Influence of an absorbers GEM PEHD thermal properties on the propagation of heat in a solar sensor

• Published in: MATEC web of conferences 2018, Vol.149, p.2046
• Main Authors: Nassim, Baba Ahmed, Khaled, Aliane, Abderrahim, Benmoussat
• Format: Article
• Language: English
• ISSN: 2261-236X; 2261-236X
• DOI: 10.1051/matecconf/201814902046

This paper presents an experimental study to measure some physic-chemical properties of a high-density polyethylene geomembane (GEM PEHD ) in a temperature range from 300 K to 400 K. The results will yield a dependency between temperature and its properties in order to study an energy and process the thermal aging GEM PEHD on the solar collector. In the energy study, we solve the nonlinear equation of unsteady heat with as main non linearity influence of different properties GEM PEHD on the solar collector and one notes that the GEM PEHD presented a maximum exchange Thermal characterized by high absorption and low reflection. Thus, increasing the power absorbed by the GEM PEHD increases its temperature and the useful power received by the air and then the air temperature. Overall losses increase with the increase of the temperature difference between the GEM PEHD and windows and this increases the efficiency of the solar collector and minimize the entropy of the system. Then the study of thermal aging is dedicated to the interpretation of various analyses on GEM PEHD before and after its use in the solar collector. The thermal aging GEM PEHD in the air is a physical loss and chemical consumption immediately followed by a brutal oxidation of the polymer. The losses would be governed primarily by the chemical consumption of antioxidants. After various tests, we conclude that the value of using the GEM PEHD as absorber in the solar collector is doubly beneficial. First, given its very attractive cost compared to other as efficient absorbers (such as metals) gives good thermal performance of the solar collector even reaching 72%. While the life of the GEM PEHD is rather long (several years).