Re: Water kettle energy consumption logging

Wu Ming <[email protected] > wrote:
> <[email protected]> wrote:
>> Water kettles seem pretty close to 100% efficient at turning electical 
>> energy to heat. Are you trying to measure heat losses to the environment? 
> 
> No. I want to find the minimum period at which T at a lower setting is
> convenient. 

But that's exactly determined by losses to the environment, as it's the
only place the energy can go.
 
>> A more detailed description of your experiment would help this reader.
>> I'm presently baffled as to your intent.
>> 
> 
> We are not sure setting T at 60° for few hours is more efficient than
> letting it at 98° and consume just the keep warm rate. Or setting it Off
> for 6 hours, or at 90° or at 80°. The other three settings available on the
> kettle.
> 
> Producer publishes the keep warm average power consumption with 4l of water
> and 20° outside T:
> 
> T° C    Wh
> 98      49
> 90      43
> 80      35
> 60      23
> 
> With some approximation I can calculate the energy required to re-heat to
> target T. And compare with the above. Improvements to this stub method?

The units above don't quite make sense. Is the "Wh" column watts, or 
watt-hours?

If it's watts, the manufacturer has already measured what you need to solve 
the problem. If it's watt-hours I'm confused.  

bob prohaska