Thermal Assessment of the PTC System in Arid Algerian Regions

Abstract

In this work, the calculation was used to see the evolution of the maximum daily intensity of direct solar radiation, the duration of sunshine, and the maximum air temperature during the year in the regions of 'El Oued and Ghardaïa (Algeria). In order to choose the days when the values of these values are the lowest in each region, in order to study the evolution of the output of a cylindrical parabolic solar concentrator. We have found that less than 0.6 W/m² in maximum radiation intensity difference and 0.01 h difference in sunshine duration are sufficient to only last for two days instead of three. , the first of which is the winter solstice and the second is the fourth day of the year. We were also able to follow, during the two days of study, the evolution of the intensity of direct solar radiation, the temperature of the air, the temperature of the water leaving the solar concentrator, the quantity of heat energy absorbed, whether instantaneous or total, and finally the total heat return.

We have noticed that the shape of the evolution of the first four is generally in the form of a parabola, while the evolution of the last two is differentiated from them by their symmetry, regardless of the school day and its region. There is no significant difference between the two study areas, although the Ghardaïa region is often the highest. While the yield is higher in the valley region, the latter is not affected by a change of study day as long as there is a rapprochement between them. The highest values of these coefficients are; (697.31 W/m2, 04/01, Ghardaïa), (21.87 °C, 22/12, Ghardaïa), (54.82 °C, 22/12, Ghardaïa), (7.08 kW, Ghardaïa ), (166.41 MWD, 04/ 0 01, Ghardaïa), (81.67%, 12/22, El Oued), respectively.