Nonlocal thermodynamic response of thermal insulation layer–substrate wall system considering the temperature-dependent thermal material properties

Abstract

Changes of the insulation performance and deformation characteristics caused by temperature in the external thermal insulation system (ETICS) have a significant influence on its energy-saving effect. In this paper taking into account the temperature-dependence thermal material properties, the thermal contact resistance at the interface, and the elastic wave impedance, a bilayered structure model for insulation layer and the wall was established to study the nonlocal thermodynamic response. Based on the fractional order generalized thermoelasticity theory and introduced nonlocal dimension parameters, the solutions for insulation layer surface under harmonic temperature load were obtained. The effects of thermal contact resistance, nonlocal factor and fractional order parameter on the temperature, stress and displacement of the ETICS were analyzed. The results can provide theoretical support for solving the problem of deformation of the interface between the insulation layer and the wall.

Keywords:

• Contact resistance
• elastic wave impedance
• fractional order
• nonlocal thermodynamic
• temperature-dependent
• thermal insulation layer–substrate wall system

Additional information

Funding

This work was financially supported by the Zhejiang Provincial Natural Science Foundation of China (No. LGF18E080010), the Primary Research and Development Plan of Zhejiang Province (No.2019C03120, 2020C01147), and Nanhu college of Jiaxing University School-class Key Topics of Funded Projects (No. N41472001-58).