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Re: [EnergyPlus_Support] Warnings

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Warnings
From: "Michael J. Witte" <mjwitte@xxxxxxxx>
Date: Thu, 2 Jun 2005 12:48:44 -0500
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1.  The user has the option of specifying values for the flow rates for zones 
and systems.  The user also has the option of specifying sizing factors.  The 
"User" flow rates include the impact of these inputs.  The "Calculated" flow 
rates are the computed flow rates ignoring these user inputs.  The "User" 
values are used in the simulation.

2.  Referring the the uploaded file from 23 May (VAVEnvlopBuild_fivZone.idf):
a)  In the SIZING PARAMETERS object, the "Time Steps in Averaging Window" field 
is set to one which means that sizing is based on the load of a single time 
step, which is 15 minutes in this idf.
b)  The zones are all peaking at setback recovery time when the thermostat 
setting changes.
c)  To solve this, use a constant thermostat setting for the summer and winter 
design day day types, OR make the averaging window longer, OR both.

3.  What version are you running?  When if run VAVEnvlopBuild_fivZone.idf with 
version 1.2.2.030, it does not show the same coil capacities for these zones.



On 31 May 2005, at 16:14, Ali_Ajmi wrote:

> Dear Mike,
> I guess as per the output results that your predication of the error source was
> correct, the maximum air flow rate was very small relative to the coil capacity.
> How to ratify this problem Zone and component sizing from the output file are
> listed below. Mike there some more questions regarding the below outputs: 1) In
> the zone sizing what is the different between Calc Des Air Flow Rate and UserDes
> Air Flow Rate? 2) Also in the zone sizing Time of Peak are identical for the
> summer for the different zones, is this sensible? 3)  Nominal capacity of the
> coil in the North Zone and South are identical, is this sensible?
> 
> ! <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 NORTH, Cooling,   13221.    ,   1.4219    ,   1.4219    ,
>  CHICAGO ILLINOIS SUMMER, 21:15:00,   26.190    ,  0.14507E-01 Zone Sizing, ZONE
>  NORTH, Heating,   23662.    ,  0.65447    ,  0.65447    , CHICAGO ILLINOIS
>  WINTER, 06:15:00,  -21.111    ,  0.57882E-03 Zone Sizing, ZONE WEST, Cooling,  
>  10274.    ,   1.1047    ,   1.1047    , CHICAGO ILLINOIS SUMMER, 21:15:00,  
>  26.190    ,  0.14507E-01 Zone Sizing, ZONE WEST, Heating,   31693.    , 
>  0.87898    ,  0.87898    , CHICAGO ILLINOIS WINTER, 06:15:00,  -21.111    , 
>  0.57882E-03 Zone Sizing, ZONE EAST, Cooling,   10307.    ,   1.1084    ,  
>  1.1084    , CHICAGO ILLINOIS SUMMER, 21:15:00,   26.190    ,  0.14507E-01 Zone
>  Sizing, ZONE EAST, Heating,   32980.    ,  0.91481    ,  0.91481    , CHICAGO
>  ILLINOIS WINTER, 06:15:00,  -21.111    ,  0.57882E-03 Zone Sizing, ZONE SOUTH,
>  Cooling,   12383.    ,   1.3294    ,   1.3294    , CHICAGO ILLINOIS SUMMER,
>  21:15:00,   26.190    ,  0.14507E-01 Zone Sizing, ZONE SOUTH, Heating,   23662.
>     ,  0.65447    ,  0.65447    , CHICAGO ILLINOIS WINTER, 06:15:00,  -21.111   
>  ,  0.57882E-03 Zone Sizing, ZONE INTERIOR, Cooling,   12237.    ,   1.3131    ,
>    1.3131    , CHICAGO ILLINOIS SUMMER, 21:15:00,   26.190    ,  0.14507E-01
