Replacement Parts

TECHNICAL DATA
191
|
HYDRONIC SOLUTIONS CATALOG
hydraulic resistance
equivalent resistance
r = (αcL)
therefore:
HL= r (f)
1.75
= (αcL) (f)
1.75
where:
HL = Head loss across a device due to viscous friction (ft of
head)
α = fluid properties factor based on the fluid’s density and
viscosity
c = constant based on the size of the tube
L = length of pipe, or equivalent length of a piping device (ft)
f = flow rate of fluid through the component (gpm)
Hydraulic Resistance of Series - connected Components
r
series
=
Σ
r
i
= (r
1
+r
2
+r
3
+r
4
+....+r
n
)
Hydraulic Resistance of Parallel - connected Components
r
parallel
=
[ ]
the fluid properties factor (α)
where:
α = fluid properties factor
D = density of the fluid (1 lb/ft
3
)
μ = dynamic viscosity of the fluid ( 1lb/ft/sec )
50
0.04
0.045
0.05
0.055
0.06
0.065
70 90 110 130 150 170 190 210
230
250
alpha value of water
water temperature (°f)
Graph of
α
- value of water for temperature of 50°f to 250°f
50 70 90 110 130 150 170 190 210
230 250
58
58.5
59.5
50.5
51.5
62.5
59
60
61
62
63
density of water (lb/cubic ft.)
water temperature (°f)
The density of water as a function of temperature
50 70 90 110 130 150 170 190 210
230
250
0.0009
0.0008
0.0007
0.0006
0.0005
0.0004
0.0003
0.0002
0.0001
0
dynamic viscosity (lb/cubic ft.)
water temperature (°f)
Dynamic viscosity of water as a function of temperature
0.5714
n
0.5714
3
0.5714
2
0.5714
r
1
r
1
r
1
r
1
1
++++ ...
( )
-0.25
μ
D
= α