I have long wanted to see how suitable radial fans (snails) are for home ventilation. Studied the Polish boiler fan.
I hope you're not too tired of my fans yet. :)
I am researching different and looking for the perfect one for use in a homemade home ventilation unit.
Fan MplusM WPA-140 with wheel motor ebmpapst advised in the comments abadoh and I decided to measure how it would behave with and without a filter at different supply voltages.
The fan casing is made of aluminum; a junction box is fixed on the back side.
Rectangular exit 70x91 mm. The area of the opening is 6370 mm², which is even less than the area of a round duct of 100 mm (there 7854 mm²). Below is a damper that closes when the fan is not blowing.
Ebmpapst R2E140-AE77-C3. It's funny that in Russia the entire fan costs about 7,000 rubles, and such a motor-wheel is separate from 17,000.
To test the fan, I put it in a cardboard box, instead of one of the walls of which there is a cabin filter for Nissan Murano and Teana, 270x277 mm in size.
I measured the air flows with and without a filter and calculated its flow at different voltages.
The impeller of the anemometer is installed at a distance of 5 cm from the outlet of the fan pipe. The noise was measured at a distance of 1 m from the fan.
The results were quite unexpected.
The fan didn't care if there was a filter in front of it. A very small difference was recorded only at the lowest speed.
At the nominal voltage, the fan makes a very, very loud noise and, according to my calculations, gives about 300 cubic meters per hour (the passport indicates a capacity of up to 395 m³ per hour).
The fan cannot run completely without noise.
At a supply voltage of 110 V and a productivity of 138 m³ per hour, the noise at a distance of 1 m was 50 dBa.
The fan becomes quite quiet at a voltage of 70 volts, while it gives 80 cubic meters per hour. But then another problem appears - the fan rumbles quietly and this can be heard (perhaps I came across an unsuccessful copy).
I made a small video in which this sound is heard.
https://www.youtube.com/watch? v = 3OUvaW2pBZU
In general, a radial fan (volute) is much better than an axial fan - due to the high pressure, its performance practically does not decrease when using a filter (for axial fans it often drops by half).
I had an idea: the cheapest filters for homemade home ventilation are car cabinets. Why not try using a car stove fan? For example, the VAZ-2108 has a radial fan, the same "snail" and it costs 1,300 rubles. I'll have to take it, try it.
© 2021, Alexey Nadezhin
For ten years I have been writing every day about technology, discounts, places of interest and events. Read my blog on the site ammo1.ru, in LJ, Zen, Mirtesen, Telegram.
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