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Re: [EnergyPlus_Support] Problem with UpdateZoneSizing: Heating supply air temperature
No. Look in the ioref at the sizing:plant object. You can (now) size the equipment as one does in Europe, by ventilation rate, so that the AHU does not try and meet the zone loads, just brings the air in at the specified temp.
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 01.05.2014, at 09:39, Marco Aldegheri <<mailto:m.aldegheri@xxxxxxxxx>m.aldegheri@xxxxxxxxx> wrote:
>
> 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 <<mailto:m.aldegheri@xxxxxxxxx>m.aldegheri@xxxxxxxxx> wrote:
> On Wednesday, April 30, 2014 11:35 PM, "<mailto:jeannieboef@xxxxxxxxx>jeannieboef@xxxxxxxxx" <<mailto: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><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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