Re: Water kettle energy consumption logging

wrote in message news:[email protected]...

Wu Ming <[email protected] > wrote:
> <[email protected]> wrote:
>>> Watt-hours. Required to keep water around the temperature on the first
>>> column.
>>>
>> Then I'm confused.....
>>
> We have a Chinese model. I don’t read Chinese but just realized that
> version of the manual shows W/h. The English version has Wh instead. Even
> without knowing before I assumed what they meant was watts per hour. It
> won’t make sense otherwise.

In this context neither watt-hours nor watts/hr make sense.

"...keep water around the temperature..." implies a steady state
process. That is expressed in energy per unit time. A watt
is exactly that unit, expressed in joules per second.

It seems likely that something got scrambled in translation.

Regardless, Jim Wilkins has, I think, expressed the solution:
Keep the average temperature as low as possible to maximize
the efficiency over the timescale of interest.  Unless there's
a known schedule for demand the only solution is to keep the
water at the required temperature continuously.

hth,

bob prohaska
-----------------------------------
After heating water to percolate with 900W my coffee pot drops to 47W 
(measured) to keep it warm. Those numbers weren't unreasonable as Wattage.