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Azmuth Trackers For Flat Roofs: Three Case Studies
Solar trackers are needed that are sized to fit on a flat roof with no roof penetration and with low profiles for low
wind resistance. The JX Crystals (JXC) fixed-tilt/azimuth carousel
is a low-profile tracker designed to distribute weight evenly
over a large area and for low wind resistance on the roof. It is
designed as a compact pre-fabricated unit, where the module
support arms fold down for easy shipping. When these arms are
folded down, the carousel is only 8 inches ( 20 cm) tall. Without
mounted modules, it is slightly less than 8 feet wide and slightly
less than 10 feet long ( 2. 5 by 3 m), so multiple carousels can be
stacked and easily shipped on a flat-bed truck.
JX Crystals has now installed multiple Sun Track Carousels
on flat rooftops in several locations around the United States. This paper describes three of these
systems and presents an analysis of their performances.
Fraas (lfraas@jxcrystals.
com), Avery, Minkin
and Huang work for JX
Crystals Inc., in Issaquah,
Wash. Henry Schneider
( consultec@cox.net) is
principal of Consultec in
Santee, Calif., and Dennis
Larson (larsond@email.
arizona.edu) is principal
at Consulting Engineering in Tucson, Ariz. SOLAR2001_ad_ST ND10:Layout 1 9/7/10 12: 20 PM Page 1
Jxc
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