[Stoves] Stove competition on The Mall

[Crispin Pemberton-Pigott]

Dear Steven

It must have been provided by Okofen.  The generator is a Qnergy 7.1 kW unit derated for the product they are building.

http://www.okofen-e.com/en/pellematic_e_max/

It has an overall efficiency (electrical) of 10% so it is only applied to their 50 kW furnaces (as far as I hear).

The generator is particularly complicated and particularly expensive. It has helium running at 50 bars moving through really expensive thin pipes.

I asked them for a smaller unit and they offered to build one if I gave them a million $ worth of orders. At present there is no economically viable small generator save TEGs which are not very efficient and amazingly fragile, thermally speaking.

Incidentally the efficiency of the Qnergy unit calculated on the basis of how much of the absorbed heat gets turned into electricity is 45% which is amazing. That relates to the internal workings, not the heat available from the gas stream.

We can count this as an as-yet-unsolved problem.

Regards
Crispin


Crispin - the 5 kW stove charging the Tesla was a wood pellet unit with a Stirling engine made by Okofen.


From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Crispin Pemberton-Pigott
Sent: November 19, 2018 11:26 AM
To: 'Stoves (stoves at lists.bioenergylists.org<mailto:stoves at lists.bioenergylists.org>)'
Subject: [Stoves] Stove competition on The Mall

Dear Friends

https://mha-net.org/docs/v8n2/v8n2.htm<https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmha-net.org%2Fdocs%2Fv8n2%2Fv8n2.htm&data=02%7C01%7C%7C4b719eed98de45273ea308d64e4d3d47%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636782490974672056&sdata=jyy6u291icEqmY4AnF%2BAY4%2Bm2ro0PfwGE1cQVy7SKHY%3D&reserved=0>

That is Norbert's page. There are some photos from the competition. Notice the extremely clean burning downdraft stove. Perhaps it is catching on (finally) after 300 years. That on is super-clean, at least it is when running at high power.

There was a Tesla being charged by a pellet stove with a 5 KW electrical output (probably a Qnergy unit). They are available in Sweden though it is an American company.

Regards
Crispin

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