[EnergyPlus_Support] Re: humidity control

["hbn_pch" <hbn_pch@xxxxxxxxxxxx>]

Mike,i report the system node temp and system node volflowrate,find 
that system node temp is low enough(perhaps had achieved dew point) 
but system node volflowrate remain max(sizing in eio).It seems that 
the air loop capability is sized too small.Then i adjust the sizing 
parameter to 2 and find it can control temp and hum well.I try 
another model for a test,find it should set sizing parameter to 3 for 
control aim.All is autosized in the model.Why is it sized so small?
Does it just sized the sensible load?But when i change the size type 
in system sizing to total,the result did not change yet.

question 2 :I set 0.0094m3/s in the zone sizing for outside air and 
oa method is flow/person.There is 20 people in the zone,min oa remain 
1.So for all day,the outside air volflowrate should remain 
0.188m3/s.But for simulation ,i find sometimes the outside air 
volflowrate would increase.What caused this change?

question 3 :When i use vav:reheat,i set the vav outlet node temp in 
winter to 16.I find in winter design day,the vav damper remain min 
and the vav outlet node temp did not achieve setpoint temp.I checked 
other simulation day,find that the vav outlet node temp did't not 
achieved setpoint at all,sometimes are very small.Then it will be 
reheated by reheat coil .How did the main heating coil and reheat 
coil distribue the heating task?

  Appreciated your kind help.
  PCH


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "mjwitte" <mjwitte@...> 
wrote:
>
> If you report the System Node Setpoint Temp at the air loop outlet
> node, you will see that the controller is trying to control to the
> specified RH setpoint, but the cooling coil is unable to supply air
> that is cold enough to meet this.  I tried making some changes to 
get
> this to autosize to a better result, but have not been successful 
yet.
> 
> Mike
> 
> 
> 
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "hbn_pch" <hbn_pch@> 
wrote:
> >
> > Dear,
> >    I want to control humidity for a single zone.I create the 
model like 
> > the examplefile '5ZoneWaterCooled_HighRHControl.idf',but the Zone 
Air 
> > Relative Humidit was not controlled to setpoint in my model,while 
the 
> > examplefile can.
> >    I really can't find the problems.appreciated your kind 
help.I've 
> > upload  correlative file named 'RH CONTROL.zip'
> >    Thanks very much
> >    pch
> >
>






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