[Zurück]

S. Cerimovic, A. Treytl, T. Glatzl, R. Beigelbeck, F. Keplinger, T. Sauter:
"Thermal Flow Sensor for Non‐Invasive Measurements in HVAC Systems";
Vortrag: Eurosensors 2018, Graz, Österreich; 09.09.2018 - 12.09.2018; in: "Proceedings - Eurosensors 2018, Graz", MDPI, Vol. 2 (2018), ISSN: 2504-3900; S. 1 - 5.

We present a feasibility study on non‐invasive flow rate measurements in heating,
ventilation, and air conditioning (HVAC) systems utilizing thermal transduction instead of
commonly used ultrasonic techniques. The investigated thermal flow transduction comprises two
temperature sensors and a heater, all mounted non‐invasively on the outer pipe surface and,
therefore, not disturbing the fluid flow inside. One temperature sensor measures the heater
temperature, whereas the other one, mounted upstream of the heater, follows the fluid temperature
for reference. The temperature difference (i.e., the heater excess temperature) depends on the fluid
velocity and can be used to derive the mean volume flow inside the pipe. In order to visualize and
study the temperature field, a finite element method (FEM) model of the system was implemented.
Measurements conducted with the sensor prototype confirm the feasibility of this approach.

thermal flow sensor; non‐invasive flow rate measurement; HVAC systems

http://dx.doi.org/10.3390/proceedings2130827