Calculation Of Pressure Loss - Danfoss InLine Manual

Calculating pressure loss
This example is only valid for panels with a nominal fan
speed (1500 rpm).
Example: Stand-alone panel
Conditions:
Pressure loss Δp is calculated using the formula
Pressure loss in this example is therefore:
Example: Panels in series
Panel variant C
50 ˚C
60 ˚C
Effect:
Flow:
K v value:
Information on effect and flow can be found in the table, page 12. K v values for each panel variant can be found on pages 8-9.
Total effect:
Total flow:
Total K v value:
Pressure loss Δp is calculated using the formula
Pressure loss in this example is therefore:
16
50 ˚C
60 ˚C
Temperature set:
Panel length:
Heat effect (see table, page 12):
Flow (see table, page 12):
K v values (see Panel variants pages 8-9):
Δp = (0.086/0.9)
3500 mm
983 W
86 l/h
1.4
K
v
Δp = (0.225/0.67)
VD.YC.D2.02
K v values for each panel variant are calculated based on a
3.5 m long panel.
Panel variant ST
Δp = (q/Kv) where q = flow in m
2
= 0.01 bar
2
Panel variant E
2500 mm
605 W
53 l/h
1.4
ΣP = P + P + P
2 3
1
Σq = q + q + q
1 2 3
1
= √
1 1 1
+ +
K K K
2 2 2
v1 v2 v3
Δp = (q/K v ) 2 where q = flow in m
= 0.1 bar
2
© Danfoss 01/2006
60/50/20 ˚C
3450 mm
983 W
86 l/h
0,9
/h.
3
Panel variant RT
3500 mm
983 W
86 l/h
0.9
983 + 605 + 983 = 2571 W
86 + 53 + 86 = 225 l/h
1
K
Σ = √
1 1
+ +
v
1.4 1.4
2 2
3 /h.
= 0.67
1
0.9
2
CONVEC