[Stoves] TEGs In-Reply-To=%3C9pc0kb1vrd6p4omok6ncg7iqig2cgfrf3j%404ax.com%3E

Crispin Pemberton-Pigott crispinpigott at outlook.com
Wed Jun 1 08:02:15 CDT 2016


Dear Paul vd S

 

I appreciate you presenting this information. There is a great deal of merit
in the use of such systems on stoves - largely because of the control it
affords over power. 

 

There are other devices which can generate the power needed to operate a fan
(or other appliance) and multiple variants of the TEG. In future these will
be more important than they are now as the power and efficiency rises. At
that time the discussion about fuel consumption to feed the electric power
generators will be very relevant.

 

The small stoves with a limited power generating capacity (5W or so) sold in
Uganda are, I hear, increasing fuel consumption because people use the stove
all day to power a radio. In other words the problem has already been
manifested, and it will have to be addressed by stove promotion programs.

 

I trust you are well.

 

Thanks

Crispin

 

 

Dear AJH,

 

The Philips stove does NOT use significantly more fuel because of the
attachment of the TEG.

The TEG unit takes around 100 W of heat from the fire. 98W is waste heat of
the unit (2% efficiency). That 98 W is recirculated into the fire because it
is used to preheat the combustion air.

The remaining 2W is fed to the fan. In the fan 1.8W is transformed into heat
(just 10% efficient). Also this 1.8W is fed back to the fire.

So just 0.2W is actually taken from the fire. An estimated 80 % of that
power is lost as pressure drop over the nozzles that feed the fire with high
velocity air. That loss is gain transformed into heat that comes into the
fire.

So the real power taken is around 0.04W. That needs to be compared to the
power produced: 4000W. So an estimated 1/100000th extra fuel might be
required.

The might comes from the fact that in this case the energy lost is caused by
the kinetic energy of the air moving away from the fire. But even a natural
draft stove has these losses.

 

So it is safe to assume that with the Philips construction NO additional
wood is required because of the use of a TEG.

 

Kind regards,

 

Paul.

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

 

 

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