パッケージ型空気調和機を用いた対流・輻射併用型空調システムの計画手法と性能検証

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  • DESIGN METHOD AND PERFORMANCE VERIFICATION OF CONVECTION AND RADIATION AIR-CONDITIONING SYSTEM WITH PACKAGE AIR CONDITIONER SYSTEM
  • パッケージ型空気調和機を用いた対流・軸射併用型空調システムの計画手法と性能検証
  • パッケージガタ クウキ チョウワキ オ モチイタ タイリュウ ・ ジクシャ ヘイヨウガタ クウチョウ システム ノ ケイカク シュホウ ト セイノウ ケンショウ

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 In recent years, performance required for the thermal environment during building is diversified. Along with it, the air-conditioning system is desired with a new value. In addition to the convection air conditioning systems, radiation air-conditioning system has increased. Radiation air conditioning is a system that has a lot of merit. But challenges are many. We were developed a new air conditioning system - convection and radiation air-conditioning system with package air conditioner system - (dual air conditioning system).<br> Dual air conditioning system utilizing a ceiling aluminum punching metal. The aperture ratio of the punching metal, to control the two functions (convection and radiation). The system the following characteristics are expected.<br> (1)High comfort (2)Powerful heat load processing (3)Control of the fine airflow (4)Prevention of water leakage (5)Early rise of air conditioning (6)Low cost<br> We have analyzed by CFD in the design planning stage. We examined the size of the ducts, placement and size of the duct opening, the aperture ratio of the ceiling panel by CFD. As a result, the diffusion of the air flow by punching panel could be confirmed. During the cooling, wind speed is small and the unevenness is a little. During the heating, warm air is lowered to the occupied zone. However, the difference of the blowing amount between the duct front and back becomes a problem.<br> We have measured the actual building two times in the summer and winter. During the cooling, room temperature became a target temperature at 30 minutes after the start of operation. Vertical temperature difference between the occupied zone is ΔT=1.0K and small. Although large temperature difference in the ceiling, the temperature is decreased in the occupied zone. This is the effect of air diffusion by punching panel. From thermal image, it was confirmed that the room is uniformly cooled. At the time of the air conditioning operation, PMV is within ±0.2, it mean a high comfort. Ceiling panel functions as a radiation surface. In addition, the panel surface temperature is always greater than 22 °C, there is no possibility of condensation.<br> During the heating, room temperature became a target temperature at 70 minutes after the start of operation. Vertical temperature difference between the occupied zone is ΔT=1.0K since the room temperature is stable. The supply air in the ceiling is sufficiently diffused. A large difference between the ceiling panel and the room temperature, a strong effect due to radiation. The rise of the air conditioning early in the effect of radiation. PMV is -0.1 to +0.2, and a high comfort.<br> In conclusion, the convection and radiation air-conditioning system, with a simple equipment systems and heterogeneous architectural design, are to form a homogeneous comfortable environment.

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