DIYALA JOURNAL OF ENGINEERING SCIENCES

Abstract

The present numerical and experimental study aims to specify the amount of conserved electrical energy by reducing the environment effects on the building in summer season by covering the outer surfaces wall with plates were made from reflected aluminum of [ANS H35.1(2001)] with unconventional configurations. The room model was with dimensions of (1×1×2) m located in 3rd floor of a building in Baghdad city at latitude of (33.2 No). Using 200 mm thickness thermal insulation type of styropor (polystyrene) to cover the roof, ground and three walls inside room to reducing the heat transfer through these walls. Moreover, the wall of (1×2) m under study was at orientation to the east. This room was equipped with an air-conditioning unit with capacity of (1 Ton) to provide a cold space inside the room to obtain the standard thermal condition. The temperatures were recorded on the outer and inner surfaces of the wall. The air temperatures were recorded in the shadow for one day only (from 5 am to 6 pm) through summer months of 2015. The results show that the using proposed plates reducing the electrical energy consumption for cooling purpose and obtained an improved in saving was about (43.4- 50.8)% for closed air gap case in behind it. However, when using the thermal insulation the saving was about (62.5-63.4) %. While the saving was increased when that plates painted by thermal paints the saving raised to (57-63.3) % at presence the closed air gap and the saving becomes (68-70.9) % when adding the thermal insulation.