[EnergyPlus_Support] Re: Combination of the OA unit system and Fancoil unit system

["hbn_pch" <hbn_pch@xxxxxxxxxxxx>]

Dear,
   Cry!
   According to above two issues,i test more and more time.I tried to 
change the priority of the OA unit and FanCoil unit.But i found the 
fancoil did't work yet.It also appeared that the design coil load is 
zero for cooling coil and heating coil in the zone fancoil unit.
  Now i really don't know how to fix the problem.

  Waiting your kind help.thanks very very much.
  pch

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "hbn_pch" <hbn_pch@y...> 
wrote:
>
> Hi,
>    I'm sorry that i had another doubt.If all element are 
autosized,it 
> seems that the oa unit always trid to meet the load because of its 
> high priority for heating and cooling.And then all of the fancoil 
> unit will not work at all.Is it right?But the real anticipant 
result 
> is : oa unit tried to meet load first,and if it could't produced 
> adequate energy,then fancoil will try to meet excess load.How to 
> realize above controlld operation??
> 
>   Thanks very much! appreciated your kind help.
> 
>   pch
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "hbn_pch" <hbn_pch@y...> 
> wrote:
> >
> > Dear sir,
> >    I created a 3-zone model.Each zone has own fancoil unit to 
serve 
> > and there is a indepent outside air unit to serve the three 
> > zones.Fancoil units specifies no outside air(maximum outside air 
> rate 
> > set to 0),and their cooling source is a chiller,heating source is 
> > purchased heating.
> > The OA unit used another purchased cooling and purchased heating 
as 
> > its cooling&heating source. The OA unit had high priority.
> > 
> >   After simulation,there are some warnings and severes as follows:
> > 
> >    ** Warning ** The design coil load is zero for 
> COIL:Water:Cooling 
> > RESISTIVE ZONE_FANCOILCOOLINGCOIL
> >    **   ~~~   ** The autosize value for max water flow rate is 
zero
> >    ** Warning ** The design coil load is zero for 
> COIL:Water:Cooling 
> > EAST ZONE_FANCOILCOOLINGCOIL
> >    **   ~~~   ** The autosize value for max water flow rate is 
zero
> >    ** Warning ** The design coil load is zero for 
> COIL:Water:Cooling 
> > NORTH ZONE_FANCOILCOOLINGCOIL
> >    **   ~~~   ** The autosize value for max water flow rate is 
zero
> >    ** Warning ** Check input. Pump nominal power or motor 
> efficiency 
> > is set to 0, for pump=CW PUMP
> >    ** Warning ** Check input. Pump nominal volumetric flow rate 
is 
> > set or calculated = 0, for pump=CW PUMP
> >    ** Warning ** Check input. Pump nominal power or motor 
> efficiency 
> > is set to 0, for pump=OA HW PUMP
> >    ** Warning ** Check input. Pump nominal volumetric flow rate 
is 
> > set or calculated = 0, for pump=OA HW PUMP
> >    ** Warning ** Check input. Pump nominal power or motor 
> efficiency 
> > is set to 0, for pump=COND PUMP
> >    ** Warning ** Check input. Pump nominal volumetric flow rate 
is 
> > set or calculated = 0, for pump=COND PUMP
> >    ** Severe  ** COOLING TOWER:SINGLE SPEED "CENTRAL COOLING 
> TOWER". 
> > Free convection air flow rate must be less than the design air 
flow 
> > rate.
> >    ** Severe  ** COOLING TOWER:SINGLE SPEED "CENTRAL COOLING 
> TOWER". 
> > Free convection UA must be less than the design tower UA.
> > 
> >   It seems that the oa unit has produced adequate energy and the 
> > fancoil units did't need to work(Is it right???).But there is a 
> > problem for the OA HW Pump,it did't work at all.The cooling tower 
> > did't work yet.Why???? 
> > 
> >   In ordoer to urge the oa unit and fancoil unit working 
together,i 
> > tried to reduce the zone sizing temp from 14 to 4.And two units 
> work 
> > together as anticipant.Only leaving warnings of the OA HW 
Pump.But 
> > changing the zone sizing temp to 4 is illogical,then what can i 
> do???
> > 
> >   All of values are autosized.Can i specify the load produced by 
oa 
> > unit(eg.specify maximum air flow rate of the direct air unit),and 
> > auotsize the fancoil unit to decide their on/off????
> > 
> >   I don't know whether the combination of the two unit system is 
> > correct.I hope somebody can help me.Thanks very much.
> >   I've upload the file(pch.idf) to file area.
> > 
> >   Thanks again.
> >   pch
> >
>






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