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Changes in year-round air temperature and annual energy consumption in office building areas by urban heat-island countermeasures and energy-saving measures

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  • Ihara, Tomohiko
  • Kikegawa, Yukihiro
  • Asahi, Kazutake
  • Genchi, Yutaka
  • Kondo, Hiroaki

Abstract

This paper describes the effects of the installation of various countermeasures against urban heat-island (UHI) and energy-saving measures on UHI and global warming. A UHI and energy-consumption simulation model was developed by combining the one-dimensional meteorological canopy and building energy use models; further, the proposed model was expanded to evaluate the year-round air temperature and annual energy consumption. The simulation results showed that the humidification and albedo increase at building-wall surfaces reduced the total number of hours for which the air temperature was more than 30 °C during the daytime by more than 60 (h) per year. The UHI countermeasures reduced the annual energy-consumption despite causing a small increase during the winter period. However, they may result in certain unfavorable conditions for pedestrians. Energy-saving measures, on the other hand, reduce the total number of hours for which the air temperature is more than 30 °C by only a few hours per year. Thus, we demonstrate the effectiveness of the UHI countermeasures and measures against global warming by extending the calculation period from summer to an entire year.

Suggested Citation

  • Ihara, Tomohiko & Kikegawa, Yukihiro & Asahi, Kazutake & Genchi, Yutaka & Kondo, Hiroaki, 2008. "Changes in year-round air temperature and annual energy consumption in office building areas by urban heat-island countermeasures and energy-saving measures," Applied Energy, Elsevier, vol. 85(1), pages 12-25, January.
    • Handle: RePEc:eee:appene:v:85:y:2008:i:1:p:12-25
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    1. Kikegawa, Yukihiro & Genchi, Yutaka & Kondo, Hiroaki & Hanaki, Keisuke, 2006. "Impacts of city-block-scale countermeasures against urban heat-island phenomena upon a building's energy-consumption for air-conditioning," Applied Energy, Elsevier, vol. 83(6), pages 649-668, June.
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