[EnergyPlus_Support] Re: Variable Refrigerant system

["rikards2342" <migue885@xxxxxxxx>]

Thank you very much RRaustad!

The missing parameter was

- Variable Refrigerant Flow Heat Pump CrankCase Heater Electric Consumption

I added this parameter and the sums match. Regarding the fan energy I didn't include it because is counted separately in the html results (cooling, heating and fans are shown separately).





--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, RRaustad@... wrote:
>
> You forgot to include the fan energy. Crankcase heater energy is also a
> missing component as is evaporatively cooled condenser pump power if
> you are using these options.
> 
> Zone Terminal Unit Cooling Electric Consumption
> Zone Terminal Unit Heating Electric Consumption (for all zones)
> 
> These are the parasitics related to the terminal unit's parasitic
> inputs and depends on which mode (cooling or heating) the system is
> currently operating in.
> 
> ZoneHVAC:TerminalUnit:VariableRefrigerantFlow,
>  30, !- Zone Terminal Unit On Parasitic Electric Energy Use {W}
>  20; !- Zone Terminal Unit Off Parasitic Electric Energy Use {W}
> 
> 
> Variable Refrigerant Flow Heat Pump Cooling Electric Consumption
> Variable Refrigerant Flow Heat Pump Heating Electric Consumption
> 
> These should provide the outdoor unit electric consumption. Adding
> these should give the total outdoor unit electric consumption over the
> year.
> 
> Variable Refrigerant Flow Heat Pump Electric Defrost Consumption (
> 
> The is the electric consumption due to defrost. After reviewing the
> code, I am not exactly sure if this is included in Variable Refrigerant
> Flow Heat Pump Heating Electric Consumption since the calculation of
> defrost energy is indirectly included in total electric consumption as
> a fraction of energy use. I do see that defrost electric consumption is
> included in the operating COP calculation which infers it is a seperate
> energy use calculation.
> 
> Carefully review the sum of all inputs to the model (fan + terminal
> unit parasitics + outdoor unit electric consumption + defrost + evap
> condenser pump + basin heater electric consumption)
> 
> 
> 
> 
> On Fri, 07 Dec 2012 19:34:47 +0000 rikards2342 <migue885@...>
> wrote:
> > Dear community, I simulated a variable refrigerant system with 8
> > AirConditioner:VaribleRefrigerantFlow (8 external units) and a lot of internal
> > units. The simulation results are correct, but I want to know the individual
> > electric consumption of each external unit and in the html table only appears
> > the total consumption of all HVACs (section end uses, heating and cooling).
> > I tried to sum (using output:variable results in excel) the following items:
> > 
> > - Zone Terminal Unit Cooling Electric Consumption 
> > - Zone Terminal Unit Heating Electric Consumption (for all zones)
> > - Variable Refrigerant Flow Heat Pump Cooling Electric Consumption
> > - Variable Refrigerant Flow Heat Pump Heating Electric Consumption
> > - Variable Refrigerant Flow Heat Pump Electric Defrost Consumption (for all
> > external units)
> > 
> > But the sum of these parameters isn't the same that the sum of the heating and
> > cooling electricity given in the html results table. The difference is very
> > small.
> > 
> > Anyone knows which is the parameter I don't take into account?
> > 
> > Thank you very much in advance!
> > 
> > ------------------------------------
> > 
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> > 
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> > 
> >
>



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