并联模型在测试复合保温材料有效导热系数中的应用

Parallel Connection Model for Testing the Effective Thermal Conductivity of Composite Thermal Insulation Material

以并联模型为基础,应用数学模型计算复合保温材料有效导热系数的理论值,采用防护热板法测量复合保温材料有效导热系数的试验值。将复合保温材料有效导热系数的理论值与试验值进行比较,分析各部分材料的尺寸比例对复合保温材料有效导热系数的影响,结果表明:复合保温材料有效导热系数受到各部分材料的导热系数的数值大小以及尺寸比例的影响,呈现线性关系。复合保温材料的有效导热系数理论值和试验值相对偏差范围在10%以内,证明公式在计算复合保温材料有效导热系数具有合理性,为不规则复合保温材料有效导热系数的测量提出了理论支持。

Based on the parallel connection model, the theoretical value of thermal conductivity of composite thermal insulation materials is calculated by using the mathematical model, and the experimental value of composite thermal insulation materials is measured by using the protective hot plate method. The theoretical value of the effective thermal conductivity of the composite thermal insulation material is compared with the experimental value. It’s analyzed that the effect of the size ratio of each part of the material on the effective thermal conductivity of the composite thermal insulation material. The results show that the effective thermal conductivity of the composite thermal insulation material is affected by the numerical value and the dimensional ratio of the thermal conductivity of each material, showing a linear relationship. The relative deviation between the theoretical and experimental values of the effective thermal conductivity of the composite thermal insulation material is within 10%, which proves that the formula is reasonable in calculating the effective thermal conductivity of the composite thermal insulation material.