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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

An Interferometric Study of the Effect of Insect Screens on Free Convection at a Window Glazing

Get access (open in a dialog) DOI: 10.1615/IHTC15.ncv.008239
pages 5289-5301

要約

A Mach-Zehnder interferometer is used to measure the effect of insect screens on the free convective heat transfer rates from an idealized isothermal window. An understanding of the effect of insect screens on convection is important for the thermal performance analysis of fenestration. Measurements are made for two commercially available screens, one with relatively low permeability and one with relatively high permeability. Comparisons are made to the case with no screen. Local Nusselt number data and infinite fringe interferograms are presented. Effect of the spacing between the window and screen is also investigated. The measurements show that a screen can significantly reduce the convective heat transfer rate from the window. The main utility of the current work is expected to be for the validation of CFD modeling. Favorable comparisons with results from a CFD model in the literature suggest that an insect screen can be adequately modeled as a thin layer of uniform porous medium.