UFC 3-440-01
14 June 2002
(c) Is the RI between 5.0 and 7.0?
(d) If "no" to (c) above, will necessary water treatment be provided?
b. Coordination
(1)
Architectural.
(a) Unobstructed roof area and access to roof must be available for
the solar system.
(b) Building should be located with adequate solar access and free
from shading by other buildings or landscaping.
(c) Mechanical equipment room, pipe chases, roof access will be
required.
(2)
Structural.
(a) Roof design will need to support solar system loads.
(b) Aluminum array support structure will be required.
c. System Planning - Array Layout and Estimated Roof Area Requirement
(1) Minimum number of collectors. Assuming a nominal 4 by 10 ft (1219
by 3048 mm) collector (40 ft2 (3.7 m2)), determine the minimum number of collectors
required by dividing the calculated array size by 40 (3.7) and round to nearest whole
number.
(2) Maximum number of collectors. Assuming a nominal 4 by 8 ft (1219 by
2438 mm) collector (32 ft2 (3.0 m2)), determine the maximum number of collectors
required by dividing the calculated array size by 32 (3) and round to nearest whole
number.
(3) Bank size (B). Based on the range of values from above, determine
the size of the collector banks. All banks must have the same number of collectors
(between 4 and 7), and must be capable of being arranged symmetrically on the roof to
allow for reverse-return piping. The area of the collector unit (Ac, minimum of 28 ft2 (2.6
2
m )) and the collector dimensions (height and width) should now be determined.
(4) Minimum row spacing (optional). The collector unit height and site
latitude can be used to establish the minimum spacing necessary between multiple
collector rows to prevent shading. Figure 3-5 can be used for this purpose. If the
collector banks are to be laid out in a single row, this step may be avoided.
(5) Array layouts and estimated roof area options. Having been informed
of the need for a solar system, the architect should have information available regarding
D-2
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