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Re: [EnergyPlus_Support] Anomalous results with ** Warning ** GetAirPathData: & ** Warning ** WetBulb
Where 16 is the required temp at Toda>18...
> SetpointManager:OutdoorAirReset,
> Air Loop Setpoint Manager, !- Name
> Temperature, !- Control Variable
> 18.00, !- Setpoint at Outdoor Low Temperature {C}
> 18.00, !- Outdoor Low Temperature {C}
> 7.00, !- Setpoint at Outdoor High Temperature {C}
> 18.01, !- Outdoor High Temperature {C}
> Air Loop Setpoint Manager Node List; !- Setpoint Node or NodeList Name
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 05.06.2014, at 22:20, "Marco Aldegheri <mailto:m.aldegheri@xxxxxxxxx>m.aldegheri@xxxxxxxxx [EnergyPlus_Support]" <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
>
> Anyway, I should add some informations about the main topic.
>
> I still have problems with the air system.
> The air loop is composed by
> Outdoor air --> heat exchanger --> electric coil -->Zone -->heat exchanger--Outdoor
> The electric coil should increase the incoming air temperature to 18°C if the T outdoor is lower than 18°, than it should not heat the air flow if the external air is warmer than 18°C.
>
> Is it possible to reproduce this mechanism?
>
> I used the
>
> 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 Name
>
> but I'm obtaining an unexpected result. If I look at the temperature of the air just after the coil
>
> Output:Variable,
> Air Loop AHU Heating Coil Air Outlet Node !- Key Value
> System Node Temperature, !- Variable Name
> Hourly; !- Reporting Frequency
>
> I can see the graph i'm uploading.
> As you can see the temperature is 18 only when the site outdoor temperature is very low, and it increases when the site outdoor temperature increases. It should not increase. The coil should not work where Tout>18°C
>
> I tried also a setpoint manager schedule with a schedule of 18°C for all time but the coil has a very very similar behaviur.
>
> Am I trying to do something impossible or there is a solution?
>
> Thanks,
> Marco
>
> On Thursday, June 5, 2014 9:50 PM, "Marco Aldegheri <mailto:m.aldegheri@xxxxxxxxx>m.aldegheri@xxxxxxxxx [EnergyPlus_Support]" <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
>
>
>
Thanks, Jean.
It was my fault. I didn't realized that I was using a fake version of the weather file used by Db.
Forgive me, now it's ok.
>
> Marco
>
>
> On Thursday, June 5, 2014 9:27 AM, "<mailto:'jeannieboef@xxxxxxxxx>'jeannieboef@xxxxxxxxx' <mailto:jeannieboef@xxxxxxxxx>jeannieboef@xxxxxxxxx [EnergyPlus_Support]" <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
>
>
>
If you don't have another machine to run it on, send me the idf privately.
>
> 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 04.06.2014, at 18:53, "Marco Aldegheri <mailto:m.aldegheri@xxxxxxxxx><mailto:m.aldegheri@xxxxxxxxx>m.aldegheri@xxxxxxxxx [EnergyPlus_Support]" <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx><mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
>
>>
Uhmm it's very strage, the txt are just the same.
>>
>> I don't understand why it's happening so. Jean, please, could I ask you a courtesy?
>> Do you see any difference between the zone mean air temperature of the DB file and the idf processed by e+?
>> On my pc e+ shows me a non-sense.
>> Could you make a try? The file is very fast to run.
>>
>> Marco
>>
>>
>> On Tuesday, June 3, 2014 1:45 PM, "<mailto:'jeannieboef@xxxxxxxxx><mailto:'jeannieboef@xxxxxxxxx>'jeannieboef@xxxxxxxxx' <mailto:jeannieboef@xxxxxxxxx><mailto:jeannieboef@xxxxxxxxx>jeannieboef@xxxxxxxxx [EnergyPlus_Support]" <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx><mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
>>
>>
>>
Hi Marco,
Do a text compare of the in.idf file located in the DesignBuilder energyplus folder, and the exported idf. They should be the same. If not, I would notify DesignBuilder via a helpdesk ticket. Let me know what you find.
Regards,
>>
>> 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 02.06.2014, at 16:55, "<mailto:m.aldegheri@xxxxxxxxx><mailto:m.aldegheri@xxxxxxxxx><mailto:m.aldegheri@xxxxxxxxx>m.aldegheri@xxxxxxxxx [EnergyPlus_Support]" <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx><mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx><mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
>>
>>>
Hi all,
>>>
>>> I'm testing an air heating system on a minimodel.
>>> I created it with DesignBuilder and in DB I obtained an apparently correct internal temperature vs time.
>>> Than I explorted the idf and I processed the idf (no modified, of course) with E+. The zone mean air temperature now is completely different and in my opinion completely out of mind.
>>>
>>> The heating system just takes the air from the outside and heat the flux untill 18°c if the air temperature is lower than this value.
>>>
>>> In particular I have 2 suspicious warnings, they are:
>>>
>>> ************* Beginning System Sizing Calculations
>>> ** Warning ** GetAirPathData: AirLoopHVAC="AIR LOOP" has no Controllers.
>>>
>>> and
>>>
>>> ************* Beginning Simulation
>>> ** Warning ** WetBulb not converged after 101 iterations(PsyTwbFnTdbWPb)
>>> ** ~~~ ** Routine=Unknown, Environment=UNTITLED, at Simulation time=03/28 15:00 - 15:06
>>> ** ~~~ ** Input Temperature = 18.50
>>> ** ~~~ ** Input Humidity Ratio= 0.141212
>>> ** ~~~ ** Input Pressure = 99122.00
>>> ** ~~~ ** Resultant Temperature= 25.44
>>>
>>> Thanks,
>>> Marco
>>> <PROVA VENT.rar>
>>
>
>
>
>
>
> <IMG1.png>
> <IMG2.png>
> <IMG3.png>
> <EDIFICIO IMPIANTO CORRETTO.idf>
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