2.9
SOLAR COLLECTORS
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NOTE: In accordance with ASHRAE 93 and ASHRAE 96,
solar collector is "a device designed to absorb
incident solar radiation and to transfer the energy
to a liquid passing through it." Use the liquid
flat-plate collector for system design, including
cooling applications up to 141 kW 40 tons. Use
ASHRAE 93 for glazed collectors and ASHRAE 96 for
unglazed collectors. The State of Florida requires
all solar collectors to be certified by FSEC
(Florida Solar Energy Center). If the project site
is not in Florida and the state and local
regulations do not prohibit FSEC certified
collector, the use of FSEC collector may be
considered as an option. Provide lightening
protection as required by the local environment. A
collector in which the internal risers and headers
are in a reverse return arrangement will have
uniform flow and uniform heating, but it will be too
restrictive to limit only this arrangement. When
inlet and outlet tubes are not located conveniently
on the collector, the collector will take up
additional spaces, resulting more exposed roof area
between the collector and greater likelihood of
leaking at joints.
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[ASHRAE 93] [ASHRAE 96] [SRCC OG-100 and SRCC CSCWHSRlisted] [or] [Florida
Solar Energy Center (FSEC) certified]; liquid flat-plate collectors.
Provide factory fabricated and assembled, [single glazed] [double glazed]
[triple glazed] [or] [unglazed] panels. [Internal manifold collectors may
be used if manufacturer standard.] Include the following design features:
2.9.1
Collector Sizes
Maximum filled weight not to exceed 24.40 kg per square meter five pounds
per square foot of gross collector area.
2.9.2
Minimum Performance Parameters
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NOTE: In accordance with ASHRAE 93 and ASHRAE 96,
instantaneous collector efficiency is "the amount of
energy removed by the transfer liquid per unit of
gross collector area during the specified time
period divided by the total solar radiation incident
on the collector per unit area (solar flux) during
the same time period, under steady-state or
quasi-steady-state (the state of the solar collector
test when the flow rate and temperature of the
liquid entering the collector are constant but the
exit liquid temperature changes gradually due to the
normal change in irradiation that occurs with time
for clear sky conditions) conditions." For further
details and unit measurements, read ASHRAE 93 and
ASHRAE 96.
SECTION 13610N
Page 16
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