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[EnergyPlus_Support] Re: LowTemperatureRadiant:VariableFlow No HVAC Energy Use
Hi Amalia,
I did finally identify the issue with my model. On the heating side I switched the PlantEquipmentOperation from Uncontrolled to HeatingLoad. This resulted in reasonable heating operation. On the cooling side I had the cooling water supply temperature schedule input in Fahrenheit instead of Celsius, so it was never turning on. I realize how important it is to meticulously comb through these models as they are very sensitive to the slightest user input error. Good luck!
Alea
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "amalia" <amalia1706@...> wrote:
>
> Hello Alea
>
> I am also new in EnergyPlus and I am having the same issues in modelling a radiant floor heating. Did you get any answers in how to model the system?
>
> Thank you
> Amalia
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Alea German <agerman@> wrote:
> >
> > Here are the warnings that I'm receiving
> > ************* Testing Individual Branch Integrity
> > ************* All Branches passed integrity testing
> > ************* Testing Individual Supply Air Path Integrity
> > ************* All Supply Air Paths passed integrity testing
> > ************* Testing Individual Return Air Path Integrity
> > ************* All Return Air Paths passed integrity testing
> > ************* No node connection errors were found.
> > ************* Beginning Simulation
> > ** Warning ** Enthalpy out of range (PsyTsatFnHPb)
> > ** ~~~ ** Routine=CalcDoe2DXCoil, Environment=SACRAMENTO EXEC AP CA 1952 SQFT, at Simulation time=01/01 15:00 - 16:00
> > ** ~~~ ** Enthalpy=-45367.04440 Pressure= 102700.00
> > ** ~~~ ** Initial Resultant Temperature= -59.98
> > ** Warning ** Temperature out of range [-100. to 200.] (PsyPsatFnTemp)
> > ** ~~~ ** Routine=PsyWFnTdbTwbPb, Environment=SACRAMENTO EXEC AP CA 1952 SQFT, at Simulation time=01/05 12:00 - 13:00
> > ** ~~~ ** Input Temperature=-193.92
> > ** Warning ** GetSpecificHeatGlycol: Temperature is out of range (too high) for fluid specific heat **
> > ** ~~~ ** ..Called From:UpdateSolarCollector Fluid name =WATER,Temperature=129.95
> > ** ~~~ ** Environment=SACRAMENTO EXEC AP CA 1952 SQFT, at Simulation time=01/19 11:00 - 12:00
> > ** Warning ** Coil:WaterHeating:AirToWaterHeatPump "HPWH BOTTOM COIL" - Air volume flow rate per watt of rated total water heating capacity is out of range at 8.07E-005 m3/s/W.
> > ** ~~~ ** Environment=SACRAMENTO EXEC AP CA 1952 SQFT, at Simulation time=01/20 10:00 - 11:00
> > ** ~~~ ** Expected range for VolumeFlowPerRatedTotalCapacity=[2.684E-005--8.056E-005]
> > ** ~~~ ** Possible causes may be that the parent object is calling for an actual supply air flow rate that is much higher or lower than the DX coil rated supply air flow rate.
> > ** Warning ** Coil:WaterHeating:AirToWaterHeatPump "HPWH TOP COIL" - Air volume flow rate per watt of rated total water heating capacity is out of range at 8.07E-005 m3/s/W.
> > ** ~~~ ** Environment=SACRAMENTO EXEC AP CA 1952 SQFT, at Simulation time=01/20 10:00 - 11:00
> > ** ~~~ ** Expected range for VolumeFlowPerRatedTotalCapacity=[2.684E-005--8.056E-005]
> > ** ~~~ ** Possible causes may be that the parent object is calling for an actual supply air flow rate that is much higher or lower than the DX coil rated supply air flow rate.
> > ** Warning ** GetDensityGlycol: Temperature is out of range (too high) for fluid density **
> > ** ~~~ ** ..Called From:PlantPumps:CalcPumps: Fluid name =WATER,Temperature=100.27
> > ** ~~~ ** Environment=SACRAMENTO EXEC AP CA 1952 SQFT, at Simulation time=05/27 13:00 - 14:00
> > ** Warning ** WaterHeater:HeatPump "HPWH TOP"
> > ** ~~~ ** Heat pump water heater compressor part-load ratio calculation failed: PLR limits of 0 to 1 exceeded. Part-load ratio used = 5.263E-004
> > ** ~~~ ** Please send this information to the EnergyPlus support group.
> > ** ~~~ ** This error occured in heating mode. Environment=SACRAMENTO EXEC AP CA 1952 SQFT, at Simulation time=06/12 11:30 - 11:40
> > ************* Simulation Error Summary *************
> > ************* ===== Recurring Error Summary =====
> > ************* The following recurring error messages occurred.
> > *************
> > ************* ** Warning ** Plant loop falling below lower temperature limit, PlantLoop="ZONE SUPPLY HEATING WATER LOOP"
> > ************* ** ~~~ ** This error occurred 96617 total times;
> > ************* ** ~~~ ** during Warmup 4459 times;
> > ************* ** ~~~ ** during Sizing 0 times.
