Studies on the Effects of Improving the Thermal Environment around the Outdoor Units of Air-Conditioning System : Part1: Measurement Survey on the Short-Circuit Phenomenon around the Outdoor Units of Air-Conditioning System

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  • 空調屋外機周辺の熱環境改善とその効果に関する研究 : その1-空調屋外機のショートサーキット現象に関する実態調査
  • クウチョウ オクガイキ シュウヘン ノ ネツ カンキョウ カイゼン ト ソノ コウカ ニ カンスル ケンキュウ ソノ 1 クウチョウ オクガイキ ノ ショートサーキット ゲンショウ ニ カンスル ジッタイ チョウサ

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This study investigates from the current understanding of the short-circuit phenomenon and proposed countermeasures, to investigate the effects of the short-circuit phenomenon on energy consumption based on a measurement survey against existing buildings and a computational fluid dynamics (CFD) analysis against virtual buildings with simple shapes. This paper reviews the current knowledge of the short-circuit phenomenon, reports the results of measurement survey against air-cooled air-conditioners with an outdoor unit, the quantitative evaluation of the effects of wind on the magnitude of the phenomenon, and the effects of the phenomenon on the energy consumption of air-conditioners. As a result of this study, the short-circuit phenomenon occurred in all the outdoor units and on average caused an increase in intake temperature of 3 degrees Celsius to 4 degrees Celsius in the daytime. It was assumed that the greatest effects on the range of intake temperatures were due to differences in wind and the location of the outdoor unit. The increase in intake temperature resulted in an increase of a little more than 3% on average in the power consumption of air-conditioning units during the measurement period. However, when unit-to-unit differences were examined, some units were subject to about a 15% increase in power consumption.

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