be located such that there is no possibility of air
pockets. Items to be shown on the drawings must
include:
a. Flow rate through collector loop based on
recommended flow per collector
b. Reverse-return piping shown and noted
c. Valves, strainers, automatic controls, and all
accessories
d. Pipe pitch for draining.
**************************************************************************
The array piping shall include interconnecting piping between solar
collectors, and shall be connected in a reverse-return configuration as
indicated with approximately equal pipe length for any possible flow path.
Flow rate through the collector array shall be as indicated. Automatic
pressure relief valves shall be provided in the array piping system as
indicated, and shall be adjusted to open when the pressure within the solar
array rises above 862 kPa 125 psig. Each collector bank shall be capable
of being isolated by valves, and each bank capable of being separated shall
have a pressure relief valve installed and shall be capable of being
drained. Manually operated air vents shall be located at system high
points, and all array piping shall be pitched a minimum of 21 mm/meter 0.25
inch/foot as shown so that piping can be drained by gravity. Calibrated
balancing valves shall be supplied at the outlet of each collector bank as
indicated.
2.5.3
Supports for Solar Collector Array
**************************************************************************
NOTE: The support structure for the solar array is
to be constructed from aluminum to eliminate cost
and maintenance of a painting system. For the
majority of solar projects, this structure will be
constructed as a support rack on a flat roof.
Design loads for solar arrays include the filled
weight of the collectors, weight of filled piping,
wind, seismic and snow loads, and the weight of the
support structure itself. Of these, the wind
imposed on solar collector arrays may require the
most attention. Provide sismic details, if a
Government designer (either Corps office or A/E) is
the Engineer of Record, and show on the drawings.
Delete the bracketed phrase if seismic details are
not provided. Sections 13080 and 15070A, properly
edited, must be included in the contract documents.
Support structures provided by the collector
manufacturer may be used if they meet the stated
specification.
**************************************************************************
Support structure for collector array shall be aluminum and shall be in
accordance with Section 05500A MISCELLANEOUS METAL. Support structure
shall secure collector array at the tilt angle with respect to horizontal
and orientation with respect to true south as shown. Support structure
shall withstand static weight of filled collectors and piping, wind, snow,
seismic, and other loads as indicated. Seismic details shall conform to
Sections 13080 SEISMIC PROTECTION FOR MISCELLANEOUS EQUIPMENT and 15070A
SEISMIC PROTECTION FOR MECHANICAL EQUIPMENT [as shown on the drawings].
SECTION 13600A
Page 17
Previous Page
