[Stoves] GLASS for stoves .

[lh cheng]

Dear Crispin,
that is a minor problem, I know the answer. thank you for your introduction
about Franklin stove, I am a little surprised by this man, and curious
about this stove.

2017-12-25 10:03 GMT+08:00 Crispin Pemberton-Pigott <
crispinpigott at outlook.com>:

> Dear LH
>
> That is the theory, but like aluminum, if the processing involves a huge
> amount of energy, ‎you are buying energy with a little glass thrown in.
>
> Even expensive material is really the cost of the energy needed to get it.
> Unless there is a patent. Good cancer medicine is $350 per pill. One per
> day for five year$.
>
> Regards
> Crispin
> *From: *lh cheng
> *Sent: *Sunday, December 24, 2017 20:40
> *To: *Discussion of biomass cooking stoves
> *Reply To: *Discussion of biomass cooking stoves
> *Subject: *Re: [Stoves] GLASS for stoves .
>
> the free material won't change the downside price trend if widely used. on
> the contrary, it speed up that trend. because widely using make price
> nearer to marginal cost, which is near zero, when the material is free.
> Every HI-Tech product have the same trend, like CPU, cell phone, mainly
> made from sand. Because the number of users diluted the initial R&D and
> equipment investment, which is the main cost.
>
> 2017-12-24 18:02 GMT+08:00 Andrew Heggie <aj.heggie at gmail.com>:
>
>>
>>
>> On 24 December 2017 at 01:51, Crispin Pemberton-Pigott <
>> crispinpigott at outlook.com> wrote:
>>
>>> I
>>> Shoes in North America and Europe often have a large glass front window
>>> because fires are social. 'firelight' and all that.
>>>
>>
>> Yes that's my feeling too
>>
>>>
>>> In Africa people are nervous and uncomfortable if they have a stove
>>> without a visible fire. In Namibia we had to ensure the cooking stove had a
>>> visible fire or the San people wouldn't use it.
>>>
>>
>> They won't be keen on electric cooking then?
>>
>>
>>> The cost of the glass is in the preparation and production. The
>>> materials are nearly free so I think the cost will remain high. Unless
>>> there is a miracle formulation.
>>>
>>
>> I'd guess this is so, normal glass is  just silica sand and a bit of lime
>> to decrease the fusion temperature.
>>
>> Borosilicate glass, Pyrex brand here in UK , has a much higher melting
>> point so more expensive, also lower coefficient of expansion, so shock
>> heating or cooling don't build up internal stress.
>>
>> I don't know what ceramic glass is nor why ordinary glass is not
>> considered a ceramic.
>>
>>>
>>>
>>>
>>
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>
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