Multistack (DHRC) Dedicated Heat Recovery Chiller

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Can anyone guide me as to how to go about modeling a Multistack (DHRC)
Dedicated Heat Recovery Chiller in eQUEST as a proposed EEM?

Thank you,

*R. Aaron Derr, PE, LEED AP, CEM, GBE*

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Aaron,

You will need to model it in the detailed mode, and use two models to
compare the savings rather than EEM or parametric runs. You will need
to make sure the HW loop is set to operate at or below the Design-Cond-T
setting. Normally there is a back up chiller that operates when there
is not a simultaneous heating and cooling load so you will need to
create a control scheme as well. Some sample inputs are below

Byron D. Burns

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I have nothing to add to Byron's very thorough response except that in newer versions of eQUEST (I think versions 3.5 and above) you can select an inp file as a parametric run.

Byron - great series of images. Would you mind sharing your inp file?

Vikram Sami, LEED AP BD+C

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Byron,

Thank you for the information. I will try what you are suggesting as soon
as I complete my base model.

Regarding that, my base model runs with no errors, and when I look at the
results, my electrical usage profile is very similar to what I graphed from
utility information that I have. However, the gas usage is about 2X what
they have been using according to utility information. The only usages for
gas that I have is water heating and space heating. The water heating
contributes very little to the total. Where in the reports can I see what
contribution each element of my envelope is having to the total? I am
assuming that I may have a wall, roof, or window definition incorrect but I
do not see anything obvious on the inputs.

Thoughts anyone?

Respectfully,

*R. Aaron Derr, PE, LEED AP, CEM, GBE*

------------------------------

*From:* Byron Burns [mailto:B.Burns at ha-inc.com]
*Sent:* Thursday, February 07, 2013 9:35 AM
*To:* Aaron Derr
*Cc:* equest-users at lists.onebuilding.org
*Subject:* RE: [Equest-users] Multistack (DHRC) Dedicated Heat Recovery
Chiller

Aaron,

You will need to model it in the detailed mode, and use two models to
compare the savings rather than EEM or parametric runs. You will need to
make sure the HW loop is set to operate at or below the Design-Cond-T
setting. Normally there is a back up chiller that operates when there is
not a simultaneous heating and cooling load so you will need to create a
control scheme as well. Some sample inputs are below

*Byron D. Burns*

*From:* equest-users-bounces at lists.onebuilding.org [mailto:
equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Aaron Derr
*Sent:* Wednesday, February 06, 2013 5:45 PM
*To:* equest-users at lists.onebuilding.org
*Subject:* [Equest-users] Multistack (DHRC) Dedicated Heat Recovery Chiller

Can anyone guide me as to how to go about modeling a Multistack (DHRC)
Dedicated Heat Recovery Chiller in eQUEST as a proposed EEM?

Thank you,

*R. Aaron Derr, PE, LEED AP, CEM, GBE*

aderr's picture
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Joined: 2012-11-28
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I have attached a list of the eQuest reports. You want look at the LS-B report in the .SIM file. This gives all of the space peak load components broken down by walls, windows, etc.

?
Daniel Knapp, PhD, LEED? AP O+M

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Any idea why an .inp file would be empty? I have a base project that I
started and did a ?save as? to creaet a second copy to experiment with.
The .inp file for the original looks fine, but the file for the second
model is empty, even though the model runs and works just fine in eQUEST.

???

*R. Aaron Derr, PE, LEED AP, CEM, GBE*

------------------------------

*From:* Sami, Vikram [mailto:Vikram.Sami at perkinswill.com]
*Sent:* Thursday, February 07, 2013 9:56 AM
*To:* Byron Burns; Aaron Derr
*Cc:* equest-users at lists.onebuilding.org
*Subject:* RE: [Equest-users] Multistack (DHRC) Dedicated Heat Recovery
Chiller

I have nothing to add to Byron?s very thorough response except that in
newer versions of eQUEST (I think versions 3.5 and above) you can select an
inp file as a parametric run.

Byron ? great series of images. Would you mind sharing your inp file?

* *

*Vikram Sami*, LEED AP BD+C

*From:* equest-users-bounces at lists.onebuilding.org [mailto:
equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Byron Burns
*Sent:* Thursday, February 07, 2013 10:35 AM
*To:* Aaron Derr
*Cc:* equest-users at lists.onebuilding.org
*Subject:* Re: [Equest-users] Multistack (DHRC) Dedicated Heat Recovery
Chiller

Aaron,

You will need to model it in the detailed mode, and use two models to
compare the savings rather than EEM or parametric runs. You will need to
make sure the HW loop is set to operate at or below the Design-Cond-T
setting. Normally there is a back up chiller that operates when there is
not a simultaneous heating and cooling load so you will need to create a
control scheme as well. Some sample inputs are below

*Byron D. Burns*

*From:* equest-users-bounces at lists.onebuilding.org [mailto:
equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Aaron Derr
*Sent:* Wednesday, February 06, 2013 5:45 PM
*To:* equest-users at lists.onebuilding.org
*Subject:* [Equest-users] Multistack (DHRC) Dedicated Heat Recovery Chiller

Can anyone guide me as to how to go about modeling a Multistack (DHRC)
Dedicated Heat Recovery Chiller in eQUEST as a proposed EEM?

Thank you,

*R. Aaron Derr, PE, LEED AP, CEM, GBE*

aderr's picture
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Joined: 2012-11-28
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TA-DA! That was it.

Thank you so much, Patrick! (and everyone else!)

*R. Aaron Derr, PE, LEED AP, CEM, GBE*

------------------------------

*From:* Patrick J. O'Leary, Jr. [mailto:poleary1969 at gmail.com]
*Sent:* Friday, February 08, 2013 1:49 PM
*To:* Aaron Derr
*Subject:* Re: [Equest-users] Multistack (DHRC) Dedicated Heat Recovery
Chiller

make sure you're NOT looking at the "filename-baseline.inp" file instead of
the filename.inp file. the file w/the -baseline.inp added to it is
typically empty unless the simulation is actually running. not sure of its
use but i did that yesterday - opened the wrong/empty .inp file & became
confused.

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