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Re: [EnergyPlus_Support] Re: Solar collectors: "Branches cannot handle all the flow"
Do you have a bypass pipe for the solar collectors. If not, try adding
one to see what is actually happening. If the pump has more flow than
the solar collectors, the fluid has to go somewhere.
davylagre wrote:
>
>
> Hi,
>
> I've allready tried to put all my branches passive but it still
> doesn't work! I'm really upset!
> If you have any other idea...
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> <mailto:EnergyPlus_Support%40yahoogroups.com>, Abdelali Ait El Cadi
> <abdelali.aitelcadi@...> wrote:
> >
> > hi,
> >
> > i've never worked on solar collectors modelling.
> >
> > i've another alternative for you, if the flow rate value is not so
> important in your model, make all branches passive one to avoid flow
> control.
> >
> > i hope that will work.
> >
> >
> > --- On Thu, 5/28/09, davylagre <davylagre@...> wrote:
> >
> > From: davylagre <davylagre@...>
> > Subject: [EnergyPlus_Support] Re: Solar collectors: "Branches cannot
> handle all the flow"
> > To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> <mailto:EnergyPlus_Support%40yahoogroups.com>
> > Date: Thursday, May 28, 2009, 10:17 AM
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Hello,
> >
> >
> >
> > Thanks for your post! Unfortunately, it doesn't solve my problem! I
> put 0 in maximum flow rate for each branch but the same error still
> occurs!
> >
> > In your case, have you ever work in solar collectors modeling?
> >
> >
> >
> > --- In EnergyPlus_Support@ yahoogroups. com, Abdelali Ait El Cadi
> <abdelali.aitelcadi @...> wrote:
> >
> > >
> >
> > > hello,
> >
> > >
> >
> > > i had the same problem in my hydronic low radiant system, and i
> solve it by putting 0 in maximum flow rate for each branch, because
> this field is required for air loops and not for water loops.
> >
> > >
> >
> > >
> >
> > >
> >
> > > --- On Wed, 5/27/09, davylagre <davylagre@ ..> wrote:
> >
> > >
> >
> > > From: davylagre <davylagre@ ..>
> >
> > > Subject: [EnergyPlus_ Support] Solar collectors: "Branches cannot
> handle all the flow"
> >
> > > To: EnergyPlus_Support@ yahoogroups. com
> >
> > > Date: Wednesday, May 27, 2009, 12:13 PM
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > > I'm trying to model solar collectors (again!). I want to model
> solar collectors as follows:
> >
> > >
> >
> > > oooooooooo
> >
> > >
> >
> > > oooooooooo (o = solar collector)
> >
> > >
> >
> > > oooooooooo
> >
> > >
> >
> > > oooooo
> >
> > >
> >
> > >
> >
> > >
> >
> > > When I model collectors as follows:
> >
> > >
> >
> > > oooooooooo
> >
> > >
> >
> > > o
> >
> > >
> >
> > > o
> >
> > >
> >
> > > o
> >
> > >
> >
> > >
> >
> > >
> >
> > > An error occured :
> >
> > >
> >
> > > ** Severe ** Branches cannot handle all the flow. Possible causes
> could be absence of Bypass,
> >
> > >
> >
> > > ** ~~~ ** or components that are manually sized incorrectly.
> Consider autosize where possible.
> >
> > >
> >
> > > ** ~~~ ** To fix add a Bypass branch or size the other
> ACTIVE/PASSIVE branches to equal the loop flow
> >
> > >
> >
> > > ** ~~~ ** Occurs in Plant Loop=DHW LOOP
> >
> > >
> >
> > > ** ~~~ ** Occurs for Splitter=DEMAND SPLITTER
> >
> > >
> >
> > >
> >
> > >
> >
> > > But, all my components are autosize!! Thus, my installation
> doesn't have any bypass, so I don't want to model bypass!
> >
> > >
> >
> > > Is there anybody able to solve this problem?
> >
> > >
> >
>
>
--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL 32922-5703
Phone: (321) 638-1454
Fax: (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu
UCF - From Promise to Prominence: Celebrating 40 Years
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