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RE: [EnergyPlus_Support] EnergyPlus Capabilities on Renewable/Efficient Energy

Thanks Mike for the reply!

 

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 Michael J. Witte
Sent: Friday, November 09, 2007 6:07 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] EnergyPlus Capabilities on
Renewable/Efficient Energy

 

EnergyPlus can model absorption chillers, but they are not currently
connected 
to hot water or heat recovery. They only consume purchased steam. So, you 
will need to do some postprocessing and perhaps re-run the simulation with
some 
adjustments in order to match up the absorption chiller energy use with the 
waste heat from the fuel cells.

I am not sure what you mean by cooling tower water heat recovery. If you
mean 
taking hear the warm condenser water from the chillers instead of rejecting
it 
through cooling towers, then yes, EnergyPlus has a couple of different ways
to 
model that. See example file HeatRecoveryElectricChiller.idf for one
approach.

Mike

On 5 Nov 2007 at 19:21, Jun Calixihan wrote:

> Hello again!
> 
> 
> 
> I found that it's possible to model absorption chillers and fuel cells on
> the EnergyPlus documentation. Any advise on cooling tower water heat
> recovery would be helpful.
> 
> 
> 
> Thanks!
> 
> Jun
> 
> 
> 
> 
> 
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx
<mailto:EnergyPlus_Support%40yahoogroups.com> 
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx
<mailto:EnergyPlus_Support%40yahoogroups.com> ] On Behalf Of Jun Calixihan
> Sent: Monday, November 05, 2007 2:19 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
<mailto:EnergyPlus_Support%40yahoogroups.com> 
> Subject: [EnergyPlus_Support] EnergyPlus Capabilities on
Renewable/Efficient
> Energy
> 
> 
> 
> Hi!
> 
> I'm new to EnergyPlus although I have been using the commercially
available
> interfaces for 3 months now. I'm planning to study doing models in txt
files to
> access more EnergyPlus capabilities but don't know yet if I should devote
office
> time to learning editing idf files. So please excuse my inexperience. 
> 
> Aside from air-to-air heat recovery, is EnergyPlus capable of modeling
> cooling tower water heat recovery? Can I model absorption refrigeration if
> given the amount of heat available for the absorption process? Can fuel
> cells be modeled together with heat recovery of its waste heat? Say I have
> a natural gas-fuelled fuel cell with certain amount of kJ of heat for
every kW
> of electric power generated. The electric power will be used to augment
> grid-electricity to power the rooms, the recovered fuel cell heat will be
used
> for absorption refrigeration that will power the chillers for room
cooling. I'm
> interested in the hourly energy output of these renewable/efficient energy
> sources.
> 
> Thank you in advance for your advise!
> 
> Best Regards,
> 
> Jun
> 
> [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 <mailto:EnergyPlus-Support%40gard.com> 

 



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



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