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Analysis of Heating and Cooling Load Profile According to the Window Retrofit in an Old School Building

노후 학교건물의 창호 교체에 따른 부하분석

  • Lee, Ye Ji (Dept. of Civil, Architectural and Environmental System Eng., SungKyunKwan University) ;
  • Kim, Joo Wook (Center for Built Environment, SungKyunKwan University) ;
  • Song, Doo Sam (School of Civil, Architectural Eng., and Landscape Architecture, SungKyunKwan University)
  • 이예지 (성균관대학교 건설환경시스템공학과) ;
  • 김주욱 (성균관대학교 건설환경연구소) ;
  • 송두삼 (성균관대학교 건설환경공학부)
  • Received : 2017.07.11
  • Accepted : 2017.08.11
  • Published : 2017.09.10

Abstract

The purpose of this study is to analyze heating and cooling load variation due to envelope retrofits in an old school building. In a previous study, envelope retrofit of an old school building resulted in annual energy consumption reduction. However, cooling energy consumption increased with the envelope retrofit. This is because of high internal heat generation rates in school buildings and internal heat cannot escape through windows or walls when the envelope's thermal performance improves. To clarify this assumption, thermal performance changes due to envelope retrofits were analyzed by simulation. Results revealed indoor temperature and inner window surface temperature increased with high insulation level of windows. Indoor heat loss through windows by conduction, convection and radiation decreased and resulted in an increase of cooling load in an old school building. From results of this study, energy saving impact of envelope retrofits in an old school building may not be significant because of high internal heat gain level in school buildings. In case of replacing windows in school buildings, local climate and internal heat gain level should be considered.

Keywords

References

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