> > ************* ** ~~~ ** Min=11.925999
> > *************
> > ************* ** Warning ** WaterHeater:HeatPump "HPWH BOTTOM: Water heater tank set point temperature is greater than or equal to the cut-in temperature of the heat pump water heater. Heat Pump will be disabled error continues...
> > ************* ** ~~~ ** This error occurred 17323 total times;
> > ************* ** ~~~ ** during Warmup 0 times;
> > ************* ** ~~~ ** during Sizing 0 times.
> > ************* ** ~~~ ** Max=54.434444 Min=54.434444
> > *************
> > ************* ** Warning ** WaterHeater:HeatPump "HPWH TOP: Water heater tank set point temperature is greater than or equal to the cut-in temperature of the heat pump water heater. Heat Pump will be disabled error continues...
> > ************* ** ~~~ ** This error occurred 17323 total times;
> > ************* ** ~~~ ** during Warmup 0 times;
> > ************* ** ~~~ ** during Sizing 0 times.
> > ************* ** ~~~ ** Max=54.434444 Min=54.434444
> > *************
> > ************* ** Warning ** GetSpecificHeatGlycol: Temperature out of range (too low) for fluid specific heat
> > ************* ** ~~~ ** This error occurred 349 total times;
> > ************* ** ~~~ ** during Warmup 0 times;
> > ************* ** ~~~ ** during Sizing 0 times.
> > ************* ** ~~~ ** Max=-0.165525 {C} Min=-1.99296 {C}
> > *************
> > ************* ** Warning ** Enthalpy out of range (PsyTsatFnHPb)
> > ************* ** ~~~ ** This error occurred 24547 total times;
> > ************* ** ~~~ ** during Warmup 0 times;
> > ************* ** ~~~ ** during Sizing 0 times.
> > ************* ** ~~~ ** Max=-42400.733468 J/kg Min=-4103024.083166 J/kg
> > *************
> > ************* ** Warning ** Temperature out of range [-100. to 200.] (PsyPsatFnTemp)
> > ************* ** ~~~ ** This error occurred 23573 total times;
> > ************* ** ~~~ ** during Warmup 0 times;
> > ************* ** ~~~ ** during Sizing 0 times.
> > ************* ** ~~~ ** Max=-100.001543 C Min=-4100.987758 C
> > *************
> > ************* ** Warning ** GetSpecificHeatGlycol: Temperature out of range (too high) for fluid specific heat
> > ************* ** ~~~ ** This error occurred 9420 total times;
> > ************* ** ~~~ ** during Warmup 0 times;
> > ************* ** ~~~ ** during Sizing 0 times.
> > ************* ** ~~~ ** Max=214.334179 {C} Min=125.078934 {C}
> > *************
> > ************* ** Warning ** Coil:WaterHeating:AirToWaterHeatPump "HPWH BOTTOM COIL" - Air volume flow rate per watt of rated total water heating capacity is out of range error continues...
> > ************* ** ~~~ ** This error occurred 7264 total times;
> > ************* ** ~~~ ** during Warmup 0 times;
> > ************* ** ~~~ ** during Sizing 0 times.
> > ************* ** ~~~ ** Max=8.089278E-005 Min=8.057985E-005
> > *************
> > ************* ** Warning ** Coil:WaterHeating:AirToWaterHeatPump "HPWH TOP COIL" - Air volume flow rate per watt of rated total water heating capacity is out of range error continues...
> > ************* ** ~~~ ** This error occurred 7472 total times;
> > ************* ** ~~~ ** during Warmup 0 times;
> > ************* ** ~~~ ** during Sizing 0 times.
> > ************* ** ~~~ ** Max=8.089278E-005 Min=8.057985E-005
> > *************
> > ************* ** Warning ** GetDensityGlycol: Temperature out of range (too high) for fluid density
> > ************* ** ~~~ ** This error occurred 7335 total times;
> > ************* ** ~~~ ** during Warmup 0 times;
> > ************* ** ~~~ ** during Sizing 0 times.
> > ************* ** ~~~ ** Max=105.916237 {C} Min=100.000385 {C}
> > *************
> > ************* ** Warning ** WaterHeater:HeatPump "HPWH TOP": Part-load ratio calculation failed in heating mode warning continues. Part-load ratio statistics follow.
> > ************* ** ~~~ ** This error occurred 7 total times;
> > ************* ** ~~~ ** during Warmup 0 times;
> > ************* ** ~~~ ** during Sizing 0 times.
> > ************* ** ~~~ ** Max=5.314939E-004 Min=2.191069E-004
> > *************
> > ************* ** Warning ** Plant loop exceeding upper temperature limit, PlantLoop="SDHW LOOP"
> > ************* ** ~~~ ** This error occurred 46 total times;
> > ************* ** ~~~ ** during Warmup 0 times;
> > ************* ** ~~~ ** during Sizing 0 times.
> > ************* ** ~~~ ** Max=106.378306
> >
>
------------------------------------
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