[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [EnergyPlus_Support] Warnings

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Warnings
From: Ali_Ajmi <ajmi70kw@xxxxxxxxxxx>
Date: Tue, 31 May 2005 16:14:52 +0100 (BST)
Comment: DomainKeys? See http://antispam.yahoo.com/domainkeys
Delivered-to: linda:lawrie.com@xxxxxxxxxxxxxxx
Delivered-to: mailing list EnergyPlus_Support@xxxxxxxxxxxxxxx
Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=lima; d=yahoogroups.com; b=fdOxnGJSOOfs8opUf8sl5HA8hHgFMDrcvXRatMGg5VcFWy+EQIC6E75r5aDNV41Uo2+neMgIw5YnGPEavSi4e8CdYiRQPg3LIYKfxNzTwIQDrxYbGBEoCl4C0NbgxuzO;
In-reply-to: <429623BD.11327.21152DF5@localhost>
List-id: <EnergyPlus_Support.yahoogroups.com>
List-unsubscribe: <mailto:EnergyPlus_Support-unsubscribe@yahoogroups.com>
Mailing-list: list EnergyPlus_Support@xxxxxxxxxxxxxxx; contact EnergyPlus_Support-owner@xxxxxxxxxxxxxxx
Reply-to: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sender: EnergyPlus_Support@xxxxxxxxxxxxxxx
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 
> > 
> > 
> > 
> > ---------------------------------
> > Yahoo! Messenger - want a free & easy way to contact your friends online? 
> > 
> > [Non-text portions of this message have been removed]
> > 
> > 
> > 
> > The primary EnergyPlus web site is found at:
> > http://www.energyplus.gov
> > 
> > The group web site is:
> > http://groups.yahoo.com/group/EnergyPlus_Support/
> > 
> > Attachments are not allowed -- please post any files to the appropriate folder
> > in the Files area of the Support Web Site.
> > 
> > Yahoo! Groups Links
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> 
> 
> 
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support 
> EnergyPlus-Support@xxxxxxxx
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
> 
> 
> ---------------------------------
> Yahoo! Messenger NEW - crystal clear PC to PCcalling worldwide with voicemail
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support 
EnergyPlus-Support@xxxxxxxx




The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.

Yahoo! Groups Links








		
---------------------------------
Yahoo! Messenger NEW - crystal clear PC to PCcalling worldwide with voicemail

[Non-text portions of this message have been removed]



The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.
 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/
Follow-Ups:
- Re: [EnergyPlus_Support] Warnings
  - From: Michael J. Witte
References:
- Re: [EnergyPlus_Support] Warnings
  - From: Michael J. Witte
Prev by Date: Re: [EnergyPlus_Support] Re: Comfort calculation (PMV)
Next by Date: Re: [EnergyPlus_Support] WindowShadingControl + Schedule + ONifHighZoneAirTemp
Previous by thread: Re: [EnergyPlus_Support] Warnings
Next by thread: Re: [EnergyPlus_Support] Warnings
Index(es):
- Date
- Thread