A better understanding of how thermal comfort in the winter is affected by different glazing performance criteria and geometries allows architects to make informed decisions when selecting a glazing scenario. This ensures a comfortable environment for occupants without the need of supplemental perimeter heating strategies.
Two factors must be considered when designing a glazed opening in cold climates: radiant discomfort and downdraft discomfort. The effect of each correlates to the glazing U-factor and window geometry. This becomes particularly critical when comparing the effects that room-side low-e coatings can have on thermal comfort and risk of condensation.
This work has culminated in the Glazing and Winter Comfort Tool, a simple, publicly available, online tool that allows designers and engineers to study how different glazing scenarios impact occupant comfort, thus helping eliminate the potential need for supplemental perimeter heat.