Aplicação da transformada de laplace para o problema do transiente térmico em multicamadas

Abstract

Cold rooms are air-conditioned environments used in food preservation. Basically they have walls formed by different materials. In general, a cold chamber is composed of a brick layer (external wall), a layer of thermal insulation and a third (inner) layer which serves as a coating in which various types of materials can be used. Therefore, its composition is in multilayers. The objective of this work is to perform a computational modeling of the thermal transient between the layers of the cold chamber. In this work the Laplace Transform method was used to treat the problem of heat transfer in a composite bar, modeling the problem by the known heat conduction equation. Studies have shown that analytical and numerical treatments are possible for the thermal transient problem in a composite bar, but some methods have limitations. The analysis of the behavior of the temperature distribution in the composite bar (by different materials) by the Laplace Transform method proved to be efficient (due to the solution of the problem of the discontinuity in the temperature function) and flexible (different properties of the materials can be used) in the solution of the proposed problem (two-layer thermal transient using thermal properties of a cold chamber).