COOLED CEILINGS/DISPLACEMENT VENTILATION HYBRID AIR CONDITIONING SYSTEM : Design criteria for both of ventilation efficiency and thermal comfort

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  • 天井冷房/置換換気ハイブリッド空調システムに関する研究 : 換気効率と熱的快適性の両立における設計条件
  • テンジョウ レイボウ チカン カンキ ハイブリッド クウチョウ システム ニ カンスル ケンキュウ カンキ コウリツ ト ネツテキ カイテキセイ ノ リョウリツ ニ オケル セッケイ ジョウケン

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This paper aims at developing an optimal design procedure of a hybrid air-conditioning system of cooled ceiling (CC) and displacement ventilation (DV) systems to meet the demand of both thermal comfort and air quality environment in the occupied zone. A series of experiments were carried out using a hypothetical office room to obtain data of vertical air temperature distribution, local ventilation efficiency and thermal comfort level affected by the various setting parameters of the air-conditioning system. Importance is stressed on the choice of CC cooling output ratio η to the vertical temperature difference of occupied zone and thermal comfort. Based on the subjective sensory experiments, optimal temperature difference of occupied zone is proposed at 2.5℃. Present work was summarized as a design diagram that can be used to determine the η value to realize the highest ventilation efficiency within acceptable range of vertical air temperature difference.

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