How does smart flow control work on roof exhaust units if compared to a traditional system? If you have read our previous article, you will know that we have introduced a new temperature regulation system on our roof exhaust units, based on Sensis, listing its advantages in terms of silence, data collection and energy efficiency.
Today we will deepen this last benefit, comparing the system in question with a traditional solution, using a concrete application example, created in Fandis laboratories, where the applications of our customers are replicated and simulated.
Laboratory test and comparison with a traditional system
We use the thermotechnical calculation software (available for free on Fandis website) and calculate the volumetric flow rate required for a typical cabinet that needs the application of our roof exhaust units: an enclosure made of 1.5mm painted sheet metal, measuring 600x600x1800mm, with production of internal heat of about 800W.
Considering installing the cabinet in a covered environment, with a maximum room temperature of 30°C, and regulating the internal one to a maximum value of 35°C, the necessary volumetric flow rate, for the most extreme conditions, will be around 450m³/h.
The traditional solution involves a TP19U230B coupled to an FF20A input filter, with an operating point coinciding with our goal and with an absorption of 69W at 50Hz.
By installing the new DC fan (TP19UD24) and with the same inlet filter, we can reach, at maximum rotation speed, a maximum flow rate at the working point of 550m³/h, approximately 22% higher, but with a power absorption equal to 95W.
However, we must remember that, since it is a modulating system, we will never work at maximum speeds and that the highest working point calculated for our application is 450m³/h.
In the following graph, we see the family of flow rate/absorbed power curves of our classic roof fan TP19UD230B. If we pay attention to the maximum working point, calculated for our application at 450m³/h, the new system controlled by Sensis stabilizes at a rotation speed of around 80% with an absorption of only 59W.
The advantage in terms of energy efficiency
The real advantage in energy terms therefore derives from the scalability of the power according to the real instantaneous need, and so let’s go further. The working point of 450m³/h was determined to satisfy the most extreme conditions, with an ambient temperature of 30°C. If we assume that for most of the system’s operating time, the real ambient temperature almost never realistically goes above 25°C, the instantaneous volumetric flow rate will remain around 200m³/h, with absorption falling below 20W.
With the traditional solution, we can only act through a thermostat, accepting an oscillatory behavior of the temperature and a higher degree of noise at maximum speeds. With the technique based on the integration of Sensis and direct current roof extraction towers, instead, TP19UD24xx and TP19UD48xx, we have consumption for heat dissipation proportional to the real requirement and a more silent system.
This is yet another example of how our new algorithm allows numerous advantages and greater efficiency in the thermal management of an electrical panel.
To find out more about all our enclosure products, keep browsing our blog, visit our website fandis.com or send an email to support@fandis.com. Our staff will answer you as soon as possible.
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