BASEMENT LEVEL DESIGN: Assume no carpet 1 zone radiant floor
From radiant floor manufacturer’s data: Install radiant loops 12” on center
The manufacturer chosen for this example recommends a maximum loop run of 300’ for ½” PEX. The maximum loop length varies from manufacturer to manufacturer and by pipe size. See “ Radiant Floor Heating ” section of this manual. Average loop temperature required is 85°F HWS = 90°F (for a bare, concrete floor) ΔT = 10°F
Calculate the # of loops of ½” PEX:
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Basement Flow Calculations:
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SIZE THE MAIN FLOOR HOUSE PUMP Each HWBB section includes a 3/4 ” copper fin tube element. At 1 gpm, head loss for 3/4 ” copper is about 0.5’ per 100’ (see, “ Flow and Heat Capacity Tables ”) . The head loss for 1/2 ” PEX at 1 gpm is approximately 3 ’ per 100’ .
HWBB Loss
(
)
1/2 ” PEX
(
)
Radiant Manifold
2’
1” Copper Feed to Manifold
(
)
1” Mixing Valve
4’
Subtotal
8.31’ 10%
Misc Fittings
Total Head Loss 9.14’ Size the house pump for 6 gpm @ 9.14’
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Hydronic System Design Manual ©DECTRA CORPORATION - March 2013
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