In this work, we present a study of heat transfer through the different layers of a frequency modulated pavement structure. Solving the heat equation for the different layers obtained the temperature and the heat flux density of each layer (from the wearing course to the base layer) of the structure. The expression of the equivalent thermal impedance of the wearing course in crushed plastic bag waste and sugar cane residue, found by thermal electrical analogy, allowed to study the diagrams of Bode, its phase and his portrayal of Nyquist. These studies are carried out in the illumination zone and in the shaded zone.
Based on a dynamic frequency study, the thermal behavior of a wall consisting of a concrete slab contiguous to a panel of compressed rice straw is presented. The thermal behavior at the interface of the two materials is modeled by a thermal contact resistance. The insulating nature wall thus made is studied according the order magnitude of contact resistance: the perfect contact (Rc=0) extreme contact defects (Rc very high). The analysis of temperature and heat flow density curves show that the insulation effects are all the greater as the defects are important.
The thermal transfer in the tow plaster (insulating material) is modeled by numerical method resolution in transient regime. The discretization of the reduced space variable and the reduced temporal variable is applied to the heat equations, the boundary conditions and the initial condition. The expressions of the dimensionless temperature allowed to represent the curves of evolution of the reduced temperature in the reduced time. The time constant characterizing the reduction of the reduced temperature in the material makes it possible to calculate its thermal diffusivity.
The study of heat transfer under dynamic transient conditions established the tow-plaster material thermal resistance. We present a one-dimensional heat transfer study using a Tow-plaster material. We show the thermal resistance evolution of in the material subjected to climatic solicitation in transient dynamic regime. This is a one-dimensional, fully analytical modeling. This model allows us, on the one hand, to express the thermal resistance in the form of a sum of three resistances and thus to show the tow-plaster material relative thermal resistance. This study is highlighting in relation to the thermal behavior of the material by showing the influence of the coefficients of exchange.
Show abstract
Full Text
