I think they are regarding all mechanical losses as heat, which is then=

used for local heating, rather than producing electricity.
On this basis, the only losses are the burner losses, which may well  b=
e
90% efficient I guess although I would have thought that 10% wastage go=
ing
up a flue would be about as good as you could ever expect. (Not to ment=
ion
unburnt fulel particles). I'm no expert here though.

This does seem to infer that the device is positioned so that any local=

heating is of benifit to the user and is not just heating up waste spac=
e in
a basement or garage or garden shed etc.

Also, bear in mind that these units are somewhat expensive and that the=
y
are still in pilot stage - there may be reliability issues or service c=
osts
to be added to the final equation.

Richard P


I do not belive the 90 percent efficiency claimed by them. It cannot be=

that good, due to the fact that there has to be major leakage (heat)
between the hot side and the cold side of the piston. Even if the 'bloc=
k'
is plastic, there will still be a major heat loss. A burner (heat sourc=
e)
can be 90 percent efficient, but any moving parts are going to shoot th=
eir
claimed efficiency specs down. If the efficiency was that good, they wo=
uld
be all over the place, especially in off the grid and isolated location=
s.

Heat (as a byproduct) can be used to make cold air as well-so the unit
could heat in winter and cool in summer.

Flame suit on, fire away.

Art

At 04:34 PM 4/6/04, you wrote:
>http://www.whispergen.com/
>Trials appear to be underway but I haven'r heard much about them for a=

year
>or so.
>Richard P
>
>
>
>
>
>Do you have som epointer for more info about "Whispergen"?
>
>/Ake
>
>-----Ursprungligt meddelande-----
>Fr=E5n: pic microcontroller discussion list
>[mailto:PICLIST@MITVMA.MIT.EDU]F=F6r Richard.Prosser@POWERWARE.COM
>Skickat: den 6 april 2004 22:07
>Till: PICLIST@MITVMA.MIT.EDU
>=C4mne: [OT:] Superb low temperature differential Stirling Engine
>
>
>[Topic Added]
>I think this is the philosophy behind the "Whispergen" stirling
>engines. -
>Electricity is produced as a by-product of home heating.
>RP
>
>
>
>Sorry 137 KWh a day is the correct value.
>
>-----Ursprungligt meddelande-----
>Fr=E5n: pic microcontroller discussion list
>[mailto:PICLIST@MITVMA.MIT.EDU]F=F6r Ake Hedman
>Skickat: den 6 april 2004 11:02
>Till: PICLIST@MITVMA.MIT.EDU
>=C4mne: SV: SV: ] Superb low temperature differential Stirling Engine
>
>
>But if you use a higher temp difference.
>
>In my case I warm the house with pellets and say I have a stirling
>engine in a pre stage to my heater. pellets burn with a temp around 12=
00
>C
>
>1200 + 273 - 300 / 1475 =3D 79%  1/3 =3D> 27% This goes to the electri=
c
>generator.
>
>I guess the losses are in heat so it can be used it to warm the house.=

>
>I use about 1000 kg of pellets a week for warming in the winter ( big
>house ). The total energy used a day is thus 1000 * 4.8kWh =3D 4800 KW=
h
>Say I have 20% efficiency for the electivity generator I can take out
>960 KWh a day in electric energy!!! and have the rest left to warm the=

>house.
>
>Do I have a fault in my thinking here?
>
>
>
>
>
>
>
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=

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