[Equest-users] Query regarding PDEC ( Passive cooling ) simulation in eQuest

[Sami, Vikram]

Another option to look into is CoolT developed by Nader Chalfoun at University of Arizona in Tucson. It's a Dos program that is based on empirical data that they collected from the extensive testing they did on Cool Towers (Passive Downdraught Chimneys).

Again - I would throw in words of caution. Passive downdraught chimneys rely on buoyancy driven forces - something that you cannot approximate with a fan driven evaporative cooler or wind driven. eQUEST might be able to model this, but its beyond my knowledge. Also - The folks at UA (Nader Chalfoun & Martin Yoklic) did some testing with cool towers in enclosed spaces. I would try writing to them to get some feedback on issues to consider.

I think Nader is on this list - not sure if he's still active.


Vikram Sami, LEED AP BD+C
Sustainable Design Analyst
1315 Peachtree St. NE, Atlanta, GA 30309
t: 404-443-7462    f: 404.892.5823       e: vikram.sami at perkinswill.com   www.perkinswill.com<http://www.perkinswill.com/>
Perkins+Will.  Ideas + buildings that honor the broader goals of society


From: Mansi Jayswal [mailto:ar.mansi.jayswal at gmail.com]
Sent: Thursday, March 08, 2012 2:40 AM
To: Design Builder USA
Cc: Dahlstrom, Aaron; Sami, Vikram; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Query regarding PDEC ( Passive cooling ) simulation in eQuest


Thank you all for your quick response and Information.

Is it possible that if i use PHDC software to design the PDEC system and simulate the same building in eQuest ??  PHDC software can give me the required size of the passive down draught evaporating cooling towers for the building.

On Wed, Mar 7, 2012 at 9:37 PM, Design Builder USA <jcrossett at designbuilderusa.com<mailto:jcrossett at designbuilderusa.com>> wrote:
You may wish to explore the free trial of Design Builder, as it has CFD, natural ventilation and evaporate cooling.
Tho I am not sure if it can be used for your passive cooling requirement or not..

Best of luck
On Wed, Mar 7, 2012 at 6:53 AM, Dahlstrom, Aaron <ADahlstrom at in-posse.com<mailto:ADahlstrom at in-posse.com>> wrote:
Mansi -

We have done some schematic modeling of wind towers with Fluent, a CFD package as noted.
Our climate didn't justify evaporative pre-cooling.

eQUEST has a natural ventilation module, which I have not fully dived into.

I believe it requires inputs that would likely be validated by a CFD model - for example, I don't think eQUEST's natural ventilation model allows for evaporative pre-cooling as a temperature driver for natural air exchange in a space.
As eQUEST models each zone as a fully mixed space, and has limited air transfer between zones, you may also have trouble getting the thermal stratification from eQUEST that would typically be needed to drive natural ventilation in a PDEC.

Aaron Dahlstrom , PE, LEED(r) AP
In Posse - A subsidiary of AKF| 1500 Walnut Street, Suite 1414, Philadelphia, PA 19102
d: 215-282-6753<tel:215-282-6753>| m: 267-507-5470<tel:267-507-5470>| In Posse: 215-282-6800<tel:215-282-6800>| AKF: 215-735-7290<tel:215-735-7290>
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From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org>] On Behalf Of Sami, Vikram
Sent: Wednesday, March 07, 2012 8:53 AM
To: Mansi Jayswal; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] Query regarding PDEC ( Passive cooling ) simulation in eQuest

Mansi,

I doubt you can do this credibly in eQUEST. You really need a CFD type package to be able to simulate this. . A word of caution - the effort to develop the simulation for this is a master's thesis in itself.




Vikram Sami, LEED AP BD+C
Sustainable Design Analyst
1315 Peachtree St. NE, Atlanta, GA 30309
t: 404-443-7462<tel:404-443-7462>    f: 404.892.5823<tel:404.892.5823>       e: vikram.sami at perkinswill.com<mailto:vikram.sami at perkinswill.com>   www.perkinswill.com<http://www.perkinswill.com/>
Perkins+Will.  Ideas + buildings that honor the broader goals of society


From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org]<mailto:[mailto:equest-users-bounces at lists.onebuilding.org]> On Behalf Of Mansi Jayswal
Sent: Tuesday, March 06, 2012 11:25 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Query regarding PDEC ( Passive cooling ) simulation in eQuest


Hello friends,

My name is Mansi Jayswal. I am a final year student of Masters Programme at CEPT University, India. By profession I am an architect. Currently I am doing thesis on passive cooling technique (Passive down draught evaporative cooling system- PDEC ). And try to identified that how much cooling load of HVAC system can be replaced through this system.

Now my query is that is it eQuest is capable to simulate such building with wind tower or PHDC (PDEC ) system? If anybody knows please kindly reply. I have very days left for final submission and I am stuck here.

Thanks

--

Regards,
Mansi Jayswal,
B.Arch I IGBC AP I M.Tech in Climate Change & Sustainable Development
Faculty of Sustainable Environment & Climate Change,
Centre for Environmental Planning & Technology (CEPT) University


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Jeremiah D. Crossett
Energy Modeling Consultant
503-688-8951
www.DesignBuilderUSA.com<http://www.DesignBuilder.com>







--

Regards,
Mansi Jayswal,
B.Arch I IGBC AP I M.Tech in Climate Change & Sustainable Development
Faculty of Sustainable Environment & Climate Change,
Centre for Environmental Planning & Technology (CEPT) University

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