Determination of the Air/Fiber Conductivity of Mineral Wool Insulations in Building Applications Using Nonlinear Estimation Methods

作者：Veiseh S^*; Hakkaki Fard A; Kowsary F

来源：Journal of Building Physics, 2009, 32(3): 243-260.

DOI：10.1177/1744259108099431

• radiation
• conduction
• parameter estimation
• inverse method
• mineral wools

The limitation of the experimental methods in determining the thermal conductivity due to the air/fiber conduction in mineral wools leads the use of inverse parameter estimation techniques. However, in some circumstances, the convergence of the inverse solution is impossible due to the correlation of the involving parameters and the existing noises in measurement data. In this article two relations are obtained to model thermal conductivity of the air/fiber conduction k(T, rho), for glass fiber and rock wool insulations in temperatures between 0 degrees C and 20 degrees C. commonly encountered in building applications. Levenberg Marquardt's (LM) method is used for estimating of the unknown parameters in this article. Considering the nonlinear nature of the inverse problem and the correlation of the involving parameters and the existing noises in measurement data, the convergence of the problem is acceptable. The results obtained by the estimated parameters agree extremely well with experimental measurements of the Heat Flow Meter (HFM) apparatus conducted at the Building and Housing Research Center (BHRC).

• 出版日期2009-1