Environmental Engineering Reference
In-Depth Information
Fig. 5.18 Four HSL units being installed on newly constructed ORNL building
Fig. 5.19 HSL installation at Walmart in McKinney, TX
thelightsispresentatthattime,because there is not yet enough sunlight
available to provide any useful lighting from the HSL system. As the sun
climbs higher during the day, the quantity of natural light available increases,
and in response, the electric lights dim to maintain a uniform level of illumina-
tion throughout the day. In the afternoon, as the solar energy weakens,
the electrical lighting again increases to maintain the illumination level.
Finally, as the office inhabitants depart in the afternoon, the electrical load
is turned off.
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