新型无梁楼盖磷石膏复合空腔层模盒保温隔热性能试验研究

Study on Heat Insulation Performance of a New Type Phosphogypsum Cavity Mold Box for Beamless Floor

磷石膏空腔模无梁楼盖作为一种新型建筑楼盖结构形式,兼具建筑维护和结构功能。由于楼盖内部含有较多封闭空腔,在不影响建筑结构的正常使用条件下,封闭空腔中的空气减轻了楼盖整体的自重,同时减少了热量的传播,比传统的现浇混凝土实心楼盖拥有更好的保温隔热性能。通过分析计算和FLUENT模拟发现,当封闭空腔内空气层厚度小于等于20 mm时,基本不发生对流换热,基于此提出新型无梁楼盖磷石膏复合空腔层模盒。通过稳态传热试验,测定了高度300 mm的新型磷石膏模盒总热阻和传热系数,并将新型磷石膏模盒试验数据与相同工况下现有常用同规格磷石膏模盒试验数据进行比较。结果表明,在相同工况下,新型磷石膏复合空腔层模盒保温隔热性能显著优于传统单空腔模盒。

As a new type of building floor structure,phosphogypsum cavity model beamless floor has both architectural maintenance and structural functions.As there are many closed cavities in the floor,the air in the closed cavity can reduce the overall dead weight of the floor and reduce the heat transmission without affecting the normal use of the building structure,which has better thermal insulation performance than the traditional cast-in-place concrete solid floor.Through the analysis and calculation and fluent simulation,it is found that when the thickness of air layer in the closed cavity is less than or equal to 20 mm,there is no nearly convective heat transfer.Based on this,a new type of phosphogypsum composite cavity layer mold box for beamless floor is proposed.Through steady-state heat transfer test,the total thermal resistance and heat transfer coefficient of the new type of phosphogypsum mold box with a height of 300 mm were measured,and the test data of the new type of phosphogypsum mold box were compared with those of the existing phosphogypsum mold boxes with the same specifications under the same working conditions.The results show that the thermal insulation performance of the new mold box with multiple air layers in series is significantly better than that of the traditional single cavity mold box under the same working conditions.