NUMERICAL MODELING OF CONJUGATE HEAT TRANSFER IN AN INSULATED GLASS UNIT (IGU) WITH ACCOUNT FOR ITS DEFORMATION

The results of numerical modeling of conjugate heat transfer in an IGU with account for its deformation caused by excessive negative pressure in the glazing cavity are presented in the article. The influence of the IGU glass pane deformation on thermal characteristics and gas flow regime within the cavity are studied. A method of assessment of reduced thermal resistance of IGU is provided. The effects of different climatic impacts lead to the deformation of glasses within an IGU (and its vertical cavity, respectively). Deformation of glasses and vertical cavities reduces the thermal resistance of an IGU. A numerical simulation of conjugate heat transfer within an IGU was implemented as part of the research into this phenomenon. Calculations were performed in ANSYS FLUENT CFD package. Basic equations describing the conservation of mass, conservation of momentum (in the Boussinesq approximation), conservation of energy were solved. Also, the radiation of the cavity wall was taken into account. Vertical walls were considered as non-isothermal, while horizontal walls were adiabatic. Calculations were made for several patterns of glass deformations. Calculation results demonstrate that the heat flow over vertical walls intensifies as the distance between centres of IGU glasses is reduced. The temperature in the central area of the hot glass drops