Sustainable Window Design - Development Story

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This documents our experience in designing, building and operating the sustainable window design at the Green Garage.

Goals

    • Provide 80% of the interior lighting with natural daylight.
    • Provide adequate natural ventilation to minimize the need for mechanical ventilation whenever possible.
    • Provide a sense of security and well-being within the living building, while providing an attractive and inviting addition to the community.
    • U Factor (Thermal) < 0.30
    • Window -to-Wall Ratio (WWR) < 27%
    • Solar Heat Gain Coefficient (SHGC): E = .30; W = .30; N = .30 ; S = .55; Skylight = .55
    • Visual Light Transmittance (VLT or VT); E = .50; W = .50; N = .50; S(up) = .70; S (view)= .50; Skylight = .70


Design

  • Challenges:
    • Anchoring windows with 4" of foam insulation on outside.
    • Maintaining R values of walls at window openings.
    • Security
      • After input from the security group, the window choices are:
        • Use small windows, which are more difficult to come through.
        • use security bars
        • use security screens, (stainless steel, woven fabric).
        • use security glass, typically some type of laminated glass.
    • The replacement windows in the historical facade must closely resemble the original showroom window.


The Walls

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Build

Operate