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Re: [EnergyPlus_Support] Problem with UpdateZoneSizing: Heating supply air temperature




Do you mean the Design outdoor Air Flow rate? Actually it was on: autosize. I set the maximum design air flow for the fans with a project value but maybe the field you are speaking about should be set to the same value.
I have changed it and I'm trying another run.
In an hour I'll have the results.
On , Marco Aldegheri <m.aldegheri@xxxxxxxxx> wrote:
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 GrüÃ?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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