[Equest-users] Purchased Heat
Dakota Kelley
dakotak at teliospc.com
Mon Aug 17 14:02:17 PDT 2009
Seun,
Good question, and I’m copying the user list to complete my original response to Rick.
You do not need to have a boiler or chiller as long as you have the appropriate meters created and assigned to your loops. The meter, in effect, becomes the primary equipment for its loop.
However, you do have to have a pump created for each loop. If the proposed design does not include pumps downstream of the meter, you may want to put them on a separate electric meter so that you can back the energy out of the totals. Or, if they’re the only pumps in the project, you can simply neglect the “pump/aux” end use from EM1’s results.
I have attached two screen shots from a sample project to demonstrate the above. “Purchased 01” is the Water-Side tab with the appropriate meters and pumps assigned to each loop, and “Purchased 02” shows the corresponding Utility & Economics tab. This is the bare minimum setup for the simulation to run without errors.
Thanks,
DAKOTA KELLEY
Project Designer
Office: 214-744-6199
Cell: 214-280-3825
Fax: 214-744-0770
http://www.teliospc.com <http://www.teliospc.com/> 3535 Travis St. Suite 115
dakotak at teliospc.com <mailto:dakotak at teliospc.com> Dallas, TX 75204
| MEP ENGINEERING · ENERGY MODELING · LEED CONSULTATION · COMMISSIONING |
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And may contain information that is privileged, confidential and exempt from disclosure under applicable law. If you
are not the intended recipient, please email the sender immediately, and delete this email from all computers. Any
distribution or other use is strictly prohibited. Copyright © 2009 Telios Corporation.
From: Seun Odukomaiya [mailto:sodukomaiya at laceindy.com]
Sent: Monday, August 17, 2009 2:42 PM
To: Dakota Kelley
Subject: Purchased Heating and Cooling in eQuest
Dakota,
I read your reply to Rick concerning modeling purchased steam in eQuest. I have a similar building for which I need to model purchased steam and chilled water. I have followed the procedures that you detailed in your email to Rick but have a couple additional questions. When I create the Steam loop, do I have a add a boiler to the loop? Will eQuest perform the simulation if the steam loop does not have an attached boiler? And for the purchased chilled water, do I have to attach a chiller to the chilled water loop? When I tried to run the simulation with a chilled water loop and no chiller, I get a message saying that the simulation was stopped due to errors. When I add a chiller to the loop, however, it seems to run the complete simulation. Thank you in advance for your help.
Seun Odukomaiya, LEED AP - Mechanical Engineer
L'Acquis Consulting Engineers
280 East 96th Street, Suite 280
Indianapolis, IN 46240
voice: (317) 706-2075
fax: (317) 706-2076
email: sodukomaiya at laceindy.com <mailto:amaue at laceindy.com>
web: www.laceindy.com
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From: Dakota Kelley
Sent: Friday, August 14, 2009 3:09 PM
To: 'YinRic'
Cc: Equest User
Subject: RE: [Equest-users] Purchased Heat
Rick,
I wouldn’t go with no heating; you can model this scenario directly in eQUEST:
· Make sure you have your steam loop created, then create a steam meter under “Utility & Economics”
· Assign the meter to your steam loop when prompted
· Create a utility rate of type “steam” and make sure it is set to serve your steam meter
· Set up block charges for different times of the year to create your steam rate. For the three months that have a fixed rate, you could create a block with $0/unit and define a minimum $5,000 charge (steam rate properties…Min/Max Charges tab…Fixed Chrgs ($/mon) column). Set the min to $0 or whatever it should be for the other 9 months. Note that for a steam meter, you can define the Btu/billing unit under the steam meter’s Properties/Basic Specifications tab.
Creating the rate schedule will be the hardest part, but it’s not that difficult. The process is also well-documented in Volume 2 of the supporting documentation. The way I would do it is:
· Create a block schedule of type “flag” – this will define when your various blocks are active/inactive
· Create your blocks as needed; you’ll only have two if the rest of the year follows a single rate schedule
· On each block’s Basic Specifications tab, apply the block schedule you created and give each block a flag value
· If necessary, adjust your block schedule to ensure it corresponds to the flag values you assigned to the blocks (you will probably have thought this out when creating the schedule, however)
To ensure you set it up correctly, you can use the ES-E and ES-F reports to inspect your steam rate’s monthly billing. Feel free to contact me directly if you have more questions about the above.
Thanks,
DAKOTA KELLEY
Project Designer
Office: 214-744-6199
Cell: 214-280-3825
Fax: 214-744-0770
http://www.teliospc.com <http://www.teliospc.com/> 3535 Travis St. Suite 115
dakotak at teliospc.com <mailto:dakotak at teliospc.com> Dallas, TX 75204
| MEP ENGINEERING · ENERGY MODELING · LEED CONSULTATION · COMMISSIONING |
CONFIDENTIALITY NOTICE: This email is intended only for the use of the individual or entity to which it is addressed,
And may contain information that is privileged, confidential and exempt from disclosure under applicable law. If you
are not the intended recipient, please email the sender immediately, and delete this email from all computers. Any
distribution or other use is strictly prohibited. Copyright © 2009 Telios Corporation.
From: YinRic [mailto:cesseric at hotmail.com]
Sent: Friday, August 14, 2009 12:12 AM
To: Equest User
Subject: [Equest-users] Purchased Heat
Hi,
In a project to go for LEED, in winter, the heat source is steam purchased from public utility company with fixed rate, say, $5,000/month in spite of the real heating demand, how to simulate this in Equest? ASHRAE 90.1-2004 stated that "For systems using purchased hot water or steam, hot water or steam costs shall be based on actual utility rates, and on-site boilers shall not be modeled in the baseline building design." Is it feasible to choose "no heating" in the proposed case and do some simple calculation instead, say, $5,000/month*3 month=$15,000, to generate a result?
Any comments are welcome. Thanks.
Rick, PE, LEED AP
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