Experimental validation of a numerical model for heat transfer in vacuum glazing

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.solener.2005.04.002 Byline: Yueping Fang (a), Philip C. Eames (a), Brian Norton (b), Trevor J. Hyde (a) Keywords: Vacuum glazing; Guarded hot box calorimeter; Overall heat transfer coefficient Abstract: Flat vacuum glazings consisting of a narrow evacuated space between two glass panes separated by an array of small support pillars have been fabricated. A guarded hot box calorimeter was designed and constructed to measure their heat transfer coefficients. Experimental measurements of temperatures and rates of heat transfer were found to be in very good agreement with those predicted using a developed finite element model. A method for determining the heat transfer coefficient of the evacuated gap has been established and comparisons are made between the measured and predicted glass surface temperature profiles of the exposed glass area and the heat transfer coefficients of the total glazing system in order to validated the model. Author Affiliation: (a) Centre for Sustainable Technologies, School of the Built Environment, University of Ulster, Newtownabbey, BT37 0QB, N. Ireland, UK (b) Dublin Institute of Technology, Aungier Street, Dublin 2, Ireland Article History: Received 2 January 2004; Revised 24 November 2004; Accepted 4 April 2005 Article Note: (miscellaneous) Communicated by: Associate Editor Gabriela Alvarez-Garcia