A design method is put forward for an outdoor duct to improve the traditional design methods by considering conduction and radiation along the length of walls for an outdoor duct. A generalized two dimensional thermal analysis of an outdoor duct is derived by placement of surface and air nodes into two adjacent stacks of control volumes. A matrix solution procedure is adopted by constituting conjugate heat exchange of conduction, convection, radiation and ventilation heat transport. A comparative heating/cooling load study for a traditional and improved method is performed through an example of standard size of an outdoor duct [2.5 mm aluminum rectangular duct with a size of (0.1 m (H) X 1.0 m (W) X 3.0 m (L))]. The given outdoor duct is exposed to a steady solar heat flux and is installed on a well insulated building façade. The sensitivity analysis for an outdoor duct is conducted for critical design of ventilation requirements and materials with supply of varying outdoor mass flow rate to a single building zone. The improved method is useful for accurately predicting ventilation air requirements through an outdoor duct. The validation of the design tool is done with operation of an outdoor photovoltaic duct wall.
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How to cite this article
Dehra, H. (2010). 'A Design Tool for an Outdoor Duct'. SET Proceedings, 9, pp. 1-8. https://doi.org/10.65582/set.2010.170
