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Re: [EnergyPlus_Support] Re: Solar collectors: "Branches cannot handle all the flow"





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@xxxxxxxxx> wrote:

From: davylagre <davylagre@xxxxxxxxx>
Subject: [EnergyPlus_Support] Re: Solar collectors: "Branches cannot handle all the flow"
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
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
>
>
>
>
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>
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>
>
>
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> 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?
>




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