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Re: [EnergyPlus_Support] Re: Warnings

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Re: Warnings
From: "Michael J. Witte" <mjwitte@xxxxxxxx>
Date: Fri, 3 Jun 2005 13:49:33 -0500
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Look at the zone sizing information for the first zone:

Zone Sizing, ZONE 1, Cooling,   2061.7    ,   1148.6    ,   1148.6    , CHICAGO 
ILLINOIS SUMMER, 19:00:00,   29.076    ,  0.14507E-01  

The cooling design load is 2061.7 W and the calculated flow rate is 1148.6 m3/s 
- that's enormous.  Something is wrong with the zone thermostat setpoint or the 
cooling supply temperature in the ZONE SIZING object.  

Mike


On 3 Jun 2005, at 13:37, marieodeline wrote:

> Dear all,
> 
> I am trying to simulate my first buidling with EnergyPlus: a very 
> basic building with two thermostatic rooms. I am trying to add a 
> Night Cycle Manager, but similar alerts occured.
> 
>    ************* Testing Individual Branch Integrity
>    ************* All Branches passed integrity testing
>    ************* Testing Individual Supply Air Path Integrity
>    ************* All Supply Air Paths passed integrity testing
>    ************* Testing Individual Return Air Path Integrity
>    ************* All Return Air Paths passed integrity testing
>    ************* No node connection errors were found.
>    ** Warning ** Enthalpy out of range (PsyTsatFnHPb)
>    **   ~~~   **  Occurrence info=CHICAGO ILLINOIS SUMMER, 07/21 
> 00:15 - 00:30
>    **   ~~~   **  Enthalpy=-3722890.49462 Pressure= 99433.54
>    **   ~~~   **  Initial Resultant Temperature= -59.98
>    ** Warning ** Temperature out of range [-100. to 200.] 
> (PsyPsatFnTemp)
>    **   ~~~   **  Occurrence info=CHICAGO ILLINOIS SUMMER, 07/21 
> 00:15 - 00:30
>    **   ~~~   **  Input Temperature=-3710.86
>    ** Warning ** Temperature out of range [-100. to 200.] 
> (PsyPsatFnTemp)
>    **   ~~~   **  Occurrence info=CHICAGO ILLINOIS SUMMER, 07/21 
> 00:15 - 00:30
>    **   ~~~   **  Input Temperature=-3722.73
> 
> .......
> 
> As you adviced, I checked the autosized cooling coil capacity in the 
> eio output. But the air volume flow rates doesn't seem reasonable at 
> all.
> 
> Could you figure out the sources of this problem?
> 
> Here is my .eio file.
> *******************************
> shadowing/Sun Position Calculations, 20
> ! <Zone Internal Gains/Equipment Information - Nominal>,Zone Name, 
> Floor Area {m2}, # Occupants, Area per Occupant {m2/person}, Occupant 
> per Area {person/m2}, General Lighting {w/m2}, Task Lighting {w/m2}, 
> Electric Load {w/m2}, Gas Load {w/m2}, Other Load {w/m2}, Hot Water 
> Eq {w/m2}, Outdoor Controlled Baseboard Heat
>  Zone Internal Gains, ZONE 1,  80.000,   
> 0.000,N/A,0.000E+000,0.000E+000,0.000E+000,0.000E+000,0.000E+000,0.000
> E+000,0.000E+000,No 
>  Zone Internal Gains, ZONE 2,  80.000,   
> 0.000,N/A,0.000E+000,0.000E+000,0.000E+000,0.000E+000,0.000E+000,0.000
> E+000,0.000E+000,No 
> ! <AirFlow Model>, Simple/Comis
>  AirFlow Model, Simple
> ! <RoomAir Model>, Zone Name, Mixing/Mundt/ReesHaves/UCSDDV
> RoomAir Model,ZONE 2,Mixing/Well-Stirred
> ! <Zone Volume Capacitance Multiplier, Value>
> Zone Volume Capacitance Multiplier,   1.000
> ! <Load Time Steps in Zone Design Calculation Averaging Window>, Value
