Airflow Measurement By Differential Pressure Measurement At The Fan Nozzle - Trane CCEB Installation Operation & Maintenance

8.1.2 Airflow measurement by differential pressure measurement at the fan nozzle

If the fan is provided with pressure test points for airflow measurement and yellow test points are
provided on the outside of the fan unit (accessories are indicated on the technical data sheet), a
differential pressure signal can be taken.
The following formula can be determined from the pressure signal of the airflow:
The corresponding K-factor of the fan is shown in the fan-motor data sheet or on the technical data
sheet provided by TRANE.
The air density at the measuring point is to set up manually, depending on altitude, temperature
and humidity. In most cases, 1.2 kg/m³ is a suitable value.
Note: If in the TRANE delivery the device for airflow measurement is included, this must be config-
ured on site in responsibility of the client before commissioning.
Air flow measurement type SENSO
The specified K-factor corresponds to the K-factor necessary for SENSO airflow measurement.
Following you will find the instructions of the manufacturer.
V = Airflow [m³/h]
h
K = K-factor [m²s/h]
∆p
= Differential pressure [Pa]
ρ
= Air density [kg/m³]