地板送风空调系统静压箱热衰减特性  

Thermal decay in supply air plenum of underfloor air distribution system

作　　者：张恺[1] 张小松[1] 李舒宏[1] 

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《东南大学学报（自然科学版）》2015年第4期720-727,共8页Journal of Southeast University：Natural Science Edition

基　　金："十二五"国家科技支撑计划资助项目(2011BAJ03B05)

摘　　要：为研究地板送风空调系统中地板静压箱的热衰减特性,首先提出静压箱的热衰减系数的概念,该系数可以用来反映整个房间的得热量中传入静压箱的比例,而该部分传热量正是造成静压箱内产生热衰减的直接原因.然后,通过实验得出地板静压箱内的温度分布特性,并结合盒形图分析影响静压箱热衰减特性的主要因素.最后,得出送风温度、送风量和送风末端形式等因素对静压箱热衰减特性的影响规律.研究结果表明:地板静压箱内的热衰减随着送风温度的升高或者送风量的降低而降低.另外,与采用旋流散流器的地板送风空调系统相比,系统采用多孔板或格栅板作为送风末端时,静压箱的热衰减现象将明显减弱,但静压箱的热衰减系数的变化规律却基本相同.The coefficient of thermal decay is proposed to study the principle of the thermal decay in the underfloor supply air plenum （USAP） of the underfloor air distribution （UFAD） system. The ratio of the heat transfer from the room to the USAP can be derived from the coefficient of thermal decay, and the thermal decay in the USAP is mainly caused by the heat transfer from the room to the USAP. The distribution of the temperatures in the USAP is analyzed by the experiments, and the main influence factors are discussed with the box-plots. Then the effects of the supply air tempera- ture, airflows, and type of diffusers on the thermal decay in the USAP are concluded. The results show that the thermal decay in the USAP is reduced with the increase of the supply air temperature and the decrease of the airflows. In addition, the thermal decay in the UFAD system with perforated tiles or grille diffusers is lower than that in the UFAD system with swift diffusers, but the changes of coefficient of thermal decay are similar for the systems.

关 键 词：地板送风 空调系统 地板静压箱 热衰减 

分 类 号：TU831[建筑科学—供热、供燃气、通风及空调工程]