Thermal performance analyses of a new multi-segmented minichannel-based radiant ceiling cooling panel

Energy Reports

Takao Katsura¹  Katsunori Nagano²  Ali Radwan²  Lan Ding³ 

[1] Corresponding author.;Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13-W8, Kita Ku, Sapporo 060-8628, Japan;Division of Human Environmental Systems, Graduate School of Engineering, Hokkaido University, N13-W8, Kita Ku, Sapporo 060-8628, Japan;

关键词: Minichannel;    Multi-segmented;    Ceiling radiant cooling panel;    Radiation;    Tilt angle;   

DOI  :  

来源: DOAJ

【 摘 要 】

In this study, a new multi-segmented radiant ceiling panel with different tilt angle is proposed. The effect of segments inclination angle and panel area increase for the same coverage ratio are investigated. A 3-dimension computational fluid dynamics model is developed and validated for these comparisons. It is concluded that increasing segments angle decrease the ratio between the radiation and total heat exchange. In addition, using the multi-segments allows the air to move from the plenum area to the central zone of the room. Further, the operative temperature for the ±45° is minimum with best value for the predicted mean vote and lowest value of predicted percentage dissatisfied compared with ±30°, ±75° and 90°. And increasing the panel area with 300% increased the panel cooling capacity by around 140% for the same indoor temperature of 25.3±0.2°C and the same ceiling area. This research found that the cooling capacity is proportional to the area of the radiant panel, but under the same ceiling area, when the area ratio exceeds a certain value, the thermal performance will decrease due to the reduction of the convection heat transfer coefficient.

【 授权许可】

Unknown