ペリメータにチルドビームを配置した天井放射空調システムの冷却性能検証

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  • STUDY ON COOLING PERFORMANCE OF CEILING RADIANT COOLING PANEL SYSTEM WITH PERIMETER CHILLED BEAM
  • ペリメータ ニ チルドビーム オ ハイチ シタ テンジョウ ホウシャ クウチョウ システム ノ レイキャク セイノウ ケンショウ

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 Energy conservation technology has been in high demand in relation to efforts to realize (net) zero-energy buildings (ZEBs). Ceiling radiant cooling panel systems represent a key energy-conservation technology which can yield high efficiency, since it uses moderately cold water (16－18°C), offers integration with other energy-efficient strategies, such as indirect evaporative cooling or ground source heat pumps, and does not require energy to propel a fan to remove the cooling load. Furthermore, a radiant ceiling cooling panel system provides greater comfort to occupants because it does not produce a draught. Therefore, ceiling radiant cooling panel systems can offer both reductions in cooling energy consumption and a comfortable environment for occupants.<br> However, there are several problems with applying a ceiling radiant cooling system in Japan. Firstly, there is limited data about the cooling performance of such systems because few have been constructed in Japan. For this reason, it is important to determine the cooling performance of radiant ceiling panels. Secondly, radiant ceiling panels have limited cooling performance, so it is necessary to consider a special system to remove the perimeter load. Thirdly, an outdoor air-conditioning system is needed to provide outdoor air to occupants. The objective of this paper is to present an outline of the proposed system, results of the thermal performance tests in an experimental facility, and the operational performance in a building to which the proposed system is applied.<br> The proposed system consists of ceiling radiant cooling panels, perimeter chilled beams, and an outdoor-air supply system. The ceiling radiant cooling panels remove the interior cooling load. The perimeter chilled beams remove the perimeter cooling load. The outdoor-air supply system has a personal floor diffuser, a perimeter linear diffuser and a return-air inlet near the window top. The return-air inlet removes the hot air from the window to remove the perimeter load efficiently.<br> An experimental facility for the proposed system was constructed, and thermal performance tests were performed. The results show a vertical temperature differential of less than 0.5°C, and the perimeter chilled beam can remove the peak summer cooling load appropriately. The cooling capacity of the ceiling radiant cooling panels and perimeter chilled beams are approximately 80 W/m2 and 120 W/m2 respectively under conditions whereby the difference in temperature between the water input and output is 9.0°C.<br> Measurement of the system was performed in the actual building to which the system was applied. The results show that the ceiling radiant cooling panels and chilled beams can be controlled to remove varying cooling loads. The cooling capacity of the ceiling radiant cooling panels and chilled beams in the actual building proved almost equal to the experimental data. Thus, it is demonstrated that the proposed system can remove the cooling load as expected.

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