Friday May 13th, 2016
9:00 am to 10:30 am
This is the full video recording of Glazing + Comfort.
Join BEEx for apresentation of new research on the widely misunderstood impact of glazing
selection on thermal comfort. Alejandra Menchaca, from the highly regarded
Boston firm Payette, will travel to NYC to present their research
findings on how the impact of glazing selection can positively impact thermal
comfort while reducing perimeter heating system requirements in the winter time.
In our current
paradigm, air temperature stands in as the primary metric of thermal comfort,
with set points driving selection and sizing of mechanical systems. Any potential
thermal comfort issues due to shortcomings in envelope performance are
typically compensated with perimeter heating, further increasing the energy
consumption of the building. This model is due for reconsideration. A better
understanding of how thermal comfort is affected by different glazing
performance criteria and geometries would allow architects and engineers to
make better informed decisions when selecting a glazing scenario before it’s
This talk will address two factors
when designing glazed openings in cold climates: radiant discomfort and
downdraft discomfort, and how each correlates to the glazing U-value, window
geometry and the need for perimeter heating. It will cover the physics of
glazing heat loss and its impact on comfort, as well as the decision-making
process that needs to be followed to ensure a comfortable environment early in
the design. In particular, Alejandra will address the impact that room-side
low-e coatings, which significantly reduce the U-value of a glazing unit, can
have on potential risk of downdraft.
Following the presentations Yetsuh Frank from BEEx will pose a few questions, with time left for discussion with the audience as well.
Alejandra Menchaca, PhD, LEED AP
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