Is the electrical fan conversion any good?
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06-14-2009, 07:15 PM
Post: #25
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jondee86 Wrote:Now, the Fan Laws say that the power absorbed by a fan varies as the I've been taking a look at fan related websites..for example: http://www.engineeringtoolbox.com/fans-e...d_197.html If I punch in some numbers, say 1500CFM =~2000m2/h at any pressure rise (usually negligable in cars) I come up with an "ideal "power consumption of between 0.04 and 1.00 kWatt.. more or less in line with what I expected.. You have to punch in some crazy numbers to explain an 8hp drain. For example: - that the fan has to work against a pressure difference of more then 2Bar (usually in a car, the pressure tends to work in your advantage..the little fan certainly isn't able to bring underhood pressures to anything remotely positive...wish it could though..cheap boost!) - the fan is pushing more then 10.000m3/h..or around 6000CFM! (for reference..big block V8 dragster fans..designed for short and heavy loads in circle track and dragracing push around 3000CFM.) - some very poor efficiency numbers..only possible if toyota got the design completely wrong.. Would love to see some some fan-law calculations to see in which ballpark they end up.. My feeling is that its between 0 and 1 hp (@crank). Look at it from another perspective..an electric fan replacing the OEM fan would have to pull similar numbers.. lets say its about 50% more efficient (huge!) then it would be close to a 4kW current draw.. any idea how long the combination of alternator and battery would sustain that? (stock alternator =~ 1kW). A wheel to steer the front of the car A pedal to steer the rear |
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Messages In This Thread |
Is the electrical fan conversion any good? - heshan - 05-01-2009, 08:34 PM
[] - Jango_Fett - 05-01-2009, 09:48 PM
[] - Serencebey - 05-03-2009, 06:24 PM
[] - Jan Pedersen - 06-08-2009, 10:00 PM
[] - NoHachi - 06-14-2009 07:15 PM
Engine driven vs electric cooling fans... - jondee86 - 06-15-2009, 07:40 AM
Re: Engine driven vs electric cooling fans... - Gnugfur - 06-18-2009, 05:48 AM
Re: Engine driven vs electric cooling fans... - jondee86 - 06-18-2009, 07:30 AM
Re: Engine driven vs electric cooling fans... - Gnugfur - 06-18-2009, 07:32 AM
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