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Fri, Feb 3, 12 at 11:32
| We need a ceiling fan w/60" blades for our family room and have narrowed our choice down to two. We don't know how to determine which will be more efficient, electricity-wise:
Fan "A":Airflow: 6967 CFM, elec use: 88 watts, Airflow efficiency: 80 CFM/watt Fan "V":Airflow: 4646 CFM, elec use: 12 watts, Airflow efficiency: 384 CFM/watt Please give me your advice. Thanks. |
Follow-Up Postings:
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- Posted by david_cary (My Page) on Sat, Feb 4, 12 at 6:09
| Those numbers can't be right but if they were, Fan V would be more efficient. There shouldn't be a nearly 5 fold difference in efficiency for a typical a/c motor. They should be in the 60-120 CFM/watt. So the 80 is probably right and the 384 is not. |
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- Posted by functionfirst (My Page) on Mon, Feb 6, 12 at 8:54
| Thanks. Perhaps it's a typo in the advertising and the airflow efficiency is 84, but I will follow up with the company to double check. If that's the case, however, is fan V still more efficient? Also, if it helps, fan A has a "premium power 188x25 mm torque-induction motor," and fan V has a "premium power 165x25 mm dc motor." |
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| Did you use this resource? http://www.energystar.gov/index.cfm?fuseaction=find_a_product.showProd uctGroup&pgw_code=CF |
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- Posted by weedmeister (My Page) on Mon, Feb 6, 12 at 19:28
| A DC motor? What is converting the AC in your house to DC? and how many watts is it consuming? |
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- Posted by functionfirst (My Page) on Tue, Feb 7, 12 at 10:59
| I will check that website, thanks ionized. Re the motor (from the fan website--Monte Carlo, BTW): I don't know anything about dc motors except my sewing machines have them, too, and if they are converted, I don't know what is converting them. |
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