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The
AL-KO THERM characteristic performance curves enable you to
achieve optimum system design because they represent
reference curves which can be compared with the standard curves
of manufacturers. Performance curves take special account
of the losses of a fan integrated in the air-conditioner.
The
characteristic performance curve is determined from the volume
flow, as measured on a test rig by means of an intake measuring
nozzle (standardized as per DIN 24 163) and the pressure difference
assigned to this volume flow, which is measured via the fan
partition in the air-conditioner. At AL-KO THERM, this pressure
difference is referred to as delta pfa.
In
addition to the performance curve of the fan unit, product
dimensioning also considers the rating of the individual components
to be installed. The above data are then used to determine
the product's performance curve. On-site
verification measurements conducted on fully installed systems
permit a high degree of accuracy.
Closed-circuit
measuring system
To
be able to determine the stat. overall feed pressure and pertinent
air output of an air-conditioner by simple means, AL-KO THERM
developed and patented a closed-circuit measuring system.
(Patent-No.P.3703 401).
The
stat. pressure difference, delta pfa, can be measured via
two circuit lines situated at the intake and the pressure
side of the fan partition. Typical performance curves determined
on AL-KO's own test rig enable on-site reproduction of product
performance at any time.
Procedure
1.
Connection of a suitable differential pressure gauge, e.g.
digital manometer, at the closed-circuit connection nozzles,
led through the device.
2.
Transfer of the overall pressure difference measured in the
supplied typical performance curve of the product
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