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Anonymous Poster

Does slower fan consume less energy?

07/01/2010 2:25 AM

If the ceiling fan is on slow speed, does it consume less electricity?
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lyn
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#1

Re: does slower fan consumes less energy

07/01/2010 5:04 AM

Yes
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Anonymous Poster
#2

Re: does slower fan consumes less energy

07/01/2010 6:03 AM

How? Prove with electrical calculations.
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lyn
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#5
In reply to #2

Re: does slower fan consumes less energy

07/01/2010 8:39 AM

Do your own homework.
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DVader1000
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#8
In reply to #5

Re: does slower fan consumes less energy

07/01/2010 9:19 AM

Alright! My latest victim. So what is it now, 10, 12, 15? I've lost track already.

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lyn
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#9
In reply to #8

Re: does slower fan consumes less energy

07/01/2010 9:43 AM

Dammit Vader! I think you've started a pandemic.
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PWSlack
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#7
In reply to #2

Re: does slower fan consumes less energy

07/01/2010 8:58 AM

It's empirical.

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PWSlack
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#12
In reply to #2

Re: does slower fan consumes less energy

12/20/2022 7:21 AM

If power consumed is pressure gain multiplied by flowrate, then lowering the flowrate and reducing the pressure gain by slowing the fan speed will, by any measure, consume less electrical power.

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MACA
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#3

Re: does slower fan consumes less energy

07/01/2010 7:10 AM

V=IR

P=IV

As a mechanical engineer I know it is a fact that all electrical problems boil down to these two equations

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manroop
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#4

Re: Does slower fan consume less energy?

07/01/2010 8:21 AM

Yes, If other parameters like fan blade diameter, Gap between the casing and impeller

( for axial fans),the external air flow resistance etc remain the same. If so since the

air volume (work done )is less as the speed is low, the power consumed will be low.

Manroop.Chennai.
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PWSlack
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#6

Re: Does slower fan consume less energy?

07/01/2010 8:57 AM

The power consumed by a fan is proportional to about the third power of the tip speed, all other things being equal.

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Hameedullah Ekhlas
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#10

Re: Does slower fan consume less energy?

07/01/2010 6:56 PM

check here

http://www.engineeringtoolbox.com/fans-efficiency-power-consumption-d_197.html
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MACA
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#11

Re: Does slower fan consume less energy?

07/08/2010 6:08 AM

Here's a related question. Does an incandecent (don't know how to spell it) lightbulb used with a dimmer consume less power when dimmed than when at full brightness?
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Users who posted comments:

Anonymous Poster (1); DVader1000 (1); Hameedullah Ekhlas (1); lyn (3); MACA (2); manroop (1); PWSlack (3)

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