Abstract
The energy conversion and noise characterization in an exterior rectangular duct is important, for example, in modeling PV solar wall and transpired unglazed structures. The energy conversion in an exterior rectangular duct is a function of solar irradiation, air gap width, mass flow rate and pressure, wall and air temperatures. A generalized two dimensional thermal analysis of an outdoor duct is presented by placement of surface and air nodes into two adjacent stacks of control volumes representing outer and inner walls of duct. A matrix solution procedure is adopted by constituting conjugate heat exchange of conduction, convection, radiation and ventilation heat transport. Noise characterization due to energy conversion in outdoor ducts is also presented. The energy conversion and noise characterization is supported with some experimental results of a photovoltaic (PV) solar wall installed in an outdoor test-room. Furthermore, some examples of noise characterization calculations are illustrated using devised noise measurement equations.
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