[TRNSYS-users] TRNSYS-users Digest, Vol 119, Issue 30

[bridjesh gautam]

Thank you MR. Heymer and Thronton
I connected control function directly to Type 46 and worked well but I do
have one more question.
I am controlling Type 110 pump with Type 22 controller and have noticed
pump always starts with a peak of rated volume flow. My pump has minimum
flow ,25% of rated mass flow and setting minimum control function to 0.25
or even 0 does not help.
I tried changing Threshold for non-zero output and Maximum number of
oscillations to various value still having no luck.
I read that pump does not model on-off condition does that mean running
simulation with very small time steps(>1 min) will have bigger impact on
overall result ? What can be done so pump does not always start at the
peak?


Thank you in advance


On Wed, Nov 26, 2014 at 10:16 PM, <
trnsys-users-request at lists.onebuilding.org> wrote:

> Send TRNSYS-users mailing list submissions to
>         trnsys-users at lists.onebuilding.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
>
> http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
>
> or, via email, send a message with subject or body 'help' to
>         trnsys-users-request at lists.onebuilding.org
>
> You can reach the person managing the list at
>         trnsys-users-owner at lists.onebuilding.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of TRNSYS-users digest..."
>
> Today's Topics:
>
>    1. Re: On off time calculator type 980 (Jeff Thornton)
>
>
> ---------- Forwarded message ----------
> From: Jeff Thornton <thornton at tess-inc.com>
> To: "TRNSYS users mailing list at OneBuilding.org" <
> trnsys-users at lists.onebuilding.org>
> Cc: "TRNSYS users mailing list at OneBuilding.org" <
> trnsys-users at lists.onebuilding.org>
> Date: Wed, 26 Nov 2014 09:22:35 -0600
> Subject: Re: [TRNSYS-users] On off time calculator type 980
> Type 24 already accounts for the time step. As Ben suggests, simply
> connect the same control signal that you use to drive the pump to an
> integrator as well.
>
> Jeff Thornton
> TESS
>
> Sent from my iPhone
>
> > On Nov 26, 2014, at 8:31 AM, Ben Heymer <bheymer at gmail.com> wrote:
> >
> > You could integrate the control signal to the pump (should be 0 to 1)
> > or build your own simple counter using an equation and an integrator,
> > such as type 24, based on some output value from the pump. For
> > example:
> >
> > gt(pump_flow_rate,0) * timestep --> integrator
> >
> > Type 24 may already account for the time step, you will have to check.
> >
> > Cheers,
> > Ben Heymer, PE
> >
> > On Wed, Nov 26, 2014 at 4:07 AM, bridjesh gautam
> > <bridjeshgautam at gmail.com> wrote:
> >> Dear. Trnsys users
> >> I need to find out how many hours my pump was on in the simulation. I
> found
> >> type 980 can give me the current running on and off time but not the
> total
> >> ,as it starts from zero next time it is on or off. Is there any other
> way to
> >> find that out ?
> >>
> >> Thank you
> >>
> >>
> >> _______________________________________________
> >> TRNSYS-users mailing list
> >> TRNSYS-users at lists.onebuilding.org
> >> http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
> >>
> > _______________________________________________
> > TRNSYS-users mailing list
> > TRNSYS-users at lists.onebuilding.org
> > http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at lists.onebuilding.org
> http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
>
>


-- 
bridjesh
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/attachments/20141126/3703b6b3/attachment-0004.htm>