Re: [EnergyPlus_Support] zero air loop mass flow rate

[Sebastian Dietz <sebastian.dietz@xxxxxxxxxxxxxxxxx>]

Hello Mike,

thanks a lot for your help. I chanced all air flow rates to the same 
value. But I get only an air flow, if I set a minimal air flow rate for 
the fan. Why doesn't variate the air flow to meet the zone load? I'm 
sorry, if this is a basic question.

thanks in advance
sebastian



Michael J. Witte schrieb:
> In the BRANCH object "Branch_Air_supply_in", the maximum flow rate is set to 
> zero.  (Version 2.0 does generate a warning message for this condition - one of 
> many reasons to upgrade!)  
>
> Program Version,EnergyPlus 2.0.0.025, 4/13/2007 9:29 AM,IDD_Version 2.0.0.025
>    ** Severe  ** Branch=BRANCH_AIR_SUPPLY_IN is an air branch with zero max 
> flow rate.
>
>
> When specifying hard values for sizes (instead of autosize), the maximum (or 
> design) flow rate in the AIR PRIMARY LOOP, BRANCH, FAN, and other components on 
> the air loop main branch must all have the same value.  And the sum of the 
> terminal unit design flow rates must equal the main air loop flow rate.
>
> Mike
>
>
> On 13 Apr 2007 at 15:58, Sebastian Dietz wrote:
>
>   
>> Hello erverybody,
>>
>> I'm simulating one zone modell to get familíar with Energy Plus. 
>> Therefor I constructed an simple Air Loop. The primary air system side 
>> contains Fan and coil:water:simple:heating elements, the zone equipment 
>> side contains a singleduct:vav:noreheat element. I compared my file 
>> serveral times with example files, but I have still no mass flow rate in 
>> the Air Loop. I don't get any warnings, thus it seems to be a set point 
>> or controller fault. Does anybody have an idea, how to solve the problem?
>> I added my simpleairloop.idf file to the web
>>
>> Thanks in davance
>> sebastian
>>
>> -- 
>> Sebastian Dietz
>> Fraunhofer-Institut for Solare Energiesysteme ISE
>> Heidenhofstrasse 2, 79110 Freiburg, Germany
>> Phone: +49 (0) 7 61/ 45 88-51 36
>> Sebastian.Dietz@xxxxxxxxxxxxxxxxx
>> http://www.ise.fraunhofer.de
>> -------------------------------------------
>>
>>
>>
>> The primary EnergyPlus web site is found at:
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>>
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>> http://groups.yahoo.com/group/EnergyPlus_Support/
>>
>> Attachments are not allowed -- please post any files to the appropriate folder
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>>
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>> Documentation link and press the "search" button.
>>
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>>
>>
>>
>>
>>
>>     
>
>
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support      
> EnergyPlus-Support@xxxxxxxx
>
>
>
>
>   


-- 
Sebastian Dietz
Fraunhofer-Institut for Solare Energiesysteme ISE
Heidenhofstrasse 2, 79110 Freiburg, Germany
Phone: +49 (0) 7 61/ 45 88-51 36
Sebastian.Dietz@xxxxxxxxxxxxxxxxx
http://www.ise.fraunhofer.de
-------------------------------------------



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