[Equest-users] How to set the COP of a chiller as constant in eQuest?

[Nick Caton]

This is something I haven't ever fully resolved for myself actually... eQuest contains a set of DOE-2.2 manual volumes, found under the eQuest "Help" menu.
[cid:image005.png at 01CE3F4B.993AAEA0]

I believe the first 4 volumes are the "core" DOE2.2 volumes, and the other volumes have been appended over time as eQuest/DOE2 have developed in more recent years.  I'm not clear on whether these in sum are any more or less "complete" than past or present manuals for the underlying DOE2 simulation engine itself.  I am pretty sure some parts of this are compiled by & for eQuest specifically (Volume 5: Compliance Analysis in particular jumps to mind).

More specifically to Esmireta's follow up query, you can find the entry I cited on Chiller Energy Consumption, and explore the associated inputs further, in a few ways:

First, navigate to "DOE-2 Help" from the Help context menu.
[cid:image003.png at 01CE3F47.FE73C170]
>From here, you can navigate to the previously appended chiller energy consumption entry.  Here's a better citation for those who aren't seeing images in my emails:  Volume 2 > HVAC Components > CHILLER > Chiller Energy Consumption.  You can also read up on all the associated BDL inputs by highlighting the branch elements following in the tree view:
[cid:image002.png at 01CE3F47.2ADDA600]

Second, while working in eQuest and particularly after the wizards, you can also right-click most input fields to pull up a context-sensitive index of sorts to lead you to appropriate entries in the DOE2 manuals - this is the primary way I access & navigate the supporting documentation in practice:
[cid:image004.png at 01CE3F4A.293FF430]

Regards,

~Nick



[cid:489575314 at 22072009-0ABB]

NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617
www.smithboucher.com

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Joe Huang
Sent: Monday, April 22, 2013 10:40 AM
To: Esmireta
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] How to set the COP of a chiller as constant in eQuest?

I was referring to the DOE-2 Supplement, Version 2.1E, produced by LBNL in 1993 (LBL-34947).  I have not looked at the help function of eQUEST, so I can't tell how detailed is it.

Joe


Joe Huang

White Box Technologies, Inc.

346 Rheem Blvd., Suite 108D

Moraga CA 94556

yjhuang at whiteboxtechnologies.com<mailto:yjhuang at whiteboxtechnologies.com>

www.whiteboxtechnologies.com<http://www.whiteboxtechnologies.com>

(o) (925)388-0265

(c) (510)928-2683

"building energy simulations at your fingertips"

On 4/21/2013 9:49 PM, Esmireta wrote:
Hi Joe,
Thanks for your reply!
Is the DOE-2.2 manual the DOE help in the eQuest?
Esmi





At 2013-04-18 03:17:00,"Joe Huang" <yjhuang at whiteboxtechnologies.com><mailto:yjhuang at whiteboxtechnologies.com> wrote:

Do you not have a copy of a DOE-2.2 or DOE-2.1E manual?  That would make it hard to understand how DOE-2 works.
DOE-2 has many performance curves, depending on the type of equipment. The EIR-FT curves are either bi-linear or bi-quadratic functions of the entering wetbulb and outdoor drybulb temperature.  The EIR-FPLR curves can be linear, quadratic, or cubic functions of the Part Load Ratio (PLR).

By the way,what I said yesterday was in reference to packaged SYSTEMS.  If your model contains a PLANT model with a Chiller, then
the keywords for the chiller performance curves change somewhat.

Joe


Joe Huang

White Box Technologies, Inc.

346 Rheem Blvd., Suite 108D

Moraga CA 94556

yjhuang at whiteboxtechnologies.com<mailto:yjhuang at whiteboxtechnologies.com>

www.whiteboxtechnologies.com<http://www.whiteboxtechnologies.com>

(o) (925)388-0265

(c) (510)928-2683

"building energy simulations at your fingertips"

On 4/16/2013 11:09 PM, Esmireta wrote:
Hi Joe,
In the simulation of a district cooling system, the guidance requires a virtual plant with a constant average efficiency.
In the DOE curves, how can I know the meaning of the equation and the coefficients in it? It seems there is no useful information in the DOE help.
Thanks!
Esmi





At 2013-04-17 10:35:35,"Joe Huang" <yjhuang at whiteboxtechnologies.com><mailto:yjhuang at whiteboxtechnologies.com> wrote:

DOE-2 modifies the COOL-EIR using several curves COOL-EIR-FT as a function of outdoor conditions and COOL-EIR-FPLR as a function of the Part Load Ratio. I suppose you could set those to be constant. Another way would be to just take the Cooling Load from the SS-D report and divide that by your constant COP.  But my question would be, why do you want to do that ?

Joe


Joe Huang

White Box Technologies, Inc.

346 Rheem Blvd., Suite 108D

Moraga CA 94556

yjhuang at whiteboxtechnologies.com<mailto:yjhuang at whiteboxtechnologies.com>

www.whiteboxtechnologies.com<http://www.whiteboxtechnologies.com>

(o) (925)388-0265

(c) (510)928-2683

"building energy simulations at your fingertips"

On 4/16/2013 6:55 PM, Esmireta wrote:
Dear all,
I wonder how to set the COP of a chiller as constant? after I set the chiller type, the electric input ratio type is determined, which means the self-made constant curve cannot be input.
Thanks!
Esmi






_______________________________________________

Equest-users mailing list

http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org

To unsubscribe from this mailing list send  a blank message to EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG<mailto:EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG>






-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20130422/ec87cc1c/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 1459 bytes
Desc: image001.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20130422/ec87cc1c/attachment-0002.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.png
Type: image/png
Size: 145417 bytes
Desc: image002.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20130422/ec87cc1c/attachment-0008.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.png
Type: image/png
Size: 25150 bytes
Desc: image003.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20130422/ec87cc1c/attachment-0009.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image004.png
Type: image/png
Size: 62262 bytes
Desc: image004.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20130422/ec87cc1c/attachment-0010.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image005.png
Type: image/png
Size: 19377 bytes
Desc: image005.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20130422/ec87cc1c/attachment-0011.png>