Glass Building or Glass Furnace?
“In God we trust. All others must bring data.” – by W. Edwards Deming.
The building envelope comprises walls, roof, and fenestration (openings including windows, doors, vents, etc.). The design of the building envelope influences heat gain/loss, natural ventilation, and daylighting, which, in turn, determines indoor temperatures, thermal comfort, and sensible cooling/heating demand.
Glass buildings have high envelope heat gain, whereas well-shaded, insulated, reduced window wall ratio buildings have lower heat gains. Envelope heat gains are measured in W/m2 & W/ft2. Envelope heat gains are also called OTTV (Overall Thermal Transmittance Value).
From the graph, reducing window to wall ratio dramatically reduces the overall building energy consumption.
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