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Domestic Steam Engine Chris Edwards 03-29-2008
Posted by :Jerry: on March 30, 2008, 6:28 am
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<snip useful but largely irrelevant talk about commercial (24/7) power
generation>
>
>
> In short... nice thought, shame about the costs.
>

FFS! The OP was talking about a private residence - at least he has
not said that this would be powering anything more than a private
residence - it's quite within the realms of reality and as for costs,
this is relative to 'other solutions' such as having power lines
brought to the property (assuming that it's even possible) or the
logistics in trucking in fuel oil/petrol etc.



Posted by Mark Rand on March 30, 2008, 1:22 pm
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>
>
><snip useful but largely irrelevant talk about commercial (24/7) power
>generation>
>>
>>
>> In short... nice thought, shame about the costs.
>>
>
>FFS! The OP was talking about a private residence - at least he has
>not said that this would be powering anything more than a private
>residence - it's quite within the realms of reality and as for costs,
>this is relative to 'other solutions' such as having power lines
>brought to the property (assuming that it's even possible) or the
>logistics in trucking in fuel oil/petrol etc.
>

He also mentioned 8kW.

If you run a lot of superheat, a triple expansion engine, condenser, reheating
and feedwater heating, you may get 15% net efficiency before things get old
and start to degrade (based on my experience with power station performance
tests, this is of the order of days, not years). You might get more by running
a turbine into the condenser in addition to the reciprocating engine.

This means that you are thinking about 40-50kW of boiler capacity. That's
going to need to burn 200kg of hardwood per day.

Of course, if the 8kW is peak load and the average load is significantly
lower, then the costs and additional losses inherent in an inverter and
batteries could make sense to allow a smaller plant, run at its design load
rather than a large one turned down to the point of negligible efficiency.

It's achievable. I'm not sure that it's economic compared to wood for heating
and wind/photovoltaic for electronics and lighting. Could have the heating
plant capable of generating steam at sufficient pressure to run an engine for
the workshop lineshaft. Manual stoking would be less of an issue for that use.


These thoughts are worth almost as much as they cost :-)


Mark Rand
RTFM

Posted by Roland Craven on March 30, 2008, 2:31 pm
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> wrote:
>
> This means that you are thinking about 40-50kW of boiler capacity. That's
> going to need to burn 200kg of hardwood per day.

But if you are going to cut, stack, and then feed 200kg of wood a day you
probably won't need heating :-) and I hope there are good Osteopaths in
Hungary.....

ttfn
--
Roland Craven
Nr. Exeter, Devon, UK
roland@petternut.co.uk
www.petternut.co.uk



Posted by ticktock on March 30, 2008, 2:52 pm
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>
>
> <snip useful but largely irrelevant talk about commercial (24/7) power
> generation>

... I won't bother snipping this crap comment above from someone who
obviously can't read a response which had NOTHING to do with
commercial (24/7)power generation

>
> > In short... nice thought, shame about the costs.
>
> FFS! The OP was talking about a private residence -



Yes.. I quite agree with you on that one.... .... FFS !

I repeat my summation "Nice thought shame about the costs"... if this
is a wood burning steam producer then it is by definition already
outwith the 'normal' costs of a domestic situation.

So, what's your problem? (And no, I'm not really interested in the
'what' .. it's a rhetorical question as you've reached my boredom
threshold.)

Ian

Posted by :Jerry: on March 30, 2008, 3:22 pm
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>>
>>
>> <snip useful but largely irrelevant talk about commercial (24/7)
>> power
>> generation>
>
> ... I won't bother snipping this crap comment above from someone who
> obviously can't read a response which had NOTHING to do with
> commercial (24/7)power generation

So why the comment about 150Kw units when it's been stated that it
needs to be mo larger than a 8Kw?...


>
>>
>> > In short... nice thought, shame about the costs.
>>
>> FFS! The OP was talking about a private residence -
>
>
>
> Yes.. I quite agree with you on that one.... .... FFS !

But you talk about 150Kw, what sort of private residence are you
thinking of FFS?!

>
> I repeat my summation "Nice thought shame about the costs"... if
> this
> is a wood burning steam producer then it is by definition already
> outwith the 'normal' costs of a domestic situation.
>
> So, what's your problem? (And no, I'm not really interested in the

It's not a "shame about the costs" if the alternate costs will be one
hell of a lot more, what do *you* not understand about that?

> 'what' .. it's a rhetorical question as you've reached my boredom
> threshold.)
>

Trolls never do like answers...



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