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Re: [EnergyPlus_Support] Re: VAV single duct reheat
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@xxxxxxxxx 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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