2.4.5
Casing
Casing shall be aluminum. Finish shall be mill finish or factory applied
baked enamel, embossed or bronze anodized aluminum. Cover glazing shall be
separated from the casing by an EPDM rubber gasket or equivalent material.
Allowance shall be made for thermal expansion between the cover and
absorber plates and the casing, and for drainage of moisture through weep
holes.
2.4.6
Mounting and Assembly Hardware
Mounting brackets and hinges shall be aluminum or stainless steel.
Assembly hardware including all bolts, washers, and nuts shall be stainless
steel.
2.4.7
Collector Warranty
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NOTE: Most flat plate collector manufacturers
provide a 10-year warranty. In the past, the solar
energy field attracted a large number of
disreputable manufacturers, many of whom were out of
business long before their warranty expired. Any
manufacturer that meets this collector specification
should provide a quality collector that is capable
of surviving the warranty.
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Contractor shall provide a minimum 10-year warranty against the following:
failure of manifold or riser tubing, joints or fittings; degradation of
absorber plate selective surface; rusting or discoloration of collector
hardware; and embrittlement of header manifold seals. The warranty shall
include full repair or replacement of defective materials or equipment.
2.4.8
Solar Collector Performance
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NOTE: The maximum number of collectors per bank
allowed by the manufacturer should be investigated.
This number is dependent on the header and riser
diameters, flow rates, and thermal expansion
characteristics of the collector. It is expected
that most 1.2 m (4 foot) wide collectors can be
grouped into banks of at least seven, and this is
the largest bank size allowed.
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Thermal performance shall be plotted on the thermal efficiency curve in
accordance with ASHRAE 93. The y-intercept shall be equal to or greater
than 0.68, and the numerical value of the slope of the curve (FRUL) shall
be between 0 and minus 5.7 watts per square meter per degree K (0 and minus
1.0 Btu per hour per square foot per degree F) 0 and minus 1.0 Btu per hour
per square foot per degree F. Manufacturer's recommended volumetric flow
rate and the design pressure drop at the recommended flow rate shall be as
shown. Manufacturer's recommendations shall allow at least seven
collectors to be joined per bank while providing for balanced flow and for
thermal expansion considerations.
SECTION 13600A
Page 15
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