Re: Water kettle energy consumption logging

On Wed, 18 Dec 2024 16:55:14 -0000 (UTC), <[email protected]> wrote:

>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
> 

The common solution with 'flash heaters' is to turn the system 
on x minutes prior to use and turn it off when the demand ceases.

RL