We investigated the concept of NZEB and applied it to a case study of a 100 m2 home in Beirut weather using Ecotect software. A number of passive design strategies, including building envelope, orientation, glazing, and shading, will be studied in the first segment to optimize the building’s energy efficiency. In the second segment, a renewable energy source will be used to cover the remaining load necessary to meet the NZEB criteria. Our research indicates that 192.5？ is the optimal facade orientation to minimize solar gains throughout the summer. Double walls measuring 10 cm with a 4 cm air gap make up the perfect wall envelopes. The results of the glazing and shading study showed that windows with a timber frame, a low E coat, and an overhanging west fa？ade with a 6 mm air gap would all help to lower the energy needed. 46% of the savings were realized.
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