RE: [EnergyPlus_Support] Absorption chiller model

["Michael J. Witte" <mjwitte@xxxxxxxx>]

There is a bug in the CHILLLER:ABSORPTION model.  It does not pass its flow 
requirements for autosizing the condenser loop.  You will need to manually size 
the condenser loop flow rates.  This should not affect the simulation results, 
just the autosizing of the condenser loop.

Mike


On 26 Nov 2007 at 15:14, Jun Calixihan wrote:

> Hello EnergyPlus Support!
> 
> 
> 
> Just want to confirm my findings on doing annual simulation on absorption
> chillers in E+ for my modeling project.  I tried several options to avoid
> the zero volume flow rate in the chiller-condenser water loop (no clear
> statement on this in the Input-Output reference and Engineering reference). The
> one that worked is adding Purchased Cooling into the cooling supply side
> branches.  Is this finding correct?  Does this mean that the Purchased Cooling
> branch represent the purchased steam needed by the absorption chiller?
> 
> 
> 
> Thanks for your help!
> 
> Jun
> 
> 
> 
> 
> 
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Jun Calixihan
> Sent: Thursday, November 22, 2007 6:16 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Absorption chiller model
> 
> 
> 
> Hi!
> 
> Need help identifying source of error in my model for absorption chiller.
> Below is the error. I tried editing the condenser pump, chiller parameters,
> equipment sizes, loop temperatures, etc. but can't seem to arrive at the source
> of error. I uploaded the idf file named AbsorptionChillerModified.idf
> 
> Thank you in advance!
> 
> Best Regards,
> 
> Jun
> 
> ** Warning ** SizeCondDemandSide: Calculated Plant Sizing Design Volume Flow
> Rate=[0.00] is too small. Set to 0.0
> 
> ** ~~~ ** ..occurs for Condenser Loop=CHILLED WATER LOOP CONDENSER
> WATER LOOP
> 
> ** Warning ** SizeCondSupplySide: Calculated Plant Sizing Design Volume
> Flow Rate=[0.00] is too small. Set to 0.0
> 
> ** ~~~ ** ..occurs for Condenser Loop=CHILLED WATER LOOP CONDENSER
> WATER LOOP
> 
> ** Warning ** SizePump: Calculated Pump Nominal Volume Flow Rate=[0.00]
> is too small. Set to 0.0
> 
> ** ~~~ ** ..occurs for Pump=CHILLED WATER LOOP CNDW SUPPLY PUMP
> 
> ** Warning ** Check input. Pump nominal power or motor efficiency is set
> to 0, for pump=CHILLED WATER LOOP CNDW SUPPLY PUMP
> 
> ** Warning ** Check input. Pump nominal volumetric flow rate is set or
> calculated = 0, for pump=CHILLED WATER LOOP CNDW SUPPLY PUMP
> 
> ** Severe ** CalcBLASTAbsorberModel: Condenser flow = 0, for
> Absorber=CHILLER
> 
> ** Fatal ** Program Terminates due to previous error condition.
> 
> ...Summary of Errors that led to program termination:
> 
> ..... Reference severe error count=1
> 
> ..... Last severe error=CalcBLASTAbsorberModel: Condenser flow = 0, for
> Absorber=CHILLER
> 
> ************* Fatal error -- final processing. More error messages may
> appear.
> 
> ************* 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.
> 
> ************* EnergyPlus Terminated--Fatal Error Detected. 8 Warning; 1
> Severe Errors; Elapsed Time=00hr 00min 2.91sec
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
> 
> 
> [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.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the
> Documentation link and press the "search" button.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 


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





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