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Drive Package
The following are the design requirements for ART100A unit:
Model:
Supply Air Quantity
External Static Pressure
Step 1:
From the blower curve (at 3800 CFM),
Standard operating system;
Internal Static Pressure
Step 2:
Therefore at 3800 CFM and 150 Pa external static pressure,
Total Static Pressure
Step 3:
From the blower curve, the design requirement calls for RPM about 1380 RPM.
From the table:
In order to obtain 1380 RPM, we calculate the new blower pulley as:
(while maintaining the motor pulley)
Let us take close approximation of 110 mm diameter pulley size
Recheck, with Db = 110 mm
We thus need to change the blower pulley from 125 mm to 110 mm in order to obtain the higher operating
static pressure.
Step 3:
When the pulley is changed, the V-belt length must be rechecked. We have for horizontal air throw
configuration:
We thus can use a belt with a length of 687 mm.
Step 4:
From the blower curve, we can also notice that the motor power input not maintained within the current
operating range of the standard unit's motor.
Summary:
i) Fan motor kW
ii) Blower pulley diameter
iii) V-belt size
Note: Factory supplied rooftop is only with standard drive package.
All other changes are only given as example and need to be field supply.
5. SELECTION PROCESS
ART100A
=
=
=
=
=
Motor pulley
=
Blower pulley
=
Motor RPM
=
Db
=
=
Blow pulley
=
=
V-belt length, L
=
=
=
where, C
=
Db
=
Dm
=
=
=
=
3800
CFM
150
Pa
160
Pa
150 + 160
Pa
310
Pa
106
mm
125
mm
1420
106
x (1420/1380)
110
109.1 mm
1420 x (106/110)
1368.4 RPM
2C + 1.57 (Db + Dm)
(2 x 174) + 1.57(110 + 106)
687.12
distance between the centres of the two pulleys
diameter of blower pulley
diameter of motor pulley
2.2
kW
110
mm
687
mm
49
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