Research On Thermal Insulation Performance Of New Type Beamless Floor Phosphogypsum Cavity Mould Box

As a new type of building floor structure,the phosphogypsum cavity mold beamless floor has both building maintenance structure and structural function.Due to the floor contains multiple modes empty box,compared with concrete slab solid floor,empty anticross between boxes in the air reduced the floor and the whole structure of self-respect,phosphogypsum empty anticross between floor as retaining structure at the same time reduced the heat transfer between indoor and outdoor,than the traditional cast-in-situ concrete solid floor with better thermal insulation performance.The material used in the phosphogypsum cavity mould box has a low thermal conductivity and an air layer in the middle.Reasonable optimization will improve the thermal insulation performance of the cavity mould box.Through analysis and calculation and Fluent finite element software numerical simulation,it is found that when the thickness of the air layer in the closed cavity is less than or equal to 20 mm,there is basically no convection heat transfer in the air in the cavity.Based on this,a new type of phosphogypsum cavity mould box with unbeamed floor is proposed.Through the analysis of the structure characteristics and geometric dimensions of the new type of die box,the stainless steel die used in the production of the new type of die box was designed.Through a custom stainless steel finish making new phosphorus gypsum mould box mold,using the coefficient of thermal conductivity tester for determination of the coefficient of thermal conductivity of phosphogypsum,through building palisade structure heat preservation and heat insulation performance testing device and the multichannel temperature heat flux tester determination of new type of heat transfer coefficient of phosphorus gypsum mould box,and new type of phosphorus gypsum mould box test data with the same working conditions existing commonly used phosphorus gypsum mold box of comparing the experimental data.Fluent finite element software was used to simulate the existing common die boxes and new die boxes with height of 300 mm.The total thermal resistance theory was used to analyze the thermal insulation performance of the two kinds of floor structures,and the thermal insulation performance was evaluated by equivalent thermal resistance.Through experimental research and numerical simulation analysis,it is found that the thermal resistance of the new type of phosphogypsum cavity mold with multiple air layers in series is larger than that of the traditional cavity mold under the same working condition.The heat transfer coefficient is smaller than the traditional phosphogypsum cavity mold box.The new type of phosphogypsum cavity mould has better thermal insulation performance than the conventional phosphogypsum cavity mould.