The selection of a glazing type for a project is based on factors like thermal performance, impact on occupant thermal comfort and cost. Double pane glazing units with a room-side low-e coating are becoming popular, because their thermal properties and visual appearance are comparable to those of a triple pane unit, but at a lower cost. However, the impact of selecting one over the other can have significant impact on seasonal thermal comfort conditions, and the wrong choice could lead to a need for perimeter heating as a remedial measure. This session addresses the benefits and drawbacks of using double pane glass with a room-side low emissivity coating as a substitute to a more expensive and heavier triple pane unit. In order to ensure no perimeter heating is necessary with either unit, we introduce a method to quantify two factors affecting occupant thermal comfort: radiant temperatures and risk of downdraft.
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