunisia

Sami Kooli
Research and Technology Center of Energy, Thermal Processes Laboratory, Hammam Lif, B.P. 95, 2050 Tunis, Tunisia

Meriem Lazaar
Laboratoire de Maitrise et des Technologies de l’Energie, Technopole de Borj Cedria, Tunisia

Abdelhamid Farhat
Laboratoire de Maitrise et des Technologies de l’Energie, Technopole de Borj Cedria, Tunisia

Ali Belghith
Faculte des Sciences de Tunis, Laboratoire des Transferts de Chaleur et de Masse, Campus Universitaire, 1060 Tunis, Tunisia


This paper deals with a numerical and experimental investigation of a daily solar storage system conceived and built in Laboratoire de Maitrise des Technologies de l’Energie (LMTE, Borj Cedria). This system consists mainly of the storage unit connected to a solar collector unit. The storage unit consists of a wooden case with dimension of 5 m3 (5m × 1m × 1m) filed with fin sand. Inside the wooden case was buried a network of a polypropylene capillary heat exchanger with an aperture area equal to 5 m². The heat collection unit consisted of 5 m² of south-facing solar collector mounted at a 37° tilt angle. In order to evaluate the system efficiency during the charging period (during the day) and discharging period (during the night) an energy and exergy analyses were applied. Outdoor experiments were also carried out under varied environmental conditions for several consecutive days. Results showed that during the charging period, the average daily rates of thermal energy and exergy stored in the heat storage unit were 400 and 2.6 W, respectively. It was found that the net energy and exergy efficiencies in the charging period were 32 % and 22 %, respectively. During the discharging period, the average daily rates of the thermal energy and exergy recovered from the heat storage unit were 2 kW and 2.5 kW, respectively. The recovered heat from the heat storage unit was used for the air-heating of a tested room (4m × 3m × 3m). The results showed that 30 % of the total heating requirement of the tested room was obtained from the heat storage system during the whole night in cold seasons.

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