>  Time Steps in Averaging Window,    4
> ! <Sizing Factor Information>, Sizing Factor ID, Value
>  Sizing Factor, Global,   1.0000    
> ! <Zone Sizing Information>, Zone Name, Load Type, DesLoad {W}, Calc 
> Des Air Flow Rate {m3/s}, UserDes Air Flow Rate {m3/s}, Design Day 
> Name, Time of Peak, Temperature at Peak {C}, Humidity Ratio at Peak 
> {kgWater/kgAir}
>  Zone Sizing, ZONE 1, Cooling,   2061.7    ,   1148.6    ,   
> 1148.6    , CHICAGO ILLINOIS SUMMER, 19:00:00,   29.076    ,  
> 0.14507E-01
>  Zone Sizing, ZONE 1, Heating,   3122.3    ,  0.81862E-01,  0.81862E-
> 01, CHICAGO ILLINOIS WINTER, 09:00:00,  -25.650    ,  0.10000E-04
>  Zone Sizing, ZONE 2, Cooling,   1038.1    ,  0.84182    ,  
> 0.84182    , CHICAGO ILLINOIS SUMMER, 18:00:00,   30.491    ,  
> 0.14507E-01
>  Zone Sizing, ZONE 2, Heating,   3351.3    ,  0.93723E-01,  0.93723E-
> 01, CHICAGO ILLINOIS WINTER, 09:00:00,  -25.650    ,  0.10000E-04
> ! <System Sizing Information>, System Name, Field Description, Value
>  System Sizing, VAV SYS 1, Calculated cooling design air flow rate 
> [m3/s],   1149.4    
>  System Sizing, VAV SYS 1, Calculated heating design air flow rate 
> [m3/s],  0.17559    
> ! <Environment>,Environment Name,Environment Type, Start Date, End 
> Date, Start DayOfWeek, Duration {#days}, Source:Start DayOfWeek,  Use 
> Daylight Saving, Use Holidays, Apply Weekend Holiday Rule,  Use Rain 
> Values, Use Snow Values
> ! <Environment:Special Days>, Special Day Name, Special Day Type, 
> Source, Start Date, Duration {#days}
> ! <Environment:Daylight Saving>, Daylight Saving Indicator, Source, 
> Start Date, End Date
> ! <Environment:WarmupDays>, NumberofWarmupDays
> Environment,CHICAGO ILLINOIS SUMMER,DesignDay, 7/21, 
> 7/21,SummerDesignDay,  1,N/A,N/A,N/A,N/A,N/A,N/A
> Environment:Daylight Saving,No,DesignDay
> ! <Environment:Design Day Data>, Max Dry-Bulb Temp {C}, Temp Range 
> {dC}, Temp Range Ind Type, Hum Ind Temp at Max {C}, Hum Ind 
> Type,Pressure {Pa}, Wind Direction {deg CW from N}, Wind Speed {m/s}, 
> Clearness, Rain, Snow
> ! <Environment:Design_Day_Misc>,DayOfYear,ASHRAE A Coeff,ASHRAE B 
> Coeff,ASHRAE C Coeff,Solar Constant-Annual Variation,Eq of Time 
> {minutes}, Solar Declination Angle {deg}
> Environment:Design Day Data,32.78,10.89,Default multipliers,23.33,Wet-
> Bulb,994330,213.,3.8,0.98,No ,No 
> Environment:Design_Day_Misc,202,1084.4,0.2082,0.1365,1.0,-6.23,20.6
> ! <Component Sizing Information>, Component Type, Component Name, 
> Input Field Description, Value
>  Component Sizing, COIL:GAS:HEATING, SPACE1-1 ZONE COIL, Nominal 
> Capacity of the Coil [W],   3024.7    
>  Component Sizing, COIL:GAS:HEATING, SPACE2-1 ZONE COIL, Nominal 
> Capacity of the Coil [W],   3463.0    
>  Component Sizing, BRANCH, VAV SYS 1 MAIN BRANCH, Maximum Branch Flow 
> Rate [m3/s],   1149.4    
>  Component Sizing, AIR PRIMARY LOOP, VAV SYS 1, Primary air design 
> volumetric flow rate [m3/s],   1149.4    
>  Component Sizing, COIL:DX:MULTISPEED:COOLINGEMPIRICAL, MAIN COOLING 
> COIL 1, rated air volume flow rate [m3/s],   1149.4    
>  Component Sizing, COIL:DX:MULTISPEED:COOLINGEMPIRICAL, MAIN COOLING 
> COIL 1, Rated Total Cooling Capacity (gross) [W],  0.24461E+08
>  Component Sizing, COIL:GAS:HEATING, MAIN HEATING COIL 1, Nominal 
> Capacity of the Coil [W],   0.0000    
