[Equest-users] MRT in eQUEST

[Alex Krickx]

I read John's question as asking: can you get the MRT for each surface? - perhaps I misread it. I would assume, though, that if you could get it for each surface, than you could calculate the PMV of each zone. Your end result would show that zone A had -4 and B had +4 and they wouldn't be averaged together. This approach would understand and provide results that back up Vikram's point that a space near a façade will experience different MRT than a core zone. Is that not possible in eQUEST?

Regards,
Alex Krickx


Alex Krickx
Building Energy Specialist
[cid:image001.jpg at 01CB1921.F0F9F7C0]
1250 Elko Dr, Sunnyvale, CA 94089
(t) 408.541.8124

Warning: The information contained in this e-mail may be privileged attorney-client communications or attorney work product and/or proprietary and confidential.  If the reader of this message is not the intended recipient then you have received it in error and any review, distribution or copying of this message is prohibited and you are to notify us immediately by reply e-mail and delete the original message immediately.



From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Sami, Vikram
Sent: Thursday, July 01, 2010 1:17 PM
To: Grando, John; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] MRT in eQUEST

John,

I'm guessing you wouldn't be doing this analysis on a project unless you were concerned about thermal comfort issues from skin related stimuli.

So if you had a PMV of +4 in one zone and -4 in another would you say that on average everyone in your building is comfortable?

Calculating MRT in a lumped node simulation program is kind of like that - an average MRT for a zone is often misleading. For example - a room with a large west window in the summer time will have a much higher MRT for someone sitting next to the window than for someone sitting near an interior wall on the other side - especially if there is direct sunlight in the room. Similarly - in winter - proximity to a north window might result in a much lower MRT than for someone sitting near the core.
Bottom line - you pick the tool that's appropriate to the analysis. You really want a full-field solution tool (like a CFD program or a thermal software like RADtherm) to perform comfort analyses like this.


Vikram Sami, LEED AP
Sustainable Design Analyst
1382 Peachtree St. NE, Atlanta, GA 30309
t: 404-443-7462    f: 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] On Behalf Of Grando, John
Sent: Thursday, July 01, 2010 3:36 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] MRT in eQUEST

Hello All,

I have to calculate the PMV for a zone and I did the analysis already in eQUEST.  I need the mean radiant temperature though to perform this calc.  I am pretty sure that MRT is not an output variable so I'm guessing I need to calculate the wall temperatures and do it myself.  Has anyone tried to do this before?  I didn't find anything in the archives or in the DOE22 manual.  Thanks.


John Grando LEED AP| Mechanical Engineer




NOTICE OF CONFIDENTIALITY This E-mail message and its attachments (if any) are intended solely for the use of the addressees hereof. In addition, this message and the attachments (if any) may contain information that is confidential, privileged and exempt from disclosure under applicable law. If you are not the intended recipient of this message, you are prohibited from reading, disclosing, reproducing, distributing, disseminating or otherwise using this transmission. Delivery of this message to any person other than the intended recipient is not intended to waive any right or privilege. If you have received this message in error, please promptly notify the sender by reply E-mail and immediately delete this message from your system.

This email and any files transmitted with it are confidential and intended solely for the addressee. If you are not the named addressee you should not disseminate, distribute, copy, or alter this email.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20100701/64c67a6b/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 5602 bytes
Desc: image001.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20100701/64c67a6b/attachment.jpg>