[Equest-users] Dual Duct with package Cooling

Tue Jun 14 14:14:32 PDT 2022

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>
Sent: Tuesday, June 14, 2022 5:06 PM
To: Melissa Crowe <MCrowe at cmta.com>; John Aulbach <jra_sac at yahoo.com>; 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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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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