Calculation Coil Pressure Drop
Calculation Coil Pressure Drop
(OP)
Trying to balance some hydronic coils. I have the design gpm, actual gpm and design water pressure drop. Is there a formula to calculate the actual pressure drop?
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Calculation Coil Pressure Drop
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RE: Calculation Coil Pressure Drop
dp(q1)/dp(q2)=(Q1/Q2)^2
that is: pressure drop is proportinal to the flow rate (actually its velocity) squared
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Morten
RE: Calculation Coil Pressure Drop
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RE: Calculation Coil Pressure Drop
f(coil) = f (straight pipe) *[1+3.5×(d/D)]
f = Moody friction factor
d =inside diameter of the coil tubing
D= Diameter of the helical coil
Reference: Matthew J.Realff & Jde T sommerfield
Georgia insitute of technology)
In addition, if flow is laminar, dp(q1)/dp(q2)=(Q1/Q2)
"We don't believe things because they are true, things are true because we believe them."
RE: Calculation Coil Pressure Drop
Data for friction factors in coils depend on their geometry, e.g. helices, flat or cylindrical spirals, turbulent and laminar conditions, newtonian and non-newtonian fluids.
I found another formula for helices:
The friction factor, ƒ, can be used to estimate friction drop, Δpf, using:
Where:
d and D as above; ρ = density; v = velocity.