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Multi-Objective Optimization of Building Energy Design to Reconcile Collective and Private Perspectives: CO 2 -eq vs. Discounted Payback Time

Author

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  • Mohamed Hamdy

    (Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, Byggteknisk, 2-236, Gløshaugen, Høgskoleringen 7A, Trondheim 7491, Norway
    Department of Mechanical Power Engineering, Helwan University, Cairo 11790, Egypt)

  • Gerardo Maria Mauro

    (Department of Industrial Engineering, Università degli studi di Napoli Federico II, Piazzale Tecchio 80, Naples 80125, Italy)

Abstract

Building energy design is a multi-objective optimization problem where collective and private perspectives conflict each other. For instance, whereas the collectivity pursues the minimization of environmental impact, the private pursues the maximization of financial viability. Solving such trade-off design problems usually involves a big computational cost for exploring a huge solution domain including a large number of design options. To reduce that computational cost, a bi-objective simulation-based optimization algorithm, developed in a previous study, is applied in the present investigation. The algorithm is implemented for minimizing the CO 2 -eq emissions and the discounted payback time (DPB) of a single-family house in cold climate, where 13,456 design solutions including building envelope and heating system options are explored and compared to a predefined reference case. The whole building life is considered by assuming a calculation period of 30 years. The results show that the type of heating system significantly affects energy performance; notably, the ground source heat pump leads to the highest reduction in CO 2 -eq emissions, around 1300 kgCO 2 -eq/m 2 , with 17 year DPB; the oil fire boiler can provide the lowest DPB, equal to 8.5 years, with 850 kgCO 2 -eq/m 2 reduction. In addition, it is shown that using too high levels of thermal insulation is not an effective solution as it causes unacceptable levels of summertime overheating. Finally a multi-objective decision making approach is proposed in order to enable the stakeholders to choice among the optimal solutions according to the weight given to each objective, and thus to each perspective.

Suggested Citation

  • Mohamed Hamdy & Gerardo Maria Mauro, 2017. "Multi-Objective Optimization of Building Energy Design to Reconcile Collective and Private Perspectives: CO 2 -eq vs. Discounted Payback Time," Energies, MDPI, vol. 10(7), pages 1-26, July.
  • Handle: RePEc:gam:jeners:v:10:y:2017:i:7:p:1016-:d:105054
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    References listed on IDEAS

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