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 TABLE B-1 : Suggested Flow Rates for Solar Applications
System
Fluid Type
Component
Water
50/50
Oils
Glycol
Gpm/sq ft
Gpm/sq ft
Gpm/sq ft
of Collector
of Collector
of Collector
Glazed
0.025
0.025
0.050
Flat-Plate
to
to
to
Collectors
0.030
0.030
0.060
Evacuated
0.012
0.012
N.A.
Tube
to
to
0.014
0.014
Collectors
Unglazed
0.050
N.A.
N.A.
Pool
to
Collectors
0.250
Closed Loop
1.25 to 2.0
times that of
N.A.
N.A.
System Storage
collector loop
Water Loop
Draindown
1.25 to 2.0
N.A.
N.A.
times that of
System Storage
Water Loop
collector loop
Pipe S i z e s
Solar system piping should be sized to supply an adequate flow without
unnecessarily large pumps. This normally means larger sizes. However, in closed
loops, the piping should be sized to provide a velocity of at least 1.5 ft/sec. to aid in
air elimination, but not more than 4.0 ft/sec to avoid erosion corrosion of copper
tubing and fitting walls.
The following table lists appropriate flow rate ranges for various sizes of copper
tubing.
APPENDIX B
B-2
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