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Balghouthi M.,Center Des Recherches Et Des Technologies Of Lenergie Crten | Chahbani M.H.,Institute Superieur Des Science Appliquees Et Of Technology Of Gabes Issatg | Guizani A.,Center Des Recherches Et Des Technologies Of Lenergie Crten
Applied Energy | Year: 2012

In this paper, we present a solar cooling installation located at the Center of Researches and Energy Technologies (CRTEn), in Bordj-Cédria, Tunisia. It is composed mainly of parabolic trough solar collectors, a 16kW LiBr double effect absorption chiller associated with a cooling tower, a backup heater, two tanks for storage and drain-back storage and a set of fan-coils installed in the building to be conditioned. The system was run in the summers 2008 and 2009 using a water solution as heat transfer medium (HTF) without storage. In summer 2010, thermal oil was used as a HTF instead of water and two tanks were added, one for temperatures stabilities and the other one as a backup tank for night storage. Two running strategies of the installation were adopted; starting with or without backup heater. The site specifications, the building loads, the chillier temperatures and heat flows, the parabolic trough solar collector efficiencies, the installation powers and performances were analyzed. It was found that the coefficient of performance COP was ranged between 0.8 and 0.91 during the installation running while the solar coefficient of performance SCOP was between 0.1 and 0.43. The maximum output of the absorption chiller was around 12kW. The drain backup night storage has improved the average solar fraction SF of the system which increased from 0.54 to 0.77. The avoided CO2 emission during a cooling season was estimated to be about 3000kg corresponding to an equivalent energy saving of 1154l of gasoil. © 2012 Elsevier Ltd. Source


Khalifa M.,Center Des Recherches Et Des Technologies Of Lenergie Crten | Hajji M.,Center Des Recherches Et Des Technologies Of Lenergie Crten | Hajji M.,Institute Superieur Delectronique Et Of Communication Of Sfax Isecs | Ezzaouia H.,Center Des Recherches Et Des Technologies Of Lenergie Crten
Nanoscale Research Letters | Year: 2012

Porous silicon has been prepared using a vapor-etching based technique on a commercial silicon powder. Strong visible emission was observed in all samples. Obtained silicon powder with a thin porous layer at the surface was subjected to a photo-thermal annealing at different temperatures under oxygen atmosphere followed by a chemical treatment. Inductively coupled plasma atomic emission spectrometry results indicate that silicon purity is improved from 99.1% to 99.994% after annealing at 900 °C. © 2012 Khalifa et al. Source


Slama S.B.,Center Des Recherches Et Des Technologies Of Lenergie Crten | Hajji M.,Center Des Recherches Et Des Technologies Of Lenergie Crten | Hajji M.,Institute Superieur Delectronique Et Of Communication Of Sfax Isecs | Ezzaouia H.,Center Des Recherches Et Des Technologies Of Lenergie Crten
Nanoscale Research Letters | Year: 2012

Porous silicon layers were elaborated by electrochemical etching of heavily doped p-type silicon substrates. Metallization of porous silicon was carried out by immersion of substrates in diluted aqueous solution of nickel. Amorphous silicon thin films were deposited by plasma-enhanced chemical vapor deposition on metalized porous layers. Deposited amorphous thin films were crystallized under vacuum at 750 °C. Obtained results from structural, optical, and electrical characterizations show that thermal annealing of amorphous silicon deposited on Ni-metalized porous silicon leads to an enhancement in the crystalline quality and physical properties of the silicon thin films. The improvement in the quality of the film is due to the crystallization of the amorphous film during annealing. This simple and easy method can be used to produce silicon thin films with high quality suitable for thin film solar cell applications. © 2012 Ben Slama et al. Source


Sabek S.,Center Des Recherches Et Des Technologies Of Lenergie Crten | Ben Nasr K.,National School of Architecture | Chouikh R.,Institute Superieur Of Mathematiques Appliquees Et Dinformatique Ismai | Guizani A.,Center Des Recherches Et Des Technologies Of Lenergie Crten
Journal of Physics: Conference Series | Year: 2015

The comparison between the experimental and theoretical simulations of a desiccant cooling system under various climatic conditions (outdoor temperature and relative humidity) on the system performance has been presented. The performance of the system is evaluated using Cooling Capacity (CC) parameter. The system under a typical summer day of hot and humid climate was tested. A remarkable decrease about 40-65% in the specific humidity and with a supply air temperature lower than 25°C of the proposed system was observed. The study is important and helpful to improve the effectiveness of this kind of liquid desiccant system in hot and humid places. Source

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