[TRNSYS-users] TRNSYS-users Digest, Vol 119, Issue 32

Thu Nov 27 14:28:17 PST 2014

Dear Michael Stochniol,
Thank you for your question. I am having the same problem. Have you also
noticed that your pump starts from the peak?
 If you can use any solar collector, you can try Type 539 solar collector
which calculated mass flow-rate on its own. I know that worked for my
friend.
Dear Sunliang Cao will you please elaborate on using tempering valve for
this application.

Thanks
Bridjesh

On Thu, Nov 27, 2014 at 10:20 PM, <
trnsys-users-request at lists.onebuilding.org> wrote:

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> Today's Topics:
>
>    1. type22 stability/solarloop (Michael Stochniol)
>    2. Re: type22 stability/solarloop (SUNLIANG CAO)
>    3. Type 15-7 (Stefan Hampel)
>
>
> ---------- Forwarded message ----------
> From: Michael Stochniol <stochnio at mail.hs-ulm.de>
> To: "trnsys-users at lists.onebuilding.org" <
> trnsys-users at lists.onebuilding.org>
> Cc:
> Date: Thu, 27 Nov 2014 09:24:52 +0100
> Subject: [TRNSYS-users] type22 stability/solarloop
> Hello to all,
>
> first thanks for the great answers to my last question, it really helped!
>
> i am creating a SDHW -system. In order to do that i combined a variable
> speed pump with type22 to adjust the massflow trough the pump to reach a
> certain Tset tempreture from my collector.
> My Type 22 has 1 as maximum output and 0.45 as minimum. everything else is
> on default. The set tempreture is 77 °C and the controlled Variable is the
> output tempreture of the flat plate collector.
> Also the type 22 is combined with a differantial controller for his on/off
> function.
>
> it seems that the controller has problems to find a signal inbetween min
> and max. most of the time it is just switching between them both. Somtimes
> very frequently. I tried alot to change this behavior experimenting with
> all the parameter in type 22 but without luck. I alsp tryed to store the
> controlled variable input for one timestep, or even for the output.  But
> nothing seems to improve the stability. the listfile tells me that the
> controller was stuck for 2,5% of the last simulation. Is that bad? Or
> normal?
>
> I am using 1 minute time steps.  There are pipes in the loop with enough
> capacity.
>
> Do someone have maybe a advise how to improve stability for the solarloop
> controll anyhow?
>
> Im no experienced user, bascily everything i do is try and error.
>
> thanks in advance
>
> Michael Stochniol
>
>
>
>
>
>
>
> ---------- Forwarded message ----------
> From: SUNLIANG CAO <caosunliang at msn.com>
> To: "TRNSYS users mailing list at OneBuilding.org" <
> trnsys-users at lists.onebuilding.org>, "stochnio at mail.hs-ulm.de" <
> stochnio at mail.hs-ulm.de>
> Cc:
> Date: Thu, 27 Nov 2014 08:52:07 +0000
> Subject: Re: [TRNSYS-users] type22 stability/solarloop
>
> Dear Michael,
>
> Try the following solutions and advice:
> 1, Set the input 7 of type22 "Tolerance of tracking error" to for example
> 0.001 instead of 0
> 2, Set the 2nd parameter of Type 22 "Max number of oscillations" to for
> example 50 instead of 0
>
> Sometimes, when the flow rate in the solar water loop is too low, Type 22
> will be very difficult to converge. So also adjust the flow rate to avoid
> the low flow rate.
>
>
> If all the above solutions fail, then maybe you can consider adjusting the
> configuration of your system in TRNSYS simulation and add a tempering
> valve+mixer to control the outlet temperature of the mixer instead of the
> outlet temperature of the solar collector. The algorithm of tempering valve
> Type 11b takes both the heat source temperature and the set-point
> temperature into account, which will converge better than Type 22.
>
> Hope it helps.
>
>
> Kind Regards,
> Sunliang Cao
>
>
> > From: stochnio at mail.hs-ulm.de
> > To: trnsys-users at lists.onebuilding.org
> > Date: Thu, 27 Nov 2014 09:24:52 +0100
> > Subject: [TRNSYS-users] type22 stability/solarloop
> >
> > Hello to all,
> >
> > first thanks for the great answers to my last question, it really helped!
> >
> > i am creating a SDHW -system. In order to do that i combined a variable
> speed pump with type22 to adjust the massflow trough the pump to reach a
> certain Tset tempreture from my collector.
> > My Type 22 has 1 as maximum output and 0.45 as minimum. everything else
> is on default. The set tempreture is 77 °C and the controlled Variable is
> the output tempreture of the flat plate collector.
> > Also the type 22 is combined with a differantial controller for his
> on/off function.
> >
> > it seems that the controller has problems to find a signal inbetween min
> and max. most of the time it is just switching between them both. Somtimes
> very frequently. I tried alot to change this behavior experimenting with
> all the parameter in type 22 but without luck. I alsp tryed to store the
> controlled variable input for one timestep, or even for the output. But
> nothing seems to improve the stability. the listfile tells me that the
> controller was stuck for 2,5% of the last simulation. Is that bad? Or
> normal?
> >
> > I am using 1 minute time steps. There are pipes in the loop with enough
> capacity.
> >
> > Do someone have maybe a advise how to improve stability for the
> solarloop controll anyhow?
> >
> > Im no experienced user, bascily everything i do is try and error.
> >
> > thanks in advance
> >
> > Michael Stochniol
> >
> >
> >
> >
> > _______________________________________________
> > TRNSYS-users mailing list
> > TRNSYS-users at lists.onebuilding.org
> > http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
>
>
> ---------- Forwarded message ----------
> From: Stefan Hampel <s13d39 at umwelt-campus.de>
> To: "TRNSYS users mailing list at OneBuilding.org" <
> trnsys-users at lists.onebuilding.org>
> Cc:
> Date: Thu, 27 Nov 2014 14:03:23 +0000
> Subject: [TRNSYS-users] Type 15-7
>  Hey,
> i try to build up a PV- Simulation with German weatherdata given in TRY
> format. Therefore i use the Type 15-7 .But always when i run a simulation
> it says" Unable to correctly read from the supplied data file - please
> check the file and re-run the simulation"in the list-file. I tried a few
> thinks,but i cant get it to work.
> Any suggestions?
>
> Thanks
>
>
> Stefan
>  <http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org>
>
>
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>

-- 
bridjesh
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