> Environment:WarmupDays,  5
> Environment,CHICAGO ILLINOIS WINTER,DesignDay, 1/21, 
> 1/21,WinterDesignDay,  1,N/A,N/A,N/A,N/A,N/A,N/A
> Environment:Daylight Saving,No,DesignDay
> Environment:Design Day Data,-15.00,15.00,Default multipliers,-
> 21.11,Wet-Bulb,99782.,326.,11.6,0.00E+000,No ,No 
> Environment:Design_Day_Misc, 21,1229.0,0.1415,5.7310E-002,1.0,-11.15,-
> 20.1
> Environment:WarmupDays, 16
> Environment,CHICAGO IL USA TMY2-94846 WMO#=725300,WeatherRunPeriod, 
> 1/ 1, 1/31,SUNDAY, 31,UseWeatherFile,Yes,Yes,No ,Yes,Yes
> Environment:Daylight Saving,No,
> Environment:WarmupDays,  4
> End of Data
> 
> 
> 
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
> <mjwitte@g...> wrote:
> > The min flow rate only applies to chilled water coils.  My guess is 
> that the 
> > coil is way oversized for the airflow it is seeing.  The DX coil 
> controls 
> > always call the coil at full part-load in order to determine if 
> that is 
> > adequate to meet the current load.  If the airflow is too low 
> relative to the 
> > coil capacity, this may be producing the psychrometric errors 
> during these 
> > intial calls to the coil.  But this does not impact the results 
> necessarily.  I 
> > would suggest checking the autosized cooling coil capacity in the 
> eio output 
> > and then report the air volume flow rates to see if these seem 
> reasonable.
> > 
> > Mike
> > 
> > 
> > On 24 May 2005, at 11:58, Ali_Ajmi wrote:
> > 
> > > Mike my coil is DX:coil: Multispeed and it is outosized, where i 
> could find out
> > > the min actuated flow rate that you mentioned. Any how the file 
> is uploaded
> > > under name VAVEnvolpBuild_fivZone could you please have a look to 
> it.
> > > 
> > > Thanks in advance
> > > Ali
> > > 
> > > "Michael J. Witte" <mjwitte@g...> wrote:
> > > In some systems, the cooling coil model may generate such errors 
> during initial
> > > iterations at very low load conditions. Which cooling coil model 
> are you using?
> > > What is the min actuated flow rate in the controller for this 
> coil? If it is
> > > zero, try setting it to a small value, such as 0.00001. If this 
> does not help,
> > > please post the input file.
> > > 
> > > Mike
> > > 
> > > 
> > > On 23 May 2005, at 15:03, Ali_Ajmi wrote:
> > > 
> > > > Dear All,
> > > > 
> > > > I have created file of office building with five zone, this 
> file was made to
> > > > run without any errors or warning. The load was covered by 
> purchased air now I
> > > > replace it with VAV system. Now there some sort of error which 
> i could not
> > > > figure out their sources:
> > > > 
> > > > ** Warning ** Enthalpy out of range (PsyTsatFnHPb)
> > > > ** ~~~ ** Occurrence info=CHICAGO ILLINOIS SUMMER, 07/21 18:15 -
>  18:30
> > > > ** ~~~ ** Enthalpy=-699562.92274 Pressure= 99433.54 ** ~~~ ** 
> > > > Initial Resultant Temperature= -59.98 ** Warning ** Temperature 
> out of range
> > > > [-100. to 200.] (PsyPsatFnTemp) ** ~~~ ** Occurrence 
> info=CHICAGO ILLINOIS
> > > > SUMMER, 07/21 18:15 - 18:30 ** ~~~ ** Input Temperature=-711.86 
> ** Warning **
> > > > Temperature out of range [-100. to 200.] (PsyPsatFnTemp) ** ~~~ 
> ** Occurrence
> > > > info=CHICAGO ILLINOIS SUMMER, 07/21 18:15 - 18:30 ** ~~~ ** 
> Input
> > > > Temperature=-713.97 ** Warning ** Temperature out of range [-
> 100. to 200.]
