Re: [EnergyPlus_Support] Pumps

[Edwin Lee <leeed2001@xxxxxxxxx>]

I imagine you could use a single condenser pump which has the capacity of your two pumps, then use EMS logic to set the pump capacity to either 0.5 or 1.0, depending on how many pumps (1 or 2) should actually be running.  I haven't thought deeply about this, but it may be worth a shot.

• You would set the pump flow based on chiller operation, however I'm not sure if these calculations will occur too deep in the simulation to be useful.
• If that is too deep, perhaps you could mine some infromation from other parts of the simulation (zone load for this time step), predict the control strategy for the chillers (assume it will either be 1 or 2 for this pass), then use this to set the pump's available flow.  You wouldn't be basing it directly off of the chiller operation, rather indirectly...

I'll try to come up with some other ideas as well, but let me know what you think about that.  Others here likely have better ideas too.

Edwin

On Fri, Aug 3, 2012 at 10:30 AM, Carolina Galeazzi <caro_poa@xxxxxxxxxxxx> wrote:

 

Hi Edwin,

I am trying to model the ASHRAE baseline, where I have a VAV system with two screw chillers and 1 cooling tower. I should have 2 chilled water pumps, and 2 condenser water pumps. The templates allows me to do 1 pump per chiller, but I didn't find an option for the condenser water. Is there a way to add a constant pump to this system?

Thank you

Carolina

 

De: Edwin Lee <leeed2001@xxxxxxxxx>
Para: EnergyPlus_Support@xxxxxxxxxxxxxxx
Enviadas: Sexta-feira, 3 de Agosto de 2012 12:02
Assunto: Re: [EnergyPlus_Support] Pumps

 

Could you provide a little more detail?  A sketch of the system you are trying to model would be helpful, with that I could try to provide some help.

Edwin

On Fri, Aug 3, 2012 at 9:57 AM, Carolina Galeazzi <caro_poa@xxxxxxxxxxxx> wrote:

 

Dear All,

 

How can model ' each chiller with separate condenser water and chilled water pumps interlocked to operate with the associated chiller' (App. G ASHRAE)?

I am trying to input a condenser water constant pump manually but I get fatal errors and cannot continue.

 

Any tips?

Thank you!

Carolina

 

--

Edwin Lee

Doctoral Candidate, Oklahoma State University

ASHRAE Student Member, Former ASHRAE OSU Student Branch President

Office: ATRC 303: 405-744-3727

--

Edwin Lee

Doctoral Candidate, Oklahoma State University

ASHRAE Student Member, Former ASHRAE OSU Student Branch President

Office: ATRC 303: 405-744-3727

__._,_.___

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to 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 currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.

Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___