Abstract
The main purpose of this work is to perform a thermal analysis in an air conditioning duct to verify the influence of the thermal properties of the insulating material on the minimum thermal insulation thickness necessary to avoid the condensation of water vapor present in the air. The mathematical formulation is based on Fourier’s law and the first law of thermodynamics. A response surface, a contour plot and a mathematical model for the analyzed response variable, were obtained from an experimental design. Results indicate that the reduction of thermal conductivity and increase of emissivity of the insulating material contribute to the reduction of the minimum thermal insulation thickness.
Highlights
Indoor air quality is a global concern of the modern world
The main purpose of this work is to perform a thermal analysis in an air conditioning duct to verify the influence of the thermal properties of the insulating material on the minimum thermal insulation thickness necessary to avoid the condensation of water vapor present in the air
The purpose of this work is to perform a thermal analysis in a rectangular duct for air conditioning transport, to quantify the influence of the thermal conductivity and the emissivity of the insulating material on the minimum thermal insulation thickness necessary to avoid the effect of condensation
Summary
Indoor air quality is a global concern of the modern world. To provide air quality, it is important to have control of various parameters such as temperature, relative humidity, atmospheric pollutant concentrations and air changes per hour. In central air-conditioning systems, air is cooled in the evaporator and conducted to the environments to be air conditioned through a structural assembly known as the ductwork. Such systems are commonly employed in the air conditioning of commercial buildings, malls, convention centers, large hotels, pharmaceutical industries, hospitals, etc. Metal ducts used for air conditioning transport must be thermally insulated for two main reasons: reduce heat transfer from the outside environment to the interior of the duct and avoid condensation of water vapor in the air when in contact with the cold surface of the duct
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