Document Type : Research Article

Authors

• Regragui sarah ¹
• Maouedj Rachid ²
• Benatillah Ali ³
• Marif yacine ⁴

¹ University of Ahmed DRAIA Adrar

² Renewable Energy Research Unit in the Saharan Environment URERMS. Adrar, Algeria

³ Energy, Environment and Information Systems Laboratory Ahmed Draïa University. Adrar, Algeria

⁴ New and Renewable Energy Development Université Kasdi Merbah.Ouargla Algeria

Abstract

This study presents both experimental and simulation-based analyses of an affordable, compact parabolic trough collector designed for water heating in the arid Saharan climate of Adrar, southern Algeria. Experiments were conducted in June under peak solar irradiation of approximately 800 W/m². A transient one-dimensional model grounded in energy balance equations and an implicit finite difference scheme was developed and validated against experimental data, showing a maximum deviation below 5%. The collector achieved a peak thermal efficiency of about 80% at solar noon, while daily experimental efficiency ranged from 55% to 75%. At a debit rate of 0.1 kg/s, the temperature of expulsed water approached approximately 75°C however, it declined at elevated flow rates owing to the decrease staying duration of the liquid incorporated in the system. These results confirm that lower mass flow rates enhance thermal performance. Furthermore, this work provides a rare experimentally validated transient model for compact PTC systems operating under extreme Saharan conditions, where high ambient temperatures significantly influence heat-loss mechanisms, thereby supporting improved concept and enhancement of small-scale solar thermal setups in arid regions.

Keywords

• Parabolic trough collector
• Water heating
• Saharan climate
• Thermal efficiency
• Experimental validation
• Finite difference