[Stoves] TEGs

[Sluis, Paul van der]

Dear Andrew,

The overheating can be solved by insulation limiting the maximum temperature.

The problem is the cycling. If the TEG should survive 5 years and the stove is used 2 time per day, the TEG is heated almost 4000 times. The TEG is thin (typically 4 mm), is made of brittle materials, and is heated on only one side (the other side should stay cool to survive). In addition there are typically 512 solder joints in series. If 1 fails, the whole device fails. That is the technological challenge.

Furthermore, the TEGs contain Telllurium. From an environmental aspect Philips does not want to use such materials.

Combined with lower prices for solar and more reliable cheaper batteries the choice becomes clear.

Kind regards,

Paul.


 Take care of the environment, print only if necessary ...

-----Original Message-----
From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of ajheggie at gmail.com
Sent: dinsdag 14 juni 2016 23:19
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] TEGs

[Default] On Mon, 13 Jun 2016 14:54:32 +0000,"Sluis, Paul van der"
<paul.van.der.sluis at philips.com> wrote:

>TEG’s are not reliable enough for stoves that are started and stopped many times. Plus the fact that solar prices have come down significantly, the Philips stove is now solar powered. That also solves the issue of people running the stove to create a small amount of electricity.

What affects the TEGS to make them less reliable, is it overheating?
>
>The price of a TEG stove with small battery or a solar stove with large battery is not very different. Both need electronics. Both have to be solidly build with quality materials. It all adds up. Then comes transport and import duties. That makes them relatively expensive.

Excellent post, thank you Paul, fits with what I had been thinking but good to hear from someone professionally involved in the science.

Andrew

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