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Provide total collector flow rate in accordance with manufacturer's
recommendations. Provide instantaneous collector efficiency as follows:
Minimum Instantaneous
Inlet
Collector Efficiency,
Fluid
Percent
Parameter
74
Zero
54
0.03
40
0.05
Determine inlet fluid parameter (IFP) in accordance with the following
formula:
IFP = A - B
C
Where:
A=
Liquid inlet temperature in collector
B=
Ambient air temperature
C=
Solar flux
2.9.3
Absorber
Fabricate of [aluminum] [stainless-steel] [copper tubes on copper sheet]
[or] [copper tubes with copper fins]. Provide the absorber rated for [1034
kPa (gage)] [150 psig] [_____] with working pressure of [862kPa (gage)]
[125 psig] [_____].
2.9.4
Absorber Plate Coating
Electroplated black chrome with minimum [0.0025 mm] [1/10 mil] [_____]
thick, flat black undercoating of nickel or baked-silicone-polyester, or
equivalent surface coating. Provide coating with minimum absorptivity
0.90, maximum emissivity 0.12, and minimum breakdown temperature at [204
degrees C] [400 degrees F] [_____].
2.9.5
Collector Case
Fabricate from at least 20 gage [galvanized steel] [or] [ASTM B 209MASTM B
209 alloy or equivalent aluminum]. Paint collector box with durable baked
enamel. In the back of case, provide insulation with a heat transfer
factor of maximum 0.57 watts per degree C per square meter 0.1 Btu per
hour per degree F per square foot. Use only insulation without out-gassing
or other breakdown at or under stagnation temperature, such as rigid
mineral fiber panels. Fabricate cover frame and glazing channel of
[galvanized sheet steel] [stainless steel] [or] [extruded aluminum].
Provide preformed gaskets as specified.
2.9.6
Collector Cover (Glazing Material)
ASTM C 1048, Kind FT, fully tempered glass; Condition A, uncoated surfaces;
Type I, transparent glass; Class 1, clear; Quality q3, glazing select; [3]
[5] [or] [4] mm [1/8] [3/16] [or] [5/32] inch float glass.
SECTION 13610N
Page 17
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