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16
The boiler heat exchanger does have a pressure drop which must be considered in system design. Refer to the graph in Table 5 for pressure
drop through the boiler heat exchanger.
Table 5 - Heat Exchanger Pressure Drop
The chart below represents various system design temperature rise through the boiler along with respective flows and friction loss. This is
provided to aid in circulator selection.
Model
Friction Ft
1000
19'
1700
35'
Table 7 - Temperature Rise, Friction Feet, and Flow Rate
The chart below represents the combined flow rates and pipe sizes when using multiple boilers to design the manifold system for the primary
circuit. To size, simply add the number of boilers and the required flow rates for the system design temperature.
Table 6 - Multiple Boiler Manifold Piping
whl-428-r1 Rev. 001 Rel. 012 Date 7.21.20
System Temperature Rise Chart
20°Δt
Flow Rate (GPM)
Friction Ft
100
170
25°Δt
Flow Rate (GPM)
11'
80
26'
130
30°Δt
Friction Ft
Flow Rate (GPM)
8'
66
18'
109
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