Jayasuriya, JPWAttalage, RA2019-06-282019-06-28http://dl.lib.mrt.ac.lk/handle/123/14496The role of thermo-physical and geometrical characteristics of a building envelope that plays in the air-conditioning load of the commercial sector is highlighted. A standard methodology of quantifying a performance index for the building envelope is reviewed and upgraded orporating local climatic, material and architectural features. The methodology which is a trade-off between prescriptive and performance criteria can be easily used to form a basis for efficiency building code (EEBC) for Sri Lanka. The methodology is illustrated through a case studyenArticle-Full-textDepartment of Mechanical EngineeringN2883