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Re: [EnergyPlus_Support] HVAC parallel system


A word of caution. Loops in e+ have some limitations and rules. For example, a heating plant can only have one pump on the supply side. special objects exist, like the headered pump, to overcome some of these limitations. I haven't checked for some time, but I expect that only one generic fan is allowed on the airloop supply side, with some exceptions, such as an exhaust fan on the inlet of the main branch. there are also duel deck systems...so what I'm saying is there is usually a way or at least a workaround, but it can get tricky.


2014-04-15 19:52 GMT+02:00 Daniel Liu <<mailto:danielliu3638@xxxxxxxxx>danielliu3638@xxxxxxxxx>:
>  
> Thanks Jim! I already build the model for that system but somehow the error pops up before the actual running. I guess I need to check my connections. What i did was use the spliter for the supply inlet and split it into two path in to go through different AHUs, and then use a mixer to combine the outlet from the AHUs. But somehow the eneryplus dont like it.  Any more suggestions? Thanks  
 On Tuesday, April 15, 2014 10:56 AM, Jim Dirkes <<mailto:jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>  
Daniel,
EnergyPlus can certainly model this configuration, but may require some minor adaptations that will not affect the calculation results.
How you do it is another matter!  I recommend some study of EnergyPlus and one of the available graphical interfaces, like DesignBuilder, or OpenStudio. Preparing an energy model is not yet a simple activity and requires a fair amount of study and practice.
  
James V Dirkes II, PE, BEMP, LEED AP
> <http://www.buildingperformanceteam.com/>> www.buildingperformanceteam.com
> Energy Analysis, Commissioning & Training Services
> 1631 Acacia Drive, Grand Rapids, MI 49504 USA
> <tel:616%20450%208653>> 616 450 8653
  
From: <mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Daniel Liu
> Sent: Tuesday, April 15, 2014 11:28 AM
> To: <mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] HVAC parallel system
  
 
To whom it may concern,
Recently I am doing a project to simulate the energy consumption and control for a university building. The existing AHU systems are in parallel. They have 10 AHU units, but each 2 of them are a pair in parallel.  One outside air system and air misxing box serves two AHU. I am wondering if energyplus could model this system. If so, how could it be done. 
Thanks 
Daniel 
> 
> 




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