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Posted by Mark H on May 27, 2008, 11:07 pm
> wrote:
>
>> I've always wondered how much it would cost to run the fan 24/7...
>
> About $24/months. (wow) Read on...
>
> One horsepower equals 746 watts.
>
> Of course, according to my engineer/friend, that is given 100% power
> factor and other mumbo-jumbo.
>
> Also, a typical blower motor is 1/2-horsepower. In any case, I'll use
> that in my calculation as I have always wanted to estimate the CO$T of
> running my blower 24/7.
>
> My friend said he was being generous when he claimed my motor might be
> delivering at 80% efficiency. I asked him to guesstimate a WATT amount
> for my motor: 500. OK. We'll use that.
>
> Now, how much for the electricity?
>
> Omaha Public Power District's highest residential rate is 8.66-cents per
> kWh. I *LOVE* my "cheap" power!
>
> (I feel sorry for you poor slobs that are - and always will be - paying
> for a brand new nuke that was decommissioned mere days prior to its
> going on-line.)
>
> OK. 10-cents/kWh is a good rate to use.
>
> How often would a system CYCLE (turn on-then-off) in a 24-hour period?
>
> Just for the sake of our little calculation, let's say the system would
> cycle and run for 1/3 of the time.
>
> Using the above figures, the 24/7 blower would cost $1.20/day.
>
> The cycling blower would cost 40-cents/day.
>
> The difference is 80-cents/day time 30 days = $24.
>
> $24 EXTRA per month to run the blower continuously.
>
> Hmmmmmm... That's somewhat more than I had expected. It is
> considerable.
>
> I may think twice before switching the system from AUTO to ON next time.
> --
> :)
> JR
At the same time my unit has multi speeds on the fan.
When I turn the fan to on the fan runs at the lowest
speed. I would need to find the manuals but this may draw
a lower wattage.
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