> > > > (PsyPsatFnTemp) ** ~~~ ** Occurrence info=CHICAGO ILLINOIS 
> SUMMER, 07/21 18:15
> > > > - 18:30 ** ~~~ ** Input Temperature=-713.98 ** Warning ** 
> Calculated Relative
> > > > Humidity out of range (PsyRhFnTdbWPb) ** ~~~ ** Occurrence 
> info=CHICAGO
> > > > ILLINOIS SUMMER, 07/21 18:15 - 18:30 ** ~~~ ** Dry-Bulb= -
> 713.98 Humidity
> > > > Ratio= 1.000E-005 Calculated Relative Humidity (fraction)= 
> 940.37 ** ~~~ **
> > > > Relative Humidity being reset to 1.0 ** Warning ** Enthalpy out 
> of range
> > > > (PsyTsatFnHPb) ** ~~~ ** Occurrence info=CHICAGO ILLINOIS 
> SUMMER, 07/21 18:15
> > > > - 18:30 ** ~~~ ** Enthalpy=-699562.92274 Pressure= 99433.54 ** 
> ~~~ ** Initial
> > > > Resultant Temperature= -59.98 ** Warning ** Temperature out of 
> range [-100. to
> > > > 200.] (PsyPsatFnTemp) ** ~~~ ** Occurrence info=CHICAGO 
> ILLINOIS SUMMER, 07/21
> > > > 18:15 - 18:30 ** ~~~ ** Input Temperature=-711.86 ** Warning ** 
> Temperature
> > > > out of range [-100. to 200.] (PsyPsatFnTemp) ** ~~~ ** 
> Occurrence info=CHICAGO
> > > > ILLINOIS SUMMER, 07/21 18:15 - 18:30 ** ~~~ ** Input 
> Temperature=-713.97 **
> > > > Warning ** Enthalpy out of range (PsyTsatFnHPb) ** ~~~ ** 
> Occurrence
> > > > info=CHICAGO ILLINOIS SUMMER, 07/21 18:15 - 18:30 ** ~~~ **
> > > > Enthalpy=-699562.92274 Pressure= 99433.54 ** ~~~ ** Initial 
> Resultant
> > > > Temperature= -59.98 ** Warning ** Temperature out of range [-
> 100. to 200.]
> > > > (PsyPsatFnTemp) ** ~~~ ** Occurrence info=CHICAGO ILLINOIS 
> SUMMER, 07/21 18:15
> > > > - 18:30 ** ~~~ ** Input Temperature=-711.86 ** Warning ** 
> Calculated Relative
> > > > Humidity out of range (PsyRhFnTdbWPb) ** ~~~ ** Occurrence 
> info=CHICAGO
> > > > ILLINOIS SUMMER, 07/21 18:15 - 18:30 ** ~~~ ** Dry-Bulb= -
> 713.98 Humidity
> > > > Ratio= 1.000E-005 Calculated Relative Humidity (fraction)= 
> 940.37 ** ~~~ **
> > > > Relative Humidity being reset to 1.0 ** Warning ** Enthalpy out 
> of range
> > > > (PsyTsatFnHPb) ** ~~~ ** Occurrence info=CHICAGO ILLINOIS 
> SUMMER, 07/21 18:15
> > > > - 18:30 ** ~~~ ** Enthalpy=-699562.92274 Pressure= 99433.54 ** 
> ~~~ ** Initial
> > > > Resultant Temperature= -59.98 ** Warning ** Enthalpy out of 
> range
> > > > (PsyTsatFnHPb) ** ~~~ ** Occurrence info=CHICAGO ILLINOIS 
> SUMMER, 07/21 18:15
> > > > - 18:30 ** ~~~ ** Enthalpy=-699562.92274 Pressure= 99433.54 ** 
> ~~~ ** Initial
> > > > Resultant Temperature= -59.98 ** Warning ** Calculated Relative 
> Humidity out
> > > > of range (PsyRhFnTdbWPb) ** ~~~ ** Occurrence info=CHICAGO 
> ILLINOIS SUMMER,
> > > > 07/21 18:15 - 18:30 ** ~~~ ** Dry-Bulb= -713.98 Humidity Ratio= 
> 1.000E-005
> > > > Calculated Relative Humidity (fraction)= 940.37 ** ~~~ ** 
> Relative Humidity
> > > > being reset to 1.0 ** Warning ** Enthalpy out of range 
> (PsyTsatFnHPb) ** ~~~
