الفهرس 
ENERGY-EFFICIENT BUILDING ENVELOPEOnly 14 pages are availabe for public view
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Abstract
ABSTRACT
The increasing energy consumption of residential buildings in Egypt, which reached about 42% of total energy consumption in the latest energy statistics, affirms the need for energy-conscious design of buildings. Research fields concentrate on the energy efficiency of new designs and constructions. The real challenge is to retrofit the existing building to limit the exhaustion of energy. This research outlined different energy retrofitting techniques led to a reduction in cooling loads via the building envelope for the existing building. This research aims to evaluate the energy retrofitting measures for buildings’ envelope in order to reduce energy consumption in a hot arid climate and propose a strategy for retrofitting an existing residential building envelope according to its economic feasibility. The energy analysis carried out by employing advanced simulation via Design Builder software for a residential building located in Cairo, This case study analyzed the performance of 3 retrofitting scenarios in a residential building façade in the different cardinal orientations each time of simulation, first scenario is changing glass type and color, the second scenario is using different types of cavity walls, the third scenario is the integration between using cavity wall and changing glass type. The model was validated by taking a field measurement to measure and quantify the temperature of a selected room taken within three consecutive days in May and June 2019 and compared to the simulation tool results; the average error percentage was 2.15%. The research also focused on the financial feasibility of the retrofitting investment compared to the return based on the quantitative results of the energy simulation. For this reason, the payback period has been calculated.