Modélisation unidimensionnelle d'un collecteur solaire aéraulique

Abstract

Transpired solar collectors allow air preheating. This air is drawn through a perforated plate while this plate is heated by solar radiation. When the perforated plate is semi-transparent, the wall behind it can be seen and thus the collector has an aesthetic advantage over opaque collectors. This would facilitate this type of collector acceptance and therefore reduce building energy consumption for heating. This study presents the first description of physical phenomena existing in the transpirent transpired collectors (TTC) and a formulation thereof by heat balances. To phenomena already known by the study of unglazed transpired collectors (UTC) were added transparency of the plate, absorptivity and reflectivity of the wall and the convective heat exchange at the wall. The collector is divided into sub-domains and the balances are performed on each of them, the output of one becomes the input of the other. The balances formulation is linearized so as to produce a matrix system that can be solved by inversion and iteratively. To understand the specifics of TTC with respect to UTC, we vary the plate transparency, the wall absorptivity, the suction velocity and the incident solar radiation. The results showed that the later had very little impact on the collector performance. Its influence refers to the amount of energy available. Optical parameters affect the ability to absorb this energy. Consequently, the more the plate transparency increases, the more the collector total absorptivity decreases. This decrease is even more pronounced when the wall absorptivity is low. Finally, the suction velocity determines the air ability to recover the heat absorbed by the wall and the plate. The higher this speed, the better the performance. For the modeling purpose, we conducted a number of simplifications. The first results on the optical parameters and review of these simplifications allow to establish a series of recommendations and research avenues that would complement the model and validate these numerical results.

Date	20 Nov 2013
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Daniel Rousse (Supervisor) & Stéphane Hallé (Co-supervisor)