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Re: [EnergyPlus_Support] Re: Zone will not reach setpoint
Change your "Central heating design supply air temperature (C)" to match
what is entering the zone terminal unit heating coil. In this case it is
12.78 C. The zone now maintains 18-20C.
SYSTEM SIZING,
AirLoop_AH1, !- name of an AIR PRIMARY LOOP object
sensible, !- type of load to size on
Autosize, !- Design (minimum) outside air volumetric
flow rate {m3/s}
1, !- minimum system air flow ratio
4.44, !- Preheat design temperature {C}
0, !- Preheat design humidity ratio
{kg-H2O/kg-air}
12.78, !- Precool design temperature {C}
0.0087, !- Precool design humidity ratio
{kg-H2O/kg-air}
12.78, !- Central cooling design supply air
temperature {C}
12.78, !- Central heating design supply air
temperature {C} <--------
coincident, !- Sizing Option
no, !- Cooling 100% Outside Air
no, !- Heating 100% Outside Air
0.0087, !- Central cooling design supply air
humidity ratio {kg-H2O/kg-air}
0, !- Central heating design supply air
humidity ratio {kg-H2O/kg-air}
design day, !- cooling design air flow method
, !- cooling design air flow rate {m3/s}
design day, !- heating design air flow method
; !- heating design air flow rate {m3/s}
JV Dirkes II wrote:
>
> Dear E+ Forum,
>
> I've tried using V2.2.026, since that version addresses a known reheat
> problem, but the model still reflects the problems noted in my last post.
>
> Can anyone help?
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> <mailto:EnergyPlus_Support%40yahoogroups.com>, "JV Dirkes II" <jvd2pe@...>
> wrote:
> >
> > Dear E+ Forum,
> >
> > I am still hoping for some help with this problem. I've added report
> > variables, tried different settings, double and triple checked all th
> > input, and still cannot get the zone to warm up.
> >
> > Thanks in advance.
> >
> > p.s., The uploaded file is called "ZoneTooCold.zip"
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> <mailto:EnergyPlus_Support%40yahoogroups.com>, "JV Dirkes II" <jvd2pe@>
> > wrote:
> > >
> > > Dear E+ Forum,
> > >
> > > My current model includes a variable volume air handler and VAV boxes
> > > with reheat coils. The zone which represent 90% of the building never
> > > reaches its setpoint on the Winter Design Day.
> > >
> > > Per report variables, the air handler has proper temperature heating
> > > hot water (82C) and the discharge temperature is at the expected
> > > setpoint (12.9C). Air flow is autosized.
> > >
> > > The zone reheat coil is also autosized and has the same heating hot
> > > water temperature as the air handler. Per report variables, the
> > > reheat coil has water flow and is using energy, but only heats the
> > > zone to 5C instead of the setpoint (21.1C).
> > >
> > > I've tried manually sizing the reheat coils much larger than the load,
> > > but they continue to use only a small fraction of their capacity and
> > > the zone stays too cold. Please let me know what might prevent the
> > > reheat coils from warming the zone properly. Thanks!
> > >
> > > p.s., I've uploaded the file in case it will be helpful.
> > >
> >
>
>
--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL 32922-5703
Phone: (321) 638-1454
Fax: (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu
UCF - From Promise to Prominence: Celebrating 40 Years
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