>  Zone Sizing, ZONE INTERIOR, Heating,   18589.    ,  0.51343    ,  0.51343    ,
>  CHICAGO ILLINOIS WINTER, 06:15:00,  -21.111    ,  0.57882E-03
> ! <System Sizing Information>, System Name, Field Description, Value
>  System Sizing, VAV SYS 1, Calculated cooling design air flow rate [m3/s],  
>  6.2775    System Sizing, VAV SYS 1, Calculated heating design air flow rate
>  [m3/s],   3.6162    
> ! <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, SINGLE DUCT:VAV:REHEAT, ZONE NORTH VAV REHEAT, Maximum air
>  flow rate [m3/s],   1.4219    Component Sizing, COIL:GAS:HEATING, ZONE NORTH
>  ZONE COIL, Nominal Capacity of the Coil [W],   24962.    Component Sizing,
>  SINGLE DUCT:VAV:REHEAT, ZONE WEST VAV REHEAT, Maximum air flow rate [m3/s],  
>  1.1047    Component Sizing, COIL:GAS:HEATING, ZONE WEST ZONE COIL, Nominal
>  Capacity of the Coil [W],   33525.    Component Sizing, SINGLE DUCT:VAV:REHEAT,
>  ZONE EAST VAV REHEAT, Maximum air flow rate [m3/s],   1.1084    Component
>  Sizing, COIL:GAS:HEATING, ZONE EAST ZONE COIL, Nominal Capacity of the Coil
>  [W],   34891.    Component Sizing, SINGLE DUCT:VAV:REHEAT, ZONE SOUTH VAV
>  REHEAT, Maximum air flow rate [m3/s],   1.3294    Component Sizing,
>  COIL:GAS:HEATING, ZONE SOUTH ZONE COIL, Nominal Capacity of the Coil [W],  
>  24962.    Component Sizing, SINGLE DUCT:VAV:REHEAT, ZONE INTERIOR VAV REHEAT,
>  Maximum air flow rate [m3/s],   1.3131    Component Sizing, COIL:GAS:HEATING,
>  ZONE INTERIOR ZONE COIL, Nominal Capacity of the Coil [W],   19582.   
>  Component Sizing, BRANCH, VAV SYS 1 MAIN BRANCH, Maximum Branch Flow Rate
>  [m3/s],   6.2775    Component Sizing, AIR PRIMARY LOOP, VAV SYS 1, Primary air
>  design volumetric flow rate [m3/s],   6.2775    Component Sizing,
>  FAN:SIMPLE:VARIABLEVOLUME, RETURN FAN 1, Max Flow Rate [m3/s],   6.2775   
>  Component Sizing, FAN:SIMPLE:VARIABLEVOLUME, RETURN FAN 1, Min Flow Rate
>  [m3/s],   1.8833    Component Sizing, CONTROLLER:OUTSIDE AIR, OA CONTROLLER 1,
>  maximum outside air flow rate [m3/s],   6.2775    Component Sizing,
>  CONTROLLER:OUTSIDE AIR, OA CONTROLLER 1, minimum outside air flow rate [m3/s], 
>  0.43982    Component Sizing, COIL:DX:MULTISPEED:COOLINGEMPIRICAL, MAIN COOLING
>  COIL 1, rated air volume flow rate [m3/s],   6.2775    Component Sizing,
>  COIL:DX:MULTISPEED:COOLINGEMPIRICAL, MAIN COOLING COIL 1, Rated Total Cooling
>  Capacity (gross) [W],  0.10392E+06 Component Sizing, COIL:GAS:HEATING, MAIN
>  HEATING COIL 1, Nominal Capacity of the Coil [W],   17153.    Component Sizing,
>  FAN:SIMPLE:VARIABLEVOLUME, SUPPLY FAN 1, Max Flow Rate [m3/s],   6.2775   
>  Component Sizing, FAN:SIMPLE:VARIABLEVOLUME, SUPPLY FAN 1, Min Flow Rate
>  [m3/s],   1.8833    
> E
> Regards
> Ali
> 
> "Michael J. Witte" <mjwitte@xxxxxxxx> 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" 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@xxxxxxxx
> > 
> > 
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> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support 
> EnergyPlus-Support@xxxxxxxx
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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
- Re: [EnergyPlus_Support] Warnings
  - From: Ali_Ajmi
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