[Stoves] solar cooker response (changing thread name)

[Nikhil Desai]

Andrew, Crispin:

>From December 2012, a consumer rating of induction cookstove efficiencies.

Nikhil

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


On Mon, Jun 12, 2017 at 5:14 PM, Andrew Heggie <aj.heggie at gmail.com> wrote:

> On 12 June 2017 at 21:39, Crispin Pemberton-Pigott
> <crispinpigott at outlook.com> wrote:
> > Dear Andrew
> >
> > When we were looking at the claim that simmering a pot could produce an
> 'efficiency' and fuel consumption 'per litre simmered', Yixiang and I
> investigated induction cookers in the 1800-2100 W range. All were single
> plate, like a gas fired wok cooker. Some have six settings for power, down
> to 300 W.
>
> Unfortunately this one only goes down to 450W in 9 steps but I see a
> hay box as being complementary to it.
> >
> > The 88% efficient were marked C, the 90% were marked B and the 92% were
> rated A. That is a Chinese national rating system.
>
> I cannot see a rating on mine, as most electrical goods on sale here
> it is made in China.
> >
> > ‎In Canada there were, for a time, no powerful ones. All were under 1
> kW.  It could easily be run on a 1 kW inverter. Given the coincidence  of
> the voltage being half and the power being half, I am wondering it the guts
> are same, just that it runs on a lower voltage. They are still rare in
> Canada except for expensive built-ins, 4 or 5 plate glass tops.
>
> I'm guessing the electronics rectified from our 240V supply and then
> the frequency for the induction reformed so it probably has a DC bus
> if one were clever enough to know what to do.
> >
> > That is all an aside. What we measured was the direct heating of the
> water and it was a lot less than 90% efficient. The stability of the power
> consumption was excellent. Yixiang reported the efficiency in the 70's.
> ‎It is possible that the pot itself has an effect of the efficiency of the
> induction. That is going to affect the battery life.
>
> In the early days of playing with TLUD I did use the weight of water
> evaporated by the dry weight of wood burned for my efficiency tests.
>
> I can do so again for this if you suggest a protocol. I only have
> kitchen scales.
>
> Andrew
>
>
>
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