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To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.solener.2005.04.016 Byline: R.G. Southall (b), M.E. McEvoy (a) Keywords: Windows; Ventilation; Solar Abstract: 'Supply air windows' under optimum flow conditions function as an efficient heat reclaim device. Heat escaping from the room, through the inner glass pane, is entrained in the air flow between the inner and outer sashes and returned to the room. A low-E coating to the inner glass acts as a barrier to radiation heat loss across the window so very low U-values can be achieved. These same characteristics enable the window to function as a passive solar component. Its efficiency is inferior to that of a dedicated passive solar device due to its transparency, but even so at modest levels of incident solar gain a worthwhile proportion is entrained into the air flow and supplied to the rooms as pre-heated ventilation air supply. These characteristics have been established by laboratory, test cell investigations, and simulations using computational fluid dynamics and ESP-r, a whole building dynamic thermal modelling tool. Author Affiliation: (a) Department of Architecture, University of Cambridge, The Martin Centre, 6 Chaucer Road, Cambridge CB2 2EB, United Kingdom (b) The Martin Centre for Architectural and Urban Studies, 6 Chaucer Rd, Cambridge CB1 2EB, United Kingdom Article History: Received 1 September 2004; Revised 14 April 2005; Accepted 14 April 2005 Article Note: (miscellaneous) Communicated by: Associate Editor Gabriela Alvarez-Garcia

'Supply Air' windows work as a heat reclaim device by intercepting a substantial proportion of incident solar energy as well as entraining heat escaping from rooms. This series of experiments [...]