[Equest-users] Light Shelves

[Jay Keazer]

What about building an internal wall to represent the light shelf?  Would this have an effect on the daylight calculation algorithm in eQUEST?  It takes into account reflection off of internal walls right?  Paul, if you're saying the effects of light shelves are primarily aesthetic and comfort-related, would you make any modifications in eQUEST to account for having them in the space, or is the amount of daylight eQUEST calculates essentially unaffected by the light shelf?
Thanks,
Jay Keazer, EI
Energy Engineer
TME, Inc.
2039 N Green Acres Road
Fayetteville, AR  72703

ph   479.521.8634
fax  479.521.1014
jkeazer at tmecorp.com<mailto:email at tmecorp.com>



From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Paul Erickson
Sent: Friday, November 21, 2008 2:45 PM
To: equest-users at lists.onebuilding.org; Amol Mehta; Timothy Howe; Demba Ndiaye
Subject: Spam:Re: [Equest-users] Light Shelves

Mehta/Demba,

Before taking the approach of increasing "the proportion of your space that benefits from daylighting as a result of the deeper light penetration allowed by the shelves," you should use a detailed daylight simulation program to determine if any extra credit should be attributed to your chosen light shelves.  Though conceptual renderings and many designers tend to suggest there is great deep daylight benefit, most daylighting experts suggest the real benefits to be the reduction in direct solar radiation striking occupants and the fact that the bounced light dispels shadows/contrast areas on the ceiling near the window, enhancing the overall ambient lighting of the space.

Regards,

Paul

Paul Erickson
Sustainable Team Leader
Affiliated Engineers, Inc
www.aeieng.com<http://www.aeieng.com/>
608.236.1112
303.859.7523 - c
P Please consider the environment before printing this message.


>>> "Demba Ndiaye" <Demba.Ndiaye at uoit.ca> 11/20/2008 4:45 PM >>>
One possibility is to model daylighting as usual and increase the
proportion of your space that benefits from the daylighting as a result
of the deeper light penetration allowed by the shelves.

_____________
Demba Ndiaye

-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Howe,
Timothy
Sent: Thursday, November 20, 2008 5:21 PM
To: Amol Mehta; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Light Shelves

Not possible as of yet.

-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Amol
Mehta
Sent: Thursday, November 20, 2008 5:17 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Light Shelves

Hi

I am trying to model Light Shelves in E-Quest for day lighting. Can you
please help me on this? Thanks


Amol Mehta | Mechanical Engineer | P2S Engineering, Inc.
T 562 497 2999 | F 562 497 2990 | M 858 354 6250 5000 East Spring
Street, 8th Floor, Long Beach, CA  90815 -----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
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equest-users-request at lists.onebuilding.org
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Subject: Equest-users Digest, Vol 8, Issue 22

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Today's Topics:

   1. PIU vs. VAV in eQuest (Matthew Dubrovich)
   2. Re: PIU vs. VAV in eQuest (Kevin Madison)


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

Message: 1
Date: Thu, 20 Nov 2008 09:06:50 -0700
From: "Matthew Dubrovich" <mdubrovich at emcengineers.com>
Subject: [Equest-users] PIU vs. VAV in eQuest
To: <equest-users at lists.onebuilding.org>
Message-ID:
<216F285E03BAC04B9F6E6F17D4C7405E121B6684 at VS6.EXCHPROD.USA.NET>
Content-Type: text/plain; charset="us-ascii"

For those that are on both the BLDG-SIM and this list, I apologize for
the repost...





Question on PIU vs. VAV systems in eQuest...



If a PIU system has only SVAV boxes and all other parameters are
identical, does the PIU act like a VAV in eQuest?  Only changing the
system type in my model seems to have a significant impact on energy
usage and I can't track down why that is.  The difference is significant
enough that with App. G System 7 VAV w/RH, the choice between PIU and
VAV has an effect on the number of points.  Any thoughts would be
appreciated.





Thanks,



Matt



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Message: 2
Date: Thu, 20 Nov 2008 09:00:21 -0800
From: Kevin Madison <kevinjm5000 at yahoo.com>
Subject: Re: [Equest-users] PIU vs. VAV in eQuest
To: Matthew Dubrovich <mdubrovich at emcengineers.com>
Cc: equest-users at lists.onebuilding.org
Message-ID: <492597A5.50208 at yahoo.com>
Content-Type: text/plain; charset=windows-1252; format=flowed

Matt -
You may be observing the result of the different default for
"THERMOSTAT-TYPE" for zones served by each system. The default for VAVS
is "REVERSE-ACTION" while it is "PROPORTIONAL" for PIU. Take a look in
the DOE-2 documentation for descriptions of each of these and how this
property affects ZONE terminal unit and SYSTEM operation.
- Kevin

Kevin Madison
Madison Engineering PS
Seattle WA


Matthew Dubrovich wrote:
>
> For those that are on both the BLDG-SIM and this list, I apologize for

> the repost?
>
> Question on PIU vs. VAV systems in eQuest?
>
> If a PIU system has only SVAV boxes and all other parameters are
> identical, does the PIU act like a VAV in eQuest? Only changing the
> system type in my model seems to have a significant impact on energy
> usage and I can?t track down why that is. The difference is
> significant enough that with App. G System 7 VAV w/RH, the choice
> between PIU and VAV has an effect on the number of points. Any
> thoughts would be appreciated.
>
> Thanks,
>
> Matt
>
> ----------------------------------------------------------------------
> --
>
> _______________________________________________
> Equest-users mailing list
> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
> To unsubscribe from this mailing list send  a blank message to
EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG
>


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