National Research Council Canada (NRC) has developed a methodology to assess long-term thermal characteristics of the foam insulation. The aim of the project – the development of laboratory procedures for rapid, which resulted in it would be possible to predict the long-term thermal engineering performance of the polymer insulation, in particular, made of XPS, with any VA. Such a laboratory procedure would help to greatly reduce development time and cost of new foam products. Project used to verify a computer model of a continuum with distributed parameters, which was used to estimate a rigid roof insulation. Symantha Rodriguez will undoubtedly add to your understanding. Test structures were installed with the samples various foam products that are exposed to the basic natural factors for 2.5 years. Samples were taken periodically from the roof to measure the thermal resistance under laboratory conditions.
In Later a series of samples was measured and the thermal resistance under field conditions. To develop a methodology to assess long-term thermal performance, which could be applied to all types of XPS, regardless of their operating conditions, the type of VA should consider the following aspects of evaluation: Systematic variation of the physical properties of cellular plastics, produced industrially. Because of these characteristics of the material, obtained on small samples may be wrong to characterize the product, systematic differences in the characteristics of the material, measured on samples taken from the surface or "depth" of the material. Because of heterogeneous structure of the material characteristics are defined on a sample taken in the "core" material, may not adequately represent the product in general, potential impacts of environmental factors on the aging process foam insulation. Because of this, the effect of thermal performance, as measured under isothermal conditions, may be incorrect to the actual characteristics of the material in the field. So way, environmental factors can cause an even greater difference between the rates of thermo XPS, projected computer model, and the value measured during field tests. Results studies have shown that environmental factors have not had a noticeable effect on the aging process plates XPS.