> > > > ** Occurrence info=CHICAGO ILLINOIS SUMMER, 07/21 18:15 - 18:30 
> ** ~~~ **
> > > > Enthalpy=-699562.92274 Pressure= 99433.54 ** ~~~ ** Initial 
> Resultant
> > > > Temperature= -59.98 ** Warning ** Calculated Relative Humidity 
> out of range
> > > > (PsyRhFnTdbWPb) ** ~~~ ** Occurrence info=CHICAGO ILLINOIS 
> SUMMER, 07/21 18:15
> > > > - 18:30 ** ~~~ ** Dry-Bulb= -713.98 Humidity Ratio= 1.000E-005 
> Calculated
> > > > Relative Humidity (fraction)= 940.37 ** ~~~ ** Relative 
> Humidity being reset
> > > > to 1.0 ** Warning ** Calculated Relative Humidity out of range 
> (PsyRhFnTdbWPb)
> > > > ** ~~~ ** Occurrence info=CHICAGO ILLINOIS SUMMER, 07/21 18:15 -
>  18:30 ** ~~~
> > > > ** Dry-Bulb= -713.98 Humidity Ratio= 1.000E-005 Calculated 
> Relative Humidity
> > > > (fraction)= 940.37 ** ~~~ ** Relative Humidity being reset to 
> 1.0 ** Warning
> > > > ** Calculated Relative Humidity out of range (PsyRhFnTdbWPb) ** 
> ~~~ **
> > > > Occurrence info=CHICAGO ILLINOIS SUMMER, 07/21 18:15 - 18:30 ** 
> ~~~ **
> > > > Dry-Bulb= -713.98 Humidity Ratio= 1.000E-005 Calculated 
> Relative Humidity
> > > > (fraction)= 940.37 ** ~~~ ** Relative Humidity being reset to 
> 1.0
> > > > ************* Psychrometric Error Summary ************* 
> Routine - Number of
> > > > errors ************* PsyTdpFnTdbTwbPb-0 ************* 
> PsyRhFnTdbWPb-3970
> > > > ************* PsyTwbFnTdbWPb-0 ************* PsyVFnTdbWPb-0 
> *************
> > > > PsyWFnTdpPb-0 ************* PsyWFnTdbH-0 ************* 
> PsyWFnTdbTwbPb-0
> > > > ************* PsyWFnTdbRhPb-0 ************* PsyPsatFnTemp-960 
> *************
> > > > PsyTsatFnHPb-7940 ************* PsyTsatFnPb-0 ************* 
> tp12c0-0
> > > > ************* tp12c1-0 ************* tp12h0-0 ************* 
> tp12h1-0
> > > > ************* freeze-0 ************* EnergyPlus Completed 
> Successfully-- 21
> > > > Warning; 0 Severe Errors; Elapsed Time=00hr 15min 8.00sec
> > > > 
> > > > Best Regards
> > > > Ali 
> > > > 
> > > > 
> > > > 
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> > > 
> > > ========================================================
> > > Michael J. Witte, GARD Analytics, Inc.
> > > EnergyPlus Testing and Support 
> > > EnergyPlus-Support@g...
> > > 
> > > 
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> > > 
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> > ========================================================
> > Michael J. Witte, GARD Analytics, Inc.
> > EnergyPlus Testing and Support      
> > EnergyPlus-Support@g...
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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References:
- Re: [EnergyPlus_Support] Warnings
  - From: Michael J. Witte
- [EnergyPlus_Support] Re: Warnings
  - From: marieodeline
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