Abstract
Enclosed airspaces of different dimensions and inclinations that exist in buildings include double-pane windows, curtain walls, skylight devices, and reflective insulation assemblies for walls and roofing systems. Evaluating the energy performance of buildings requires accurate determination of the thermal resistance of enclosed airspaces in different climates. The parameters that affect enclosed airspace thermal resistances include the physical properties of air, the temperatures and emittances of airspace surfaces, airspace dimensions, and heat-flow direction. The Airspace Reflective Tool (ART) was developed for determining the thermal resistances of enclosed airspaces for a wide variety of conditions. In this article, for enclosed airspaces of various orientations and heat flow directions, the ART has been used to conduct a parametric study to quantify the effect on thermal resistance of: effective emittance, operating conditions such as temperature, orientation, dimensions (aspect ratio) and heat flow-direction. The calculated thermal resistances from the ART were compared with those in the ASHRAE Handbook of Fundamentals or calculated using ISO-6946 that are currently being used to obtain thermal resistances of enclosed airspaces and show the importance of the factors being considered.
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