Effect of Phase Change Material and Roof Shading on Cooling Load of Residential Unit in Basrah

In several countries, residential buildings are responsible for high energy consumption. The majority of is consumed on air conditioning to ensure maximum indoor comfort. Iraq, the demand electricity increases significantly, especially during summer cooling purposes. this paper, two technologies proposed reduce load. These approaches included use phase-changing materials (PCM) in different locations walls and roof, addition roof shading by galvanized iron. effects these proposals were simulated latest software tool (designbuilder) compared with standard building model. results clear when PCM was installed outer surface wall which achieved highest reduction load about 18 %. While method using corrugated iron proved its effectiveness decreasing 5 % case.