38 lines
1.5 KiB
Markdown
38 lines
1.5 KiB
Markdown
# Fan Control
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Trying to decide which fan to use and how to control it.
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# Test
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Basic maths says even some 80, but definitely 92mm PC fans should move enough
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air in a standard 15m2 room, ie change the room air in 2 hours.
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Since lower rpm usually means quieter, we are also testing 120mm.
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## List of fans
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All tested fans are on the quiet side. Some have it in the name, but they are
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all under 20db under full load. Some have pwm control built in, which i am
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thinking is less relevant than i thought.
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In my setup i am testing with a Pi Pico and measuring with a **telephone**
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(Sound Meter), from about 50cm and 2m. Not too accurate, but ok, ambient at
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6-9db.
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15m2 at 2.5 m height is about 20m3 / h for compliance.
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Fan | mm | V | mA | Wire | rpm | m3 | db | 40cm | 1m | Notes
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---------|------|-----|-----|------|------|-----|----|------|-----|-----
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Zephyr | 60 | 12 | 110 | 3 | 2000 | 17 | 18 | 10 | 16 | Notes
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Zephyr | 80 | 12 | 160 | 3 | 1400 | 47 | 14 | 40 | 13 | Notes
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Zephyr | 92 | 12 | 140 | 3 | 1300 | 57 | 14 | 45 | 14 | Notes
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Zephyr | 120 | 12 | 180 | 4 | 1400 | 81 | 15 | 50cm | 2m | Zapped
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## Conclusions
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So far the fans ahve been surprisingly quiet. At close proximity the phone seems to pick up the air movement as noise. It was a scenario created to distinguish
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the leels better, it would be impossible to get this close. An average real life
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distance would be 2-3m, but at that distance all the fans a are too quiet to
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measure (a good thing!)
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# Decisions
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