Studies on Prevention of Mixing Energy Loss in Air-conditioned Room : Part 2-Estimation of Seasonal Energy Loss

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  • ITO Hisahiro
    Department of Architecture, Faculty of Engineering, Nagoya University
  • NAKAHARA Nobuo
    Department of Architecture, Faculty of Engineering, Nagoya University

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  • 空気調和における室内混合損失の防止に関する研究 : 第2報-期間損失発生量のケーススタディ
  • 空気調和における室内混合損失の防止に関する研究-2-期間損失発生量のケーススタディ
  • クウキ チョウワ ニ オケル シツナイ コンゴウ ソンシツ ノ ボウシ ニ カ

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Abstract

It is a serious subject for energy conservation to prevent the energy loss caused by the mixing of heated and cooled air jets in a building where different air-conditioning systems are applied in the perimeter and interior zones. In Part 1, the authors disclosed factors which had significant influences on the energy loss quantitatively by experiments with actual sized equipment, and based on those results, proposed the air-conditioning system and the operating condition effectual for prevention of the mixing loss. In this paper, the estimation equation of the amount of the mixing loss was proposed by the multiple regression analysis of all experimental results described in the previous paper as follows: MLR=31.281SPD+0.053FCH+2.469IACR-29.157 where MLR: ratio of mixing energy loss to sum of perimeter heating load and interior cooling load [%] SPD: control temperature difference between perimeter and interior zones (the latter from the former) [℃] FCH: heating load supplied by perimeter warm air jet [kcal/m・h (width of exterior wall)] IACR: air change rate in interior zone [h^<-1>] This equation can explain about 73% of the complicated phenomenon, therefore, it seems to be accurate enough for practical use. Furthermore, several estimations of the seasonal energy loss were performed for a typical office building using the dynamic heat load calculation and the above equation. According to the simulations, the effects of various operating conditions on total energy loss in the building overall in winter were clarified.

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