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[EnergyPlus_Support] Re: ZoneHVAC: Ideal Loads Air system
Dear Dr. Li,
Thank you so much for your response.
Actually I modeled this office (50ft by 20ft) in openstudio and ran the simulation on Eplus.
I think you are right, I might have too many people in the room and that probably has driven the saturation temperature to 246 degrees.
I will start running simulations for design day as well from now on in order to debug the model. Thank you for pointing me in the right direction.
Sincerely yours'
Niraj Poudel
Clemson University
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
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> If you are using third party software, I am not surprised. If you are using EPlus without the proper DesignDay object data and sizing data and schedule, you may get them also.
>
> 7799 warnings is less than one every hour in an annual simulation. You may have too many people in a zone so that the RH is more than 100% driving the saturation temperature to 246 degree. This is probaboly reset to 100% by the program and continue without severe error. The moisture in a real system is condensed out at the cooling coil. You may see a number of RH = 100% values and no warnings. I am not sure, but I do not get these warnings as soon I inserted the DesignDay sizing into the IDF's submitted by the user in the group. If you move the wet-bulb temperature up in the SummerDesignDay object, you may get simillar warnings. I do not use annual simulation in the debugging stage, and can therefore track the error more easily. Dr. Li
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: nirajpoudel@...
> Date: Thu, 2 Feb 2012 21:37:16 +0000
> Subject: [EnergyPlus_Support] ZoneHVAC: Ideal Loads Air system
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> Dear all,
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> I am getting these warnings, as a matter of fact 7000+ of those warnings for my simulation. I am using the IdealLoadsAirSystem...could you please let me know what this warning means?
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> ** Warning ** Temperature out of range [-100. to 200.] (PsyPsatFnTemp)
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> ** ~~~ ** Routine=CalcPurchAirLoads, Environment=ATLANTA, at Simulation time=01/04 09:45 - 09:46
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> ** ~~~ ** Input Temperature=246.36
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> ** Warning ** Calculated Humidity Ratio invalid (PsyWFnTdbH)
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> ** ~~~ ** Routine=CalcPurchAirLoads, Environment=ATLANTA, at Simulation time=01/25 14:15 - 14:16
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> ** ~~~ ** Dry-Bulb= 13.00 Enthalpy= -66736.483
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> ** ~~~ ** Calculated Humidity Ratio= -3.1602E-002 ... Humidity Ratio set to .00001
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> ************* ===== Recurring Error Summary =====
>
> ************* The following recurring error messages occurred.
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> *************
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> ************* ** Warning ** Temperature out of range [-100. to 200.] (PsyPsatFnTemp)
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> ************* ** ~~~ ** This error occurred 430 total times;
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> ************* ** ~~~ ** during Warmup 0 times;
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> ************* ** ~~~ ** during Sizing 0 times.
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> ************* ** ~~~ ** Max=27499.636024 C Min=205.531742 C
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> *************
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> ************* ** Warning ** Calculated Humidity Ratio invalid (PsyWFnTdbH)
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> ************* ** ~~~ ** This error occurred 7366 total times;
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> ************* ** ~~~ ** during Warmup 0 times;
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> ************* ** ~~~ ** during Sizing 0 times.
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> ************* ** ~~~ ** Max=-1.029031E-004 [] Min=-2562.865899 []
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> *************
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> ************* ===== Final Error Summary =====
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> ************* The following error categories occurred. Consider correcting or noting.
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> ************* EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors.
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> ************* EnergyPlus Sizing Error Summary. During Sizing: 0 Warning; 0 Severe Errors.
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> ************* EnergyPlus Completed Successfully-- 7799 Warning; 0 Severe Errors; Elapsed Time=00hr 14min 58.52sec
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> Sincerely yours'
>
> Niraj Poudel
>
> Clemson University
>
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