Re: multi-zone central heating

[Ake Hedman <akhe@xxxxxxxxxxxxx>]

Kevin,

So you have tested it. Great. I still like to see the radiator as an=20
analogy of a capacitor and the flow is just energy that I put in and the=20
radiation going out in the room is the leakage. In that way you in a=20
sense get a "constant" temperature if you like or more
importantly can=20
get a constant temperature in the room.

- How large oscillations did you get with the calculated approach?

- Could you notice a variation in beahiviour with outside temp/wind?

- How did an open window disturb the algorithm?

>PS Any news on VSCP / xAP ??

This is definitely on the list. Some sort of BSC mapping would be nice.=20
We are all working with t the lower levels now but this is something=20
that has to be done soon. I think this is typically is something for you=20
to do Kevin? ;-)

Some guys in the group are working on a CD/CF/USB bootable Linux=20
distribution with Home Automation stuff on it and there XAP would be=20
nice to support to.

/Ake


Kevin Hawkins wrote:

> Ake Hedman wrote:
>
> >This is very interesting to here. Controlling the heat system to
make it
> >more comfortable and economic is one my biggest interest as it
comes to
> >SOHO control  Mostly because a colleague to me that does research
in the
> >area say it is impossible to build an adaptive self contaned 
system for
> >this type of control situations without getting big oscillations.
It
> >must be possible IMHO.  As soon as the infrastructure for VSCP is
in
> >place I will try this out.
> >
> >I think one should look at the change in temperature instead of
just
> >dumb set-points with some hysteresis and close the valve when you
> >predict that the set-temp should be reached.
> >
> I have actually tried this Ake . What I have found though is that the
> radiator heats very quickly. Maybe my flow temp is too high or the
flow
> rate too fast but if I open the valve for even just a few seconds then
> the radiator achieves a really hot temperature and it takes some
> considerable while to dissipate this, causing the oscillations and the
> hysteresis.   So instead of waiting for a temp to be satisfied I
> calculated how long I expected it would take for it to be reached and
> played with different valve 'open' times to just achieve this (without
> an overshoot), it certainly is better in that you are not removing the
> feed to the heat source (which still has stored capacity) at the point
> that  it has already reached temperature.  But I feel the right way is
> to be able to set the radiator to a constant temperature that is in
> 'balance' with heat from the circulating water and the heat it
> dissipates to keep the room at a steady temperature.. hence you would
> have warm radiators at a  semi constant temp.  I think the best way to
> do this is with some form of proportional valve or similar - and
playing
> with the 'feedback' system will be reasonably fun I think. So I was
> looking for a DIY approach - at least to play - before I get so
> frustrated that I call SK in , which I might consider anyway on a
> smaller '2 room only' approach if thats possible.
>
> PS Any news on VSCP / xAP ??
>
> K
>
>
>
>
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--=20
---
Ake Hedman (YAP - Yet Another Programmer)
eurosource, Brattbergav=E4gen 17, 820 50 LOS, Sweden
Phone: (46) 657 413430 Cellular: (46) 73 84 84 102
Company home: http://www.eurosource.se=20=20=20=20=20=20
Kryddor/Te/Kaffe: http://www.brattberg.com
Personal homepage: http://www.eurosource.se/akhe
Automated home: http://www.vscp.org



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