[EnergyPlus_Support] Re: Water-to-Air Heatpump Issues

["energyplus99" <energyplus99@xxxxxxxxx>]

Mike,

Thanks for passing this on.  As soon as the modeler has either an 
explanation and/or a fix, please let me know.  Again, thanks for your 
help.

-Chuck



--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
<mjwitte@...> wrote:
>
> I can reproduce the problem here.  I cannot say for sure what is 
wrong.  I have 
> passed this along to the water-to-air heat pump model developer.
> 
> Mike
> 
> 
> On 29 Apr 2007 at 22:00, energyplus99 wrote:
> 
> > (1) If I run the HeatPumpWaterToAirEquationFit.idf example as-is 
the 
> > supplementary heating coil kicks in during the winter design-day 
and 
> > stays off during the summer design-day as I would expect it to.  
You 
> > can see this on the "Heating Coil Rate" column "AY" on output 
> > HeatPumpWaterToAirEquationFit.csv.
> > 
> > If I now reduce the "Rated Air Volumetric Flow Rate" parm on the 
> > objects COIL:WATERTOAIRHP:EquationFit:COOLING and 
> > COIL:WATERTOAIRHP:EquationFit:HEATING to 1.2 (from 2.0), I start 
to 
> > see significant supplementary heating during the summer design-
day!  
> > I would have expected an increase in the supplementary during the 
> > winter but not during the summer.  For the summer, I would expect 
> > zone temperatures to rise as the cooling coil is less able to 
meet 
> > the load.
> > 
> > In my own heatpump run (not HeatPumpWaterToAirEquationFit.idf) I 
get 
> > a similar pattern.  Namely, if I set the Flowrate parm to the 
> > heatpump design airflow calculated through an autoresize run or 
the 
> > published airflow rate from the manufacturer, the supplementary 
> > heater is completely off during the winter design-day and always 
on 
> > during the summer design-day!  This leaves me not sure what value 
to 
> > use for this parameter.  Any ideas?  My goal is to get an 
accurate 
> > estimate of the supplementary heating demand I will need for the 
> > heatpump and building design I have tentatively chosen.
> > 
> > (2) In all runs involving the above-mentioned objects, I can't 
seem 
> > to get electric power-related report variables to indicate 
anything 
> > other than zeros on the .csv outputs (eg "Power [W]", column "AK" 
in 
> > the above example csv).  Is this a bug or am I doing something 
wrong?
> 
> 
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support      
> EnergyPlus-Support@...
>




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