强化对流式架空地板辐射采暖系统实验研究

EXPERIMENTAL STUDY OF ENHANCED CONVECTION OVERHEAD RADIANT FLOOR HEATING SYSTEM

提出一种强化对流式架空地板辐射采暖末端系统,分析该末端系统流动和传热特性。通过人工气候室实验研究,测试该系统在不同盘管运行水温、盘管间距、开孔面积等工况下,预热期、间歇期、稳定期各运行阶段地板结构蓄、放热特性。实验发现：相比于未开孔架空辐射采暖地板,开孔强化对流式架空地板表面温度和房间温度在预热期升温更快,可提前约1 h达到要求室温,且平稳状态时室温可提高2.6°C,地板表面热流密度提高约10 W/m^2;地板开孔处空气为自然对流状态,平均风速约为0.1 m/s;给出预热期和间歇期地板表面温度和热流密度的变化规律、不同间歇时长条件下预热阶段地板表面温度变化特性。实验结论可为该类架空地板采暖末端提供设计和运行依据。

An enhanced convection overhead radiant floor heating end system was proposed and the flow and heattransfer characteristics of the end system were analyzed. Through the experimental research in artificial climate chamber,the heat storage and heat release characteristics of the floor structure system during the warm-up period,the rest periodand the stable period were tested under different working conditions such as different operating water temperature of coil,coil spacing and hole opening area. The results show that comparing with the overhead radiant floor heating systemwithout hole-opening,the surface temperature and room temperature of hole-opening enhanced convection overhead floorraise faster during warm-up period,and it can meet the requirement of room temperature about one hour in advance.Besides,the room temperature can raise 2.6 ℃ during stable state and the floor surface heat flux can raise about 10 W/m-2;the air of hole-opening position is in natural convection state and the average wind speed is 0.1 m/s. The variation law offloor surface temperature and heat flux of preheating period and intermittent period,also the variation characteristics offloor surface temperature during preheating period under the conditions of different intermittent time are obtained. Theexperiment conclusion can provide the basis for design and operation of such overhead floor heating end.