采用稳态模型的毛细管墙体热工特性研究
Steady？？State Thermal Performance of Radiant Wall Embedded with Capillary？？Tubes

为了深入研究毛细管墙体的热工特性,在非稳态传热热阻热容RC(resistance and capacity)简化模型的基础上,建立了毛细管墙体的稳态换热量分配比例模型,获得了毛细管与室内和室外换热量的比值。通过实验采集了室内外空气温度、毛细管墙体内壁面温度、毛细管层温度及毛细管与室内外交换的热流密度等实验数据,研究了冬季工况下毛细管墙体与室内外换热量的特点,分析了毛细管墙体的一维换热过程,并验证了毛细管墙体换热量分配比例模型的合理性。实验结果表明:毛细管辐射空调系统具有良好的稳定性,室内温度的波动较小;随着系统运行时间的增加,所建模型的计算值与实测结果更加趋于一致。该稳态换热量分配比例模型可应用于毛细管墙体热工特性评估,并可为进一步研究毛细管辐射空调系统室内负荷的计算提供理论依据。
To explore the performance of the wall embedded with capillary？？tubes, a scale model of heat distribution of the capillary wall is established, which delivers the ratio of heat exchange from capillary layer to both indoor and outdoor sides according to the simplified transient RC (resistance and capacity) model. The experimental data including the indoor and outdoor air temperatures, the temperature of the inner surface of the capillary wall, the temperature of the capillary layer and the heat fluxes from capillary layer to indoor and outdoor sides are collected to analyze the characteristics of the capillary wall and the heat exchange crossing indoor and outdoor sides subject to the winter conditions. The reasonability of the present scale model is verified, and the one？？dimensional heat exchange process of the capillary wall is then discussed. Experimental results show that the capillary radiant air？？conditioning system is endowed with good stability, and the fluctuation of the indoor temperature is relatively small. With the increase in the running time of the system, the calculated values of the model are more consistent with the measured results. The proposed model is capable to handily evaluate the performance of the capillary wall in actual applications and to provide a theoretical basis for the further research on indoor load calculation of the radiant air conditioning system