Re: multi-zone central heating

[Ake Hedman <akhe@xxxxxxxxxxxxx>]

This is very interesting to here. Controlling the heat system to make it=20
more comfortable and economic is one my biggest interest as it comes to=20
SOHO control  Mostly because a colleague to me that does research in the=20
area say it is impossible to build an adaptive self contaned  system for=20
this type of control situations without getting big oscillations. It=20
must be possible IMHO.  As soon as the infrastructure for VSCP is in=20
place I will try this out.

I think one should look at the change in temperature instead of just=20
dumb set-points with some hysteresis and close the valve when you=20
predict that the set-temp should be reached. In the ideal situation this=20
should be simple. But a room have windows that receiveheat  radiation=20
and there are different weather conditions outside and its here the=20
adaptive control comes in. My though is to try to learn from the=20
parameters at hand and adjust the algorithm for these.

Parameters to take into account:

- Temp from furnace out into the system.
- Temp outside.
- Wind conditions.
- Temperature in room and adjacent rooms.

Here at the office I work in a 12 meters by 10 meters room which have a=20
two long radiators on the 12 meter wall (five meters each). They are=20
controller by a standard thermostat but we also have a temperature that=20
goes off by several degrees.  Its not very comfortable.

Commercial: (grin)

If other people on the list is interesting in this and hardware near=20
SECO sensor/control and home automation  please join us in the VSCP=20
project. There are a lot of fun things to do and many funny open=20
hardware/software gadgets will result from the project. There is a low=20
volume mailing list at sourceforge at=20
http://lists.sourceforge.net/lists/listinfo/can-vscp
and I urge anyone=20
interested to join it and lend there brains to the project. Some tasks=20
for people who wants to get there hands dirty is at=20=20
http://sourceforge.net/pm/?group_id=3D53560
  It's a lot of fun I=20
promise.... ;-)



/Ake


Kevin Hawkins wrote:

> Because when I open my current zone valves the inrush of hot water
heats
> my cast iron radiators up and they retain too much heat - causing a=20
> significant overshoot in the room temperature. so my room temp is
> oscillating quite wildly - by some 4 degrees. ( I guess in your
analogy
> the capacitor value is too large and the voltage applied too high ).  
I
> am also considering getting a better flow temperatue control but that
is
> problematic too. Although  I do have boiler modulation control I have
> some (cold) rooms that can generate a demand for heat from time - and
> they need a high flow temp to warm them up quickly.    I sure Smart
> Kontrols would sort it for =A325K   ;-)
>
> Ake Hedman wrote:
>
> >Kevin,
> >
> >but why do you need linear control. Isn't it enough with
open/close and
> >control room temp. using the derivate of the actual temperature.
If you
> >think of the radiator as capacitor this will work much the same as
PWM
> >in electronics and give "sort of" the same result energy
wise.
> >
> >/Ake
> >
> >=20
> >
>
>
>
>
>
>
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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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