毛细吸液芯冷却顶板流动阻力及制冷特性

基于现有空调系统耗能高，舒适性不够均匀，提出了多孔介质柠檬酸钾-石膏配制而成的毛细吸液芯辐射-冷却顶板，在用水作冷却介质时毛细吸液芯辐射-冷却顶板就成了一块内含多孔介质的均布流道。对以多孔介质孔隙率为55.3%的毛细吸液芯为例，水作为载冷剂流过毛细吸液芯冷却顶板进行了实验研究。介绍了毛细吸液芯冷却顶板的结构和内部配置，并通过搭建实验模型在维持室内温度（26±1）℃分布的情况下对其换热量进行了测试,分析了不同流量条件下流量与阻力的关系。结果表明，在冷水进口温度为10～16℃的条件下，相比常规蛇形辐射管，制冷量提高了36.6%～57.7%，当水流量从4 L·h^-1变化到28 L·h^-1时，黏性力减弱，摩擦因子逐渐减小，渗透率逐渐增大，但当流量从28 L·h^-1变化到40 L·h^-1时，渗透率开始减小。

Resistance and cooling performance of ceiling cooling panel of capillary porosity wick

Since conventional air-conditioning consumes more energy and the temperature in a room is non-uniform,a new ceiling cooling panel of capillary porosity wick(CCPCPW),which is configured by porous media of potassium citrate-gypsum,is used when water is the cooling medium.The CCPCPW with porosity of 55.3% was studied experimentally.The structure and different configurations of CCPCPW were presented and the cooling performance was tested when maintaining the indoor temperature distribution at(26±1)℃,and the relationship of flow rate and resistance was analyzed.The results show that the cooling capacity of the CCPCPW is increased by 36.6%—57.7% when the inlet temperature of cooling water is 10—16℃.The viscous force and friction factor gradually decrease and the permeability increases when the flow rate of cooling water is within 4—28 L·h-1,but the permeability is decreased when the flow rate is within 28—40 L·h-1,which indicates that the local resistance of curve part of pore channel is increased because of higher flow velocity.