间歇供暖地板放热特性研究
Heat release characteristics of intermittent heating floor
摘要：
利用理论分析、数值计算与实测验证相结合的方法，对间歇期地板放热特性进行了研究，分析了盘管水温、填充层厚度、管间距对地板放热特性的影响。结果表明，间歇约2 h后，地板二维传热过程已经可近似为沿竖向的一维传热过程；20 h后可认为放热过程近似结束；盘管运行水温和管间距对放热特性影响较小，填充层厚度影响较大；地板总放热量折合平均热流密度约为20～35 W/m2；数值计算与实测结果误差在7%以内。
Abstract：
Studies the heat release characteristics of floor in the intermittent period by means of theoretical analysis, numerical simulation and verification by field measurement, and analyses the influences of water temperature in coil, thickness of filling layer and coil spacing on heat release characteristics. The results show that during the intermittent operation, the two-dimensional heat transfer of floor can be approximately considered as one-dimensional vertical heat transfer process after about two hours; the heat release process can be approximately considered as ended after twenty hours; the water temperature in coil and coil spacing have less effects on heat release characteristics, and the thickness of filling layer has larger impact; the average surface heat flow density obtained from the total floor heat release is 20 to 35 W/m2; and the error between the numerical calculation result and the test result is no greater than 7%.
Keywords:intermittent heating, floor radiant heating system, heat release characteristic, water temperature in coil, thickness of filling layer, coil spacing