Aislamientos traslucidos

Reinforced polyester roofs and natural cooling strategies (Oral Presentation)
Carlos Alberto Rincón Arch. Enrique Ortiz Arango
1

EXIPLAST S.A

2

Bogotá . Colombia

ABSTRACT: Undertropical conditions, heat exchanges trough the roof are significant if compared with other envelope components. In many cases commercial and industrial buildings require to solve either ventilation andnatural lighting needs, so the roof becomes the main cooling device. In the other hand manufacture roof process requires to develop a cost / benefit structure able to solve at the same time the user needs, bioclimatic and commercial requirements. The purpose of this paper is to show improvements on design, manufacturing and marketing process of reinforced transparent polyester roofs in order to assurean adequate bioclimatic response at affordable prices. This is essential to assure a sustainable approach under developing tropical areas like Colombia. Bioclimatic features: transparent roofs couldbe used at the same time as a ventilation and lighting device. This requires the search of specific thermal and lightning standards according to industrial and commercial conditions: light : 100 LUX ,SC : 0.20. Heat average gain / m2 : 35 W/m2 , ventilation rate to heat discharge an removal hygienic air by stack effect : 16 to 20 volumetric air changes. Actual response of transparent plasticsheets is restricted transmission factors if compared with insulated roofs. in terms of heat

So, the challenger is to reduce the actual gap between required thermal conditions specially the SC factor ,avoiding the diminution on light performances and of course market conditions focused in “good and cheap”. Consequently the research is focused in the improvement of reinforced polyester sheets intoan integrated cooling system which is a ventilated sky light with the following features: • • Opal or ice finished sheet assures a diffused light factor of 47% appropriate to industrial/ commercial...