Comparaison des performances énergétiques de deux murs solaires aérauliques en condition réelle de fonctionnement

Abstract

Solar thermal technologies have great potential to reduce the energy consumption of buildings. Transpired solar collectors can preheat air for space heating or industrial processes. There are two principal technologies of transpired solar collectors, involving different heat transfer mechanisms. The main objective of this study is to give a performance comparison of two transpired solar collectors: one is an unglazed transpired collector (UTC), and the other one is a transparent transpired collector (TTC). An experimental set-up located in Montreal is used to study these collectors under real operating and various weather conditions during one year. The results show that, despite their different characteristics, they have similar thermal performances. Their efficiencies vary according to weather conditions and suction airflow, between 43 and 54%. A statistical study based on experimental data analyzes the influence of airflow rate, solar radiation and wind on the performance of both collectors. The results confirm that the airflow rate and the solar radiation are the most influent parameters. Wind speed also has an influence in particular on the UTC which the absorber is directly subject to weather conditions. For both collectors, wind direction is not a significant parameter. Finally, a study investigating the temperature inside the plenum collector’s shows that for high flow rates, suction is not uniform producing hot spots. The performances of the collectors are not optimal for high suction velocity. Finally, from an economic point of view, due to the low cost of energy in Quebec, the installation of these solar collectors does not give a reasonable payback time.

Date	13 Oct 2015
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Daniel Rousse (Supervisor) & Stéphane Hallé (Co-supervisor)