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Appendices - GSA

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Table A-1: Characteristics of Daylighting Technology Used for Analysis<br />

Office<br />

Warehouse<br />

Utility<br />

Skylight Transmittance 0.7<br />

Lightwell Transmittance 0.8<br />

Coefficient of Utilization Daylight 0.55<br />

Coefficient of Utilization Elec Light 0.55<br />

Luminous Efficacy Elec Light<br />

Roof U-value<br />

Skylight U-value<br />

Cooling COP 3.5<br />

Heating Efficiency 0.8<br />

Skylight Cost<br />

Controls cost<br />

Lighting Levels<br />

30 Fc<br />

15 Fc<br />

30 Fc<br />

75 Lumens/watt<br />

0.1 btu/hr/F<br />

0.5 btu/hr/F<br />

25 $/sf<br />

$/sf floor<br />

0.25<br />

area<br />

33

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