On Wed, 25 Jun 2008, Kilian CAVALOTTI wrote:
For washing machines the energy efficiency scale is calculated using a cotton cycle at 60°C (140°F) with a maximum declared load. This load is typically 6 kg. The energy efficiency index is in kW·h per kilogramme of washing. """ http://en.wikipedia.org/wiki/European_Union_energy_label
Yeah, I saw your post. Vincent left off the "hour" from kW-hours. That makes more sense.
If it IS heating water, then you need to be very careful. It takes a certain number of joules to heat water, period.Yes, but again, to produce that certain amount of heat, it may require more or less electric energy depending on the efficiency of the conversion. Although I assume most components probably do about the same, ball park. I would think efficiency is more a determinant factor in motors, for instance.
All energy conversion for heating water with electricity is joule heating, almost certainly. So it is one to one -- one joule of energy as electricity to add one joule of heat to the water. Efficiency variation only associated with variations in e.g. insulation of the reservoir. The motors might have differential efficiency, but a factor of three is a LOT. That a suggests completely different process. rgb
Cheers,
-- Robert G. Brown Phone(cell): 1-919-280-8443 Duke University Physics Dept, Box 90305 Durham, N.C. 27708-0305 Web: http://www.phy.duke.edu/~rgb Book of Lilith Website: http://www.phy.duke.edu/~rgb/Lilith/Lilith.php Lulu Bookstore: http://stores.lulu.com/store.php?fAcctID=877977
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