Abstract
Abstract The building sector is a large consumer of the world's energy and is responsible for 40% of the European Union's (EU) total final energy consumption. The most effective and efficient method to reduce energy consumption of buildings is to retrofit existing buildings with more energy efficient facilities. This paper presents a multi-objective optimization model for building envelope retrofit planning which aims at maximizing energy savings and economic benefits with given investment budget. It also takes thermal comfort and life-cycle impact into consideration. Results from application to the retrofit planning of a 70 years old family house show that energy consumption can be reduced effectively by the presented model.
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