Requirements for capacity calculations
EXHAUSTO air handling units are measured with 1m straight ducts (except VEX170, VEX270 and VEX280 which have 2m duct) on all 4 connection spigots.
The uniform low velocity profile of the air in the spigot does not cause any significant system pressure loss.
This means that there can be fitted elbows or bends immediately after the unit.
pt is the total available pressure for both the extract and supply air sides including pressure loss for the F5 filter. Pressure for VEX100 includes water heating coil.
Pressure loss of heating coils for the VEX200 and VEX300 is NOT calculated as the heating coil is located externally.
In all cases, the pressure loss for F5 filters is included.
The stated operation curves show the fan characteristic with downwards regulation.
They stated SFP curves show the specific electrical consumption in J/m³ air, that is the units total power consumption for both fans including any internal pressure drop.
The uniform low velocity profile of the air in the spigot does not cause any significant system pressure loss.
This means that there can be fitted elbows or bends immediately after the unit.
pt is the total available pressure for both the extract and supply air sides including pressure loss for the F5 filter. Pressure for VEX100 includes water heating coil.
Pressure loss of heating coils for the VEX200 and VEX300 is NOT calculated as the heating coil is located externally.
In all cases, the pressure loss for F5 filters is included.
The stated operation curves show the fan characteristic with downwards regulation.
They stated SFP curves show the specific electrical consumption in J/m³ air, that is the units total power consumption for both fans including any internal pressure drop.
pt = total pressure
pt = pt2,2-pt2,1
Teperature = 20°C;
Density = 1,2 kg/m³
SFP = Specific Fan Power (J/m³)
qv = Volume flow (l/s)
P1 = Power (W)
P1 = SFP x qv x 10-3
pt = pt2,2-pt2,1
Teperature = 20°C;
Density = 1,2 kg/m³
SFP = Specific Fan Power (J/m³)
qv = Volume flow (l/s)
P1 = Power (W)
P1 = SFP x qv x 10-3
VEX100 measuring positions
Calculation Example
Desired external performance: qV = 1800l/s (6500 m3/h)pt = 250Pa
Selected solution: VEX170-1 med F7 filtre
External pressure performance, pt = 250 Pa
Pressure supplement F7-filters, pt = 28 Pa
Total pressure performance, pt = 278 Pa
Read specific electricity consumption, SFP = 2430 J/m³
Power consumption
P1 = 2430 x 1800 x 10-3= 4375 Watts
VEX200 measuring positions
Calculation Example
Desired external performance: qV = 900 l/s (3240 m3/h)pt = 250Pa
Selected solution: VEX250 med F7 filtre
External pressure performance, pt = 250 Pa
Pressure supplement F7-filters, pt = 45 Pa
Total pressure performance, pt = 295 Pa
Read specific electricity consumption, SFP = 2300 J/m³
Power consumption
P1 = 2300 x 900 x 10-3= 2070 Watts
VEX300 measuring positions
Calculation Example
Desired external performance: qV = 500 l/s (1800 m3/h)pt = 250Pa
Selected solution: VEX340H med F7 filtre
External pressure performance, pt = 250 Pa
Pressure supplement F7-filters, pt = 17 Pa
Total pressure performance, pt = 267 Pa
Read specific electricity consumption, SFP = 1950 J/m³
Power consumption
P1 = 1950 x 500 x 10-3= 975 Watts
last updated 14-02-2011
