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Re: [EnergyPlus_Support] Warnings in the HVAC simulation
It depends what you are testing. I typically put all the other zones on a different system. I also leave the test zone's AHU componants on autosize. I only consider usage energy and not AHU or other plant operating energy consumptions, because they don't refect the economies of scale.
No one said this job is easy. :-)
Mit freundlichen Grü�en- Sent from my iPhone (excuse the brevity)
i. A.
Jean Marais
b.i.g. bechtold
Tel. +49 30 6706662-23
On 16.05.2014, at 16:54, "<mailto:luca.guj@xxxxxxxxx>luca.guj@xxxxxxxxx [EnergyPlus_Support]" <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
>
Hi Jean,
>
> first of all thanks. I have corrected my model as follows:
> Sizing:System,
Air Loop HVAC 1, !- AirLoop Name
VentilationRequirement, !- Type of Load to Size On
autosize, !- Design Outdoor Air Flow Rate {m3/s}
1, !- Minimum System Air Flow Ratio
7, !- Preheat Design Temperature {C}
0.008, !- Preheat Design Humidity Ratio {kgWater/kgDryAir}
12.8, !- Precool Design Temperature {C}
0.008, !- Precool Design Humidity Ratio {kgWater/kgDryAir}
12.8, !- Central Cooling Design Supply Air Temperature {C}
16.7, !- Central Heating Design Supply Air Temperature {C}
NonCoincident, !- Sizing Option
Yes, !- 100% Outdoor Air in Cooling
Yes, !- 100% Outdoor Air in Heating
0.0085, !- Central Cooling Design Supply Air Humidity Ratio {kgWater/kgDryAir}
0.008, !- Central Heating Design Supply Air Humidity Ratio {kgWater/kgDryAir}
DesignDay, !- Cooling Design Air Flow Method
0, !- Cooling Design Air Flow Rate {m3/s}
DesignDay, !- Heating Design Air Flow Method
0, !- Heating Design Air Flow Rate {m3/s}
ZoneSum; !- System Outdoor Air Method
> Sizing:Zone,
1 Concrete Coated, !- Zone or ZoneList Name
SupplyAirTemperature, !- Zone Cooling Design Supply Air Temperature Input Method
14, !- Zone Cooling Design Supply Air Temperature {C}
, !- Zone Cooling Design Supply Air Temperature Difference {deltaC}
SupplyAirTemperature, !- Zone Heating Design Supply Air Temperature Input Method
40, !- Zone Heating Design Supply Air Temperature {C}
, !- Zone Heating Design Supply Air Temperature Difference {deltaC}
0.0085, !- Zone Cooling Design Supply Air Humidity Ratio {kgWater/kgDryAir}
0.008, !- Zone Heating Design Supply Air Humidity Ratio {kgWater/kgDryAir}
DemonstratorSpecOutdoorAir, !- Design Specification Outdoor Air Object Name
, !- Zone Heating Sizing Factor
, !- Zone Cooling Sizing Factor
DesignDay, !- Cooling Design Air Flow Method
0, !- Cooling Design Air Flow Rate {m3/s}
0.000762, !- Cooling Minimum Air Flow per Zone Floor Area {m3/s-m2}
0, !- Cooling Minimum Air Flow {m3/s}
0, !- Cooling Minimum Air Flow Fraction
DesignDay, !- Heating Design Air Flow Method
0, !- Heating Design Air Flow Rate {m3/s}
0.002032, !- Heating Maximum Air Flow per Zone Floor Area {m3/s-m2}
0.1415762, !- Heating Maximum Air Flow {m3/s}
0.3, !- Heating Maximum Air Flow Fraction
1 Concrete Coated Design Spec Zone Air Dist; !- Design Specification Zone Air Distribution Object Name
> We this configuration I get much better result in terms of energy consumption which are much closer to the experimental data which I actually have measured. But I still get many warnings like before:
> Warning ** CalcDoe2DXCoil: Coil:Cooling:DX:SingleSpeed="OS:COIL:COOLING:DX:SINGLESPEED 4 ALUMINUM NON COATED" - Air volume flow rate per watt of rated total cooling capacity is out of range at 2.046E-005 m3/s/W.
~~~ ** Environment=RUN PERIOD 1, at Simulation time=01/01 08:15 - 08:30 ~~~ ** Expected range for VolumeFlowPerRatedTotalCapacity=[2.684E-005--6.713E-005] ~~~ ** Possible causes include inconsistent air flow rates in system components,
> Warning ** CalcDoe2DXCoil: Coil:Cooling:DX:SingleSpeed="OS:COIL:COOLING:DX:SINGLESPEED 4 ALUMINUM NON COATED" - Air volume flow rate per watt of rated total cooling capacity is out of range error continues.
~~~ ** This error occurred 15498 total times; ~~~ ** during Warmup 0 times; ~~~ ** during Sizing 0 times. ~~~ ** Max=2.178820E-005 Min=2.021210E-005
> I think that i have understood why I get these warnings: the 4 zones that i'm studying don't have any load, i.e. people, equipment....., in fact they are experimental setups, therefore E+ is not performing the sizing and is using the sizing performed for the huge building also included in the model. So How do I solve this issue??
> Warning ** Calculated design heating load for zone=1 CONCRETE COATED is zero.
~~~ ** Check Sizing:Zone and ZoneControl:Thermostat inputs.
Warning ** Calculated design heating load for zone=2 CONCRETE NON COATED is zero.
~~~ ** Check Sizing:Zone and ZoneControl:Thermostat inputs.
Warning ** Calculated design heating load for zone=3 ALUMINUM COATED is zero.
~~~ ** Check Sizing:Zone and ZoneControl:Thermostat inputs.
Warning ** Calculated design heating load for zone=4 ALUMINUM NON COATED is zero.
~~~ ** Check Sizing:Zone and ZoneControl:Thermostat inputs.
I have a attached the file in case you want to give a try.
Thanks in advance for your support.
> Luca Guj
>
>
> <Dubai12_RealAC_Tuning1_26_32_22.idf>
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