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Optimization of geometry of horizontal roof overhangs during a summer season

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Abstract

This paper presents the simultaneous optimization of the depths of the horizontal roof overhangs for the design of a residential summer house for house operation during summer season in Belgrade, Serbia. The overhangs facing south, east, and west are made by using reinforced concrete. The two objective functions are used such as (1) minimizing the sum of the primary operative energy consumption during the overhang life cycle and the embodied energy in the roof overhangs and (2) maximizing the ratio of the annual primary operating energy saving and the annualized embodied energy of the applied roof overhangs. For the optimization, the Hooke-Jeeves method is used, and the EnergyPlus software is used to simulate energy behavior of the house. The research showed that two different optimizations gave different results. However, if the house is not used during the same time for which the overhangs are optimized, there is a slight increase in primary energy consumption, although the operative energy consumption may be lower.

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Acknowledgments

This paper is a result of three project activities as follows: (1) project TR33015, (2) project III 42006, and (3) KNEP-Kragujevac. The first project and second project are financed by the Ministry of Education, Science and Technological Development of the Republic of Serbia. The third project is financed by the Centre for Science of Serbian Academy of Science at University of Kragujevac and the University of Kragujevac. We would like to thank these institutions for their financial support during these investigations.

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Correspondence to Milorad Bojić.

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Bojić, M., Cvetković, D. & Bojić, L. Optimization of geometry of horizontal roof overhangs during a summer season. Energy Efficiency 10, 41–54 (2017). https://doi.org/10.1007/s12053-016-9438-7

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