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Re: [EnergyPlus_Support] Problem with UpdateZoneSizing: Heating supply air temperature
On Wednesday, April 30, 2014 11:35 PM, "jeannieboef@xxxxxxxxx" <jeannieboef@xxxxxxxxx> wrote:
Without looking at the attatchments, I suspect that you have not set the (I think third field) sizing:system object to size by ventilation rate instead of sensible load.
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 30.04.2014, at 23:02, <<mailto:m.aldegheri@xxxxxxxxx>m.aldegheri@xxxxxxxxx> wrote:
>
Dear all,
>
> I'm having some trouble with a simulation.
>
> In my idf, the HVAC system is composed of 2 different entities: a radiant low temperature heating system and a mechanical ventilation system which should provide only a defined air change in my zones. Each of them works only during winter time.
>
> I upload the .svg to show how the system is realized. In particolar, my mec vent system is not properly a heating system, it provides an only airflow but with a control on the temperature. Just before the entrance of the air flux in a zone, there is a heating coil which should increase the incoming air temperature until 18°C, if the outside air temperature is less than 18°C. If the outside air temperature is >18°C the air flux is not heated by this coil. I should have set this using SetpointManager:OutdoorAirReset,
>
> SetpointManager:OutdoorAirReset,
> Air Loop Setpoint Manager, !- Name
> Temperature, !- Control Variable
> 18.00, !- Setpoint at Outdoor Low Temperature {C}
> -20.00, !- Outdoor Low Temperature {C}
> 18.00, !- Setpoint at Outdoor High Temperature {C}
> 18.00, !- Outdoor High Temperature {C}
> Air Loop Setpoint Manager Node List; !- Setpoint Node or NodeList Namet;
>
> I would like to ask you if do you mind how to fix this error. I have many severe errors like this one, one error for each thermal zone.
>
> ** Severe ** UpdateZoneSizing: Heating supply air temperature (calculated) within 2C of zone temperature
> ** ~~~ ** ...check zone thermostat set point and design supply air temperatures
> ** ~~~ ** ...zone name = P0:P0%A1ZN4B
> ** ~~~ ** ...design heating load = 0.00 W
> ** ~~~ ** ...thermostat set piont temp = 0.000 C
> ** ~~~ ** ...zone temperature = 17.898 C
> ** ~~~ ** ...supply air temperature = 18.000 C
> ** ~~~ ** ...temperature difference = 0.10230 C
> ** ~~~ ** ...calculated volume flow rate = 8253.19807 m3/s
> ** ~~~ ** ...calculated mass flow rate = 9723.31707 kg/s
>
> Maybe the problem is in the design supply air temperatures, which I set to 18°C but I don't understand exaclty what's wrong...
> !- =========== ALL OBJECTS IN CLASS: SIZING:ZONE ===========
>
> Sizing:Zone,
> P0:P0%A1Zn5i, !- Zone or ZoneList Name
> SupplyAirTemperature, !- Zone Cooling Design Supply Air Temperature Input Method
> 14.00, !- Zone Cooling Design Supply Air Temperature {C}
> 5.00, !- Zone Cooling Design Supply Air Temperature Difference {deltaC}
> SupplyAirTemperature, !- Zone Heating Design Supply Air Temperature Input Method
> 18, !- Zone Heating Design Supply Air Temperature {C}
> 15.00, !- Zone Heating Design Supply Air Temperature Difference {deltaC}
> 0.0090, !- Zone Cooling Design Supply Air Humidity Ratio {kgWater/kgDryAir}
> 0.0040, !- Zone Heating Design Supply Air Humidity Ratio {kgWater/kgDryAir}
> P0:P0%A1Zn5i Design Specification Outdoor Air Object, !- Design Specification Outdoor Air Object Name
> 1.25, !- Zone Heating Sizing Factor
> 1.15, !- Zone Cooling Sizing Factor
> DesignDay, !- Cooling Design Air Flow Method
> 0.000000, !- Cooling Design Air Flow Rate {m3/s}
> 0.000760, !- Cooling Minimum Air Flow per Zone Floor Area {m3/s-m2}
> 0.000000, !- Cooling Minimum Air Flow {m3/s}
> 0.00, !- Cooling Minimum Air Flow Fraction
> DesignDay, !- Heating Design Air Flow Method
> 0.000000, !- Heating Design Air Flow Rate {m3/s}
> 0.002030, !- Heating Maximum Air Flow per Zone Floor Area {m3/s-m2}
> 0.141580, !- Heating Maximum Air Flow {m3/s}
> 0.30, !- Heating Maximum Air Flow Fraction
> P0:P0%A1Zn5i Design Specification Zone Air Distribution Object; !- Design Specification Zone Air Distribution Object Name
>
> Thank you all,
Marco
>
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