Trade-off Analysis between Economy and Environment for Optimal Renewal Planning of an Air-Conditioning System

DOI Web Site 6 References
  • YOSHIDA Shu
    Energy Use Research and Development Center, Kansai Electric Power Co., Inc.
  • ITO Koichi
    Advanced Research Institute for Science and Engineering, Waseda University
  • AMANO Yoshiharu
    Advanced Research Institute for Science and Engineering, Waseda University
  • HASHIZUME Takumi
    Advanced Research Institute for Science and Engineering, Waseda University

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  • 空調システムの最適更新計画における経済性と環境性のトレードオフ分析
  • クウチョウ システム ノ サイテキ コウシン ケイカク ニ オケル ケイザイセイ ト カンキョウセイ ノ トレードオフ ブンセキ

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Abstract

In this paper, based on the multi-objective optimization approach, a renewal planning method is proposed for an air-conditioning system, by which the optimal renewal system can be determined by selecting the optimal renewal year and the system's structure from both economic and environmental viewpoints simultaneously. In this method, one objective function is the average annual total cost of the system, which is the summation of the annual capital, operational and maintenance costs based on the annualized cost method during the evaluation years. The other objective function is the average annual total amount of CO_2 emission during the evaluation years. The numerical optimal solution is derived for the system of an office building by the mixed-integer linear programming algorithm together with the ε-constraint method. As a result, the set of Pareto optimal solutions is derived, and the trade-off relationship between economy and environment is analyzed. Through the result of the set of Pareto optimal solutions, tolerating the increase of the average system's annual total cost up to 1%, we can reduce the average amount of CO_2 emission from the system up to 15%. One another main result obtained shows that it is necessary to introduce electrically-driven heat pump to reduce CO_2 emission.

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