Parameter setting TEM Paradigma Ökofen

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dirk pitt
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by dirk pitt » 25/03/09, 11:47

too bad for the off-topic,
I still find it strange that it does not apply the hydraulic diagrams recommended by the manufacturer of the balloon!

already first point if I follow your diagram:
the rule in an exchanger is to make the water arrive at the bottom if it is a drawing of heat and at the top if it is a contribution of heat (but perhaps you are wrong in the representation of the exchangers)

in your case, the rotex is used more as a heating buffer tank than as a solar tank. With the radiator return that goes to the bottom of the balloon, I'm afraid that your solar collectors are useless because the times when the water temperature of the solar collectors will be higher than the temperature at the bottom of the balloon heated by the radiator return, these moments will be rare.
a swimming pool return (for which this exchanger is provided) is colder than a radiator return which, let us remember, is mixed by the V3V with the starting water.
the bottom of the balloon must remain a zone cold enough so that the weak solar gain is useful for something. it is not for nothing that solaris has provided that the radiator return is made in the central tube. (not used in your diagram)
In your case, even the bottom of the balloon will be hotter than what comes from the solar collectors which will therefore be useless. stratification will be almost non-existent.

my other fear with two separate circuits is the lack of reactivity during variations in demand from the radiator circuit. for example when at the end of the night in reduced mode, the 3-way radiator valve will ask for more hot water from a tank that has already been cooled down quite a bit. the rise in temperature may be very long.

the killer question to ask your heating engineer is: where have you already installed a similar circuit? if this is the first time he's done it, stick to the manufacturer's hydraulic diagram. if, on the other hand, it is the 10th that it rises in this way by what he has observed with customers such and such an advantage (verifiable with customers) why not. I don't claim to have infallible science.
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manet42
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by manet42 » 25/03/09, 13:18

In the diagram, the heat is supplied by the shortest exchanger, 2/3 high, and the drawing by the deepest collector.
That said, I completely agree with your logical remarks (in particular the lack of responsiveness and the risk of heating the bottom balloon by the radiator return).
This is the reason why I have expressed reservations.
For the killer question, I'm going to ask the technician behind the diagram.
I intend to make a usage report on this forum, possible title: "A non-academic pellet / solar system with its setbacks (or its successes ..)
To follow then.
Thank you again for your advice, it may not be over ...

JC
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dirk pitt
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by dirk pitt » 25/03/09, 14:30

manet42 wrote:In the diagram, the heat is supplied by the shortest exchanger, 2/3 high, and the drawing by the deepest collector.


I misspoke, I wanted to say that on your diagram, for the intake exchanger, we see the hot inlet pipe going directly to the bottom of the exchanger and going up in a zig-zag, and vice versa on the drawing off exchanger whereas it is the opposite but it was a detail.

keep us in touch
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by manet42 » 06/04/09, 09:34

Hello,
For a few days, the installation has been running. Thanks to these forums, I start to tame the beast (T. limit comfort 18 ° C, T. limit REDUCED + 13 ° C). I had noted the data of my old boiler (starting T at 15 ° C: 28 ° C, slope 0,66). What I took for the Okofen: fixed point 30 °, slope 0,7.
It works, except that the ambient temperature varies between 20,2 and 18,8, normal closing of the valve at 20 and reopening at 19. A cool evening: little feeling of discomfort.
In the past, I manually set the starting temperature so that my old room sensor hardly intervenes. I will therefore "fine-tune" my instructions: compensation, fixed point, slope to try to obtain the same result.
On the other hand, I do not understand what the set point hysteresis is used for (p14) except to increase the oscillation of the ambient T. (closing at T + hysteresis and opening at T-1 ° C), which is not not very good. At home, it's 0 ° C.

It will remain to adjust the protected parameters with the technician who returns on April 21.

This is the second installation he is carrying out, the stratification is for example 76 ° C accum. Rotex, 47 ° C low Rotex. To be continued.

Kind regards.

JC
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