地面辐射供冷系统地面表面温度影响因素

Factors Affecting Floor Surface Temperature of Floor Radiant Cooling System

截取两盘管(左侧盘管为供水管,右侧盘管为回水管,回水温度比供水温度高1℃)之间的辐射地面(不考虑绝热层厚度)作为研究对象,采用Fluent软件,在填充层材料为水泥砂浆的条件下,模拟盘管中心距(分别选取80、150、220、300mm)、供水温度(分别选取12、14、16、18、20℃)、面层材料(分别选取瓷砖、木质地板)对地面表面温度(平均温度、最低温度)的影响。当供水温度为14℃,面层材料为瓷砖时,随着盘管中心距的增大,地面表面平均温度、最低温度均有所升高,综合考虑地面辐射供冷系统制冷能力、地面表面结露风险,盘管中心距宜选取220mm。当面层材料为瓷砖,盘管中心距为220mm时,随着供水温度的升高,地面表面平均温度、最低温度均有所升高,供水温度为16℃时地面辐射供冷系统地面表面结露风险比较低。当供水温度为16℃,盘管中心距为220mm时,与面层材料为瓷砖时相比,木质地板面层内温度场发生了明显变化,且地面表面平均温度、最低温度分别升高1.7、2.4℃。在对盘管中心距、供水温度进行选取时,应兼顾地面辐射供冷系统制冷能力、地面表面结露风险。随着面层材料热阻的增大,地面表面平均温度、最低温度升高,地面辐射供冷系统制冷能力下降。

Intercepting the radiant floor (regardless of the thickness of the insulating layer) between the two coils (the left coil is the supply water pipe,the right coil is the return water pipe,and the return water temperature is 1 ℃ higher than the supply water temperature) as the research object,Fluent software is used to simulate the influence of coil center distance (80,150,220 and 300 mm respectively),supply water temperature (12,14,16,18 and 20 ℃ respectively) and surface layer material (ceramic tile and wooden floor respectively) on the floor surface temperature (average temperature and minimum temperature) under the condition that the filling layer material is cement mortar. When the supply water temperature is 14 ℃,and the surface layer material is ceramic tile,the average temperature and minimum temperature of the floor surface increase with the increase of the coil center distance. Considering the cooling capacity of the floor radiant cooling system and the risk of surface condensation,the coil center distance should be selected to be 220 mm. When the surface layer material is ceramic tile,and the coil center distance is 220 mm,the average temperature and minimum temperature of the floor surface increase with the increase of the supply water temperature. The risk of floor surface condensation of the floor radiant cooling system is relatively low when the water supply temperature is 16 ℃. When the supply water temperature is 16 ℃,and the coil center distance is 220 mm,the temperature field in the wooden floor surface changes significantly compared with that the surface material is ceramic tile,and the average temperature and minimum temperature of the floor surface increase by 1.7 ℃ and 2.4 ℃,respectively. When the coil center distance and the supply water temperature are selected,the cooling capacity of the floor radiant cooling system and the risk of floor surface condensation should be taken into account. With the increase of the thermal resistance of the surface layer material,the average temperature and minimum temperature of the floor surface increase,and the cooling capacity of the floor radiant cooling system decreases.