Re: Water kettle energy consumption logging

On Tue, 17 Dec 2024 02:00:42 -0000 (UTC), Wu Ming <[email protected]
> wrote:

>legg <[email protected]> wrote:
>> For 'efficiency' in this case, the dominating factor is 
>> heat lost from the object, not rates or patterns of input.
>> 
>> Layers of insulation, lowering the external skin temperature 
>> will produce the best efficiency, regardless of the 
>> temperature within the container.
>> 
>> RL
>> 
>
>We need hot water within seconds. We need it at boiling point for tea and
>also sanitation. The latter more for old mental habit than real threat I
>think. So a kettle with instant heating capability won’t do. We need a
>reservoir of water at almost boiling point readily available. 
>
>Kettle has insulation already. Possibly because of the 6 hrs delay option.
>I won’t add more insulation to it. 
>
>If mass and insulation aren’t further optimizable what is left is
>temperature. We don’t use hot water form the kettle all the time. Hours
>pass by without any use. 
>
>98° is the operating temperature. I can temporarily lower it to 90°, 80° or
>60° for the lengthy periods we don’t expect the need for water at 98°. Or
>let it fall for six hours straight. Is it worth it? Will try estimate using
>the producer’s data I discovered yesterday. Fallback options are measuring
>heat loss over time with a meat thermometer. Or directly measuring energy
>required at the plug.

For every square cm of outer surface area you will lose 1mW for every 
degree C external surface temperature rise. +-10%.

This power loss is supplied by input power.

More losses occur through conduction of connecting pipes or wiring.

RL