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

["Michael J. Witte" <mjwitte@xxxxxxxx>]

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@xxxxxxxx





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