[Equest-users] Dual Duct with package Cooling
Melissa Crowe
MCrowe at cmta.com
Tue Jun 14 14:33:34 PDT 2022
John
It often seems that reality was not the prime mover in the design of eQuest.
I could name several other system types that have similar limitations.
Maybe it would not be interesting if we didn't have to come up with cleaver work arounds.
Regards
Melissa Crowe, BEMP, LEED AP
Sr Mechanical/Energy Engineer
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From: John Aulbach <jra_sac at yahoo.com>
Sent: Tuesday, June 14, 2022 5:28 PM
To: David Eldridge <deldridge at grummanbutkus.com>; equest-users at lists.onebuilding.org; Melissa Crowe <MCrowe at cmta.com>; Chetan Kadakia <kadakia.energy at gmail.com>
Subject: Re: [Equest-users] Dual Duct with package Cooling
EXTERNAL SENDER: This email originated outside of CMTA. Do not click links or open attachments unless you know the sender and know the content is safe.
Thank you. Melissa, I think you hit the nail on the head. I am AMAZED that eQuest cannot formally do DX dual duct. Those systems certainly DO exist. Just never noticed the omission before in the program.
On Tuesday, June 14, 2022, 02:14:35 PM PDT, Melissa Crowe <mcrowe at cmta.com<mailto:mcrowe at cmta.com>> wrote:
I replied too fast the multi zone is only DX will not allow CHW.
However this is not thermally equivalent to Dual Duct where you can cool one zone while heating the other with out reheating.
Melissa Crowe, BEMP, LEED AP
Sr Mechanical/Energy Engineer
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From: David Eldridge <DEldridge at grummanbutkus.com<mailto:DEldridge at grummanbutkus.com>>
Sent: Tuesday, June 14, 2022 5:06 PM
To: Melissa Crowe <MCrowe at cmta.com<mailto:MCrowe at cmta.com>>; John Aulbach <jra_sac at yahoo.com<mailto:jra_sac at yahoo.com>>; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: RE: [Equest-users] Dual Duct with package Cooling
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Does it let you pick DX for the multizone AHU type?
David
David S. Eldridge, Jr., P.E., BEMP, BEAP, HBDP, GGF/A
Direct: (847) 316-9224 | Mobile: (773) 490-5038
Grumman|Butkus Associates | 820 Davis Street, Suite 300 | Evanston, IL 60201
Energy Efficiency Consultants and Sustainable Design Engineers
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From: Equest-users <equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org>> On Behalf Of Melissa Crowe via Equest-users
Sent: Tuesday, June 14, 2022 3:19 PM
To: John Aulbach <jra_sac at yahoo.com<mailto:jra_sac at yahoo.com>>; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] Dual Duct with package Cooling
Hi John
If by packaged Cooing you mean Air Cooled DX then, how about trying:
* Dual Duct system w. CHW
* "Chiller" = Air cooled with appropriate compressor type (recip or scroll) and count
* Pump power = 0
* CHW supply temperature = ~ DX evaporator T
Good luck
Melissa Crowe, BEMP, LEED AP
Sr Mechanical/Energy Engineer
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O: 508.647.9200
C: 978-204-2559
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From: John Aulbach <jra_sac at yahoo.com<mailto:jra_sac at yahoo.com>>
Sent: Tuesday, June 14, 2022 1:54 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Dual Duct with package Cooling
A friend of mine asked me about such a system. I looked it up, and lo and behold, eQuest doesn't this as a system.
Is there any equivalent system that can dynamically mimic this?
Thanks,
John R. Aulbach, PE
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