Fandis invests significant resources in the research and development of cutting-edge technologies to improve the efficiency of thermal management, with a clear mission: to offer products capable of extending the useful life of electrical equipment, improving reliability and reducing energy waste.
Many blog readers have shown interest in some of our recent articles:
- Smart flow control for Fandis roof exhaust units
- Smart flow control for Fandis roof exhaust units: comparison with the traditional system
- How to manage hot spots in electrical panels
If you are among these, you will find what we are about to tell you even more impressive!
In fact, we decided to compare the traditional approach with the most recent solutions introduced by Fandis, i.e. Sensis in ON/OFF mode and Sensis combined with a DC roof exhaust unit, instrumenting a cabinet in our laboratory and measuring the results obtained.
The test cabinet
We set up a standard electrical cabinet in the laboratory, with an average ambient temperature of around 25°C, while maintaining the temperature inside the cabinet at a maximum value of 35°C. We applied an internal thermal load of approximately 800W and calculated, thanks to our free calculation software, a cooling volumetric flow rate of around 450m³/h.
The main heat source is concentrated in a hot spot of approximately 750 W at a height of 400 mm from the bottom of the cabinet, while ventilation is based on a roof exhaust unit and an FF15 inlet filter on a wall, just above at the bottom.
We simultaneously conducted the measurement of the power absorbed by the roof exhaust unit and the recording of the stratified temperatures in the cabinet through the use of a wattmeter connected to the fan power supply and three thermocouples arranged at various heights. Sampling was carried out with an interval of 10 seconds for a total duration of 5.000 samples (equivalent to approximately 14 hours).
For each of the configurations being compared, we examined the maximum temperature values reached in the eight different stratifications and calculated the total energy consumed by integrating the power absorbed over the entire duration of the test.
First test: traditional system
We controlled the activation of the fan using a bimetal thermostat, positioned approximately 300 mm from the roof of the cabinet and with the set point set at 35°C. In this case, the extraction tower used an AC fan powered by 230V.
The orange curve is the one detected highest up, near the regulation thermostat, the gray one represents the one closest to the hot spot, while the blue one is that of the incoming fresh air.
As we can see, thanks to the placement of the thermostat in the highest area and the well-balanced sizing of the cooling system, the system manages to avoid temperature drifts, maintaining it between 28°C and 46°C, both in the upper region and near the hot spot.
The energy consumption of the system totaled in the sampling period was a total of 785 Wh.
Second test: on/off control but based on Sensis digital regulator
The Sensis regulation system was installed in the same position as the thermostat in the first test, but the availability of two remote sensors was used to simultaneously detect the temperatures in different points of the cabinet and prevent hot spots.
The graph shows how the narrow hysteresis of the regulator and the speed of intervention manage to limit overshoots to a maximum of 2°C above the set point, both in the highest area of the cabinet and in the hot spot area. However, there is a second, not insignificant advantage: in the same period of time, the wattmeter recorded an energy consumption of approximately 710 Wh compared to the 785 Wh of the traditional solution.
Third test: proportional control with Sensis digital regulator and DC roof exhaust unit
We replaced the traditional roof exhaust unit with a TP19UD24, with slightly superior aeraulic characteristics but with the possibility of modulating the speed according to the real cooling requirement, and connected the PWM output of the Sensis regulator to the fan control signal.
Thanks to the direct current fan technology and modulation, surprising results were obtained: the temperature in the hot spots remained constantly around 35°C, while energy consumption was drastically reduced to just 170 Wh, less than a quarter compared to traditional solutions.
These results clearly demonstrate the extraordinary effectiveness of Fandis’ new solutions in climate control, a true revolution for the sector, with a view to a concrete reduction in energy consumption and an increase in the reliability of electrical equipment.