Axial innen engl - TLT Turbo GmbH

Am Weinberg 68 · D-36251 Bad Hersfeld/Germany
Phone: +49.6621.950-0 · Fax: +49.6621.950-100
Rating sheet for a volume flow
measuring system
Example given for an AXN
12/56/1000 axial-flow fan
Differential pressure [Pa]
900
800
700
600
500
400
300
200
100
Density 1,2 kg/m 3
Density 1,1 kg/m 3
Density 1,0 kg/m 3
Density 0,9 kg/m 3
Density 1,3 kg/m 3
VOLUME FLOW MEASURING SYSTEM VME
FOR AXIAL-FLOW FANS
Nominal size NG 1000
Rotational speed n 1500 rpm
Tip speed u2 79 m/s
Density 1,2 kg/m3 Dynamic viscosity � 1,80E-05 Pa s
Reference cross-section A ring 0,5391 m 2
Reference diameter Dh ref 0,8285 m
Rated fan total pressure increase dpt 500 Pa
Rated volume flow VA 45000 m3/h Rated flow within measuring range* VA > 32100 m3/h Correction factor at VA k 2,13
Differential pressure under rating conditions dp 71 Pa
* At smaller volume flows the differential pressure values are of insufficient magnitude.
The accuracy of the volume flow measuring system depends on the pressure gauge employed as well as on the flow approach situation. Under unperturbed
incoming flow condition and taking into account the inlet density, the tolerance is approx. 5% of the actual volume flow value.
Input data Calculated data Operating limits
�
0
0 20000 40 000 60 000 80 000 100 000 120 000
Volume flow [m 3 /h]
024