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[EnergyPlus_Support] Re: VAV single duct reheat
Mike:
I got it! Thank you very much!
Li
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
<mjwitte@g...> wrote:
> Li:
>
> To simulate a constant capacity and efficiency DX coil, you need
to
> create curve objects for the DX coil performance curve fields:
>
> !- Total Cooling Capacity Modifier Curve (function of temperature)
> !- Total Cooling Capacity Modifier Curve (function of flow
fraction)
> !- Energy Input Ratio Modifier Curve (function of temperature)
> !- Energy Input Ratio Modifier Curve (function of flow fraction)
> !- Part Load Fraction Correlation (function of part load ratio)
>
> For the function of temperature curves, which have two independent
> variables, you need a CURVE:BIQUADRATIC object with coefficients
of
> 1,0,0,0,0,0. You can reference the same curve object more than
once.
>
> For the function of flow fraction curves and the Part Load
Fraction
> curve, which have one independent variable, you need a
> CURVE:QUADRATIC object with coefficients 1,0,0.
>
> Mike
>
>
>
> On 13 Feb 2003, at 22:30, zl21e zl21e@y... wrote:
>
> > Mike,
> > Thank you for your advice. It is very helpful.
> > Since I don't care the details of the the DX coil too, in
> > Coil:DX:CoolingBypassFactorEmpirical, can I set the functions to
be 1
> > from A5 to A9 which are "total cooling capacity modifier curve
> > (temperature)", "total cooling capacity modifier curve(flow
> > fraction)", "energy input ratio modifier curve
(temperature)", "energy
> > input ratio modifier curve(flow fraction)", and "part load factor
> > modifer curve (part load ratio)"? And how can I set the values
to
> > those functions?
> >
> > Thanks again for your help!
> >
> > Li
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
> > <mjwitte@g...> wrote:
> > > Li:
> > >
> > > What you describe is functionally what the
VAVSingleDuctReheat.idf
> > > is. To eliminate the hot water loop, change the reheat coils
to
> > be
> > > electric or gas. To eliminate the chilled water loop, you
would
> > have
> > > to use a DX cooling coil. This would require two objects,
> > > DXSystem:AirLoop and COIL:DX:CoolingBypassFactorEmpirical.
You
> > will
> > > not need the cooling coil controller but you will still need
the
> > set
> > > point manager to specify the setpoint leaving the cooling coil.
> > >
> > > Mike
> > >
> > >
> > >
> > > On 12 Feb 2003, at 21:43, zl21e zl21e@y... wrote:
> > >
> > > > Hello, Everybody,
> > > > I need to simulate a system like this:
> > > > First, the supply air is cooled at 60F, then it is sent to
> > several
> > > > rooms. For each room, if the room needs heating, the flow
rate
> > of the
> > > > supply air for that room is controlled at min. flow rate,
and the
> > > > reheat coil for that room works to heat the supply air to
meet
> > the
> > > > requirment. If the room needs cooling, the reheat coil does
not
> > work.
> > > > The flow rate of the supply air increases to meet the
> > requirment. At
> > > > the same time, some rooms may need heating and the others
may
> > need
> > > > cooling.
> > > >
> > > > I have found the example files of VAVSingleDuctReheat.idf and
> > > > s1r3DD.idf. I think the system I need to simulate is
similar to
> > those
> > > > in the two files. However, I do not need to simulate the
> > details of
> > > > the chilled water loop and hot water loop as shown in the
two
> > files.
> > > > Is it possible to simplify those parts in the simulation?
> > > >
> > > > Thank you!
> > > >
> > > > Sincerely,
> > > > Li Zhang
> > > > Department of Mechanical Engineering
> > > > Iowa State University
> > > > Ames, IA 50010
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
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