[Stoves] solar cooker response (changing thread name)

Nikhil Desai pienergy2008 at gmail.com
Tue Jun 13 08:57:05 CDT 2017


Andrew:

Let me query a bit more -- why is efficiency "significant on the global
scale"?

There are economic values to a resource. Such values are context-dependent,
there is nothing "global" about it. (Unless one has some multi-decadal
Integrated Assessment Model for Climate-Economy interactions, when the
product of uncertainties is too huge to bother about efficiency metrics of
mere cookstoves.)

I am confused -- why do you say that the result was not inversely
proportional to rated power? The more powerful appliance (kettle) did take
less time. Or am I missing something?

Nikhil

------------------------------------------------------------------------
Nikhil Desai
(India +91) 909 995 2080
*Skype: nikhildesai888*


On Tue, Jun 13, 2017 at 6:19 AM, Andrew Heggie <aj.heggie at gmail.com> wrote:

> On Mon, 12 Jun 2017 19:57:45 -0400,Nikhil Desai <pienergy2008 at gmail.com>
> wrote:
>
> >Andrew:
> >
> >You ask, "I aslo (sic) wonder how a 900W microwave compares if it is only
> >heating for a few minutes."
>
> That's my two finger typing getting letters mixed up!
> >
> >Comparing what? I don't know about energy efficiency, nor do I care,
> though
> >my sense is, the induction stove is quicker. I would put a mug of water to
> >boil in a microwave, half a liter in a kettle, and two liters on an
> >induction stove.
>
> I take the point about efficiency, it's cost that matters on the household
> scaly even though efficiency is significant on the global scale.
>
> My first quick test was to boil 1 litre in a 3kW plastic kettle and the
> same amount on the induction hob. Both kettle and hob sensed the point of
> boiling though the kettle let the water boil for longer before switching
> off.
>
> The 3kW kettle took 2minute 20 seconds, the 2.1kW induction hob 5 minutes
> 30 seconds but of course the steel pot would have more energy to heat up
> plus bigger losses due to convection and evaporation, even so I was
> surprised that the result was not inversely proportional to rated power. I
> will have to try both again with a power meter to see axtual electricity
> consumption.
>
> Andrew
>
>
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