[Equest-users] Glazing envelope

Arpan Bakshi arpanbakshi at gmail.com
Thu Oct 27 10:36:30 PDT 2011


Hi Andres, adding to the EUI discussion, one thing to keep in mind is that CBECS data is collected in 2003, pre-90.1-2004, and a baseline built to 90.1-2007 should see 10-20 kBtu/ft2 less. That being said, your EUI should be 1/7th of what you are seeing. eQUEST is able to assign multiple equipment schedules; you may find your excessive EPD as you scroll over to the right, on your internal gains / equipment spreadsheet.


Arpan Bakshi


On Oct 27, 2011, at 1:04 PM, "Nick Caton" <ncaton at smithboucher.com> wrote:

> Hi Andres,
> 
>  
> 
> If you’re not defining glazing then your model’s envelope is at best akin to opaque glass… Thermally it’s probably about the same thing at night… but not once sun rises.  I would define glazing fenestrations as windows where you have them.
> 
>  
> 
> I haven’t done any projects in such proximity to the equator, so I’m not sure what’s the norm, but 750 EUI does appear fairly high for an office building.  Based on other things we can see on that report, I’d suggest you investigate/correct for two items before stressing over EUI:
> 
> 1.       Your consumed energy is overwhelmingly in the “misc equip” category – much more than I’ve ever encountered for an office building.  Review your space equipment and related inputs… Enduse categories are spelled out in the last few pages of  Help à Tutorials and Reference à Detailed Simulation Reports Summary.pdf
> 
> 2.       Your model is not cooling one or more spaces to the thermostats’ satisfaction for a significant portion of the year (1,926 unmet hours).  This may be directly related to the misc equip producing inordinately high internal heat loads, so deal with that issue first and this may go away. 
> 
>  
> 
> As to what EUI is “normal,” you may find energystar’s website is somewhat helpful (something done for the LEED templates anyway), but take any EUI’s determined there with a grain of salt… EUI is a funny metric that loses meaning the less you know about where the baseline data comes from, and I’ve found energystar’s web tool to favor “ease of use” over such detailed clarity in the past.  If you have a client interested in measuring performance using EUI, I would sooner research my own baseline by identifying the annual consumptions of a building similar in size, region and occupancy to draw comparisons against.
> 
>  
> 
> Someone else may have an alternative recommendation for EUI “rules of thumb” resources… I believe the onebuilding archives contain discussions on the topic.
> 
>  
> 
> ~Nick
> 
> <image003.jpg>
> 
>  
> 
> NICK CATON, P.E.
> 
> SENIOR ENGINEER
> 
>  
> 
> Smith & Boucher Engineers
> 
> 25501 west valley parkway, suite 200
> 
> olathe, ks 66061
> 
> direct 913.344.0036
> 
> fax 913.345.0617
> 
> www.smithboucher.com
> 
>  
> 
> From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Andres Franco Usme MicroCAD S.A.S
> Sent: Thursday, October 27, 2011 8:33 AM
> To: equest-users at lists.onebuilding.org
> Subject: [Equest-users] Glazing envelope
> 
>  
> 
> Hi everyone,
> 
> First of all, I want to say thanks’ for all your useful help, secondly I have another doubt, In my project the building envelope is a double glazing tilt wall, I’m using as construction for the envelope a material with the same u value specified for  the glass contractor, but I’m not using windows, this procedure can affects the results in energy consumption, cooling temps, etc?, third, the values that I had are big? As is my first model I’m full of doubts!!. The values that I’m obtaining are:
> 
>  
> 
> My project is as follows: 2 underground parking 180.000sft, first ground floor commercial 50.000 sft, and the fourth stories above are office open plan 70.000 sft each, the target certification level is LEED CS gold, this is my BEPS report, but I don’t have a clearly Idea if my results are so big or what.
> 
>  
> 
>  <image004.png>
> 
> Thanks again for all your comments, any suggestion or comment will be appreciated, best regards.
> 
>  
> 
>  
> 
> Cordialmente,
> 
>  
> 
> Andrés Franco U.
> 
> Arquitecto/ LEED Green Associate
> 
> Director División Arquitectura Construcción y Mantenimiento
> 
> MicroