摘要
To evaluate the thermal performance of a low-temperature electrical radiant floor heating system,an experimental facility equipped with a constant temperature chamber and different specimen floors is designed and built.The heating cable is installed in the floor slab with a unit-rated power of 30 W/m.Twenty-four different schemes are worked out and tested,which include three kinds of composite floor structures and eight kinds of cable distances.The cable distances are 30,40,50,60,80,100,130,150 mm.The main affective factors of the thermal performance and their influencing regularity are discussed.The experimental results show that the system has good stability and reliability,and the ratio of the radiation heat-transfer rate to the gross heat-transfer rate is greater than 50%.When the floor structure and the cable distance are fixed,the gross heat-transfer rate of the upper floor surface has a maximum value at an optimal cable distance.Under the experimental conditions in this paper,the optimal cable distance is 50 mm.
为了评价低温电地板辐射供暖系统的热力性能,设计并构建了一个由恒温小室和不同结构地板组成的实验装置.发热电缆均匀分布在地板层内,额定发热功率为30W/m.由3种不同复合地板结构和8种不同的导线间距组合成24种实验方案,分别进行测试,其中导线间距分别为30,40,50,60,80,100,130,150mm.分析了影响电地板辐射供暖系统热力性能的主要因素及其影响规律.实验结果表明,该系统具有良好的稳定性和可靠性,地板供暖辐射换热量约占总换热量的50%以上.当地板结构相同且感温探头所处位置不变时,存在一个使地板上表面散热量最大的最佳导线间距,实验工况下的最佳导线间距为50mm.
