Desenvolvimento de aparato térmico alternativo de baixo custo para medição da condutividade térmica de materiais de construção isolantes

Abstract

Civil construction is one of the most polluting sectors of human activities in almost the entire planet. It is also a sector responsible for high energy consumption. The fastest growing use of energy in the world is aimed at the comfort of environments. The building envelope is designed mainly to restrict heat transfer between the external and internal environments, and one of its purposes is to regulate the internal thermal characteristics of buildings. The application of insulating materials without envelopes helps to improve the thermal performance of buildings, eliminating the reduction in energy use with air conditioning equipment. Thermal conductivity is one of the main thermal properties to analyze this performance. Given this scenario, this work aims to develop a low-cost alternative thermal apparatus (ATA) to disseminate the thermal characterization of construction materials. The ATA followed the principles of stationary methods, which must achieve a steady state of heat transfer for a property of thermal property. The equipment was made from the hot plate / sample / cold plate system and spent less than a thousand reais to assemble it. The study shows that good results were achieved for λ ≤ 0.800 W / (m.K). The proposed device offers advantages, mainly in terms of reduced test time, low cost, ease of assembly and reading of results, over systems based on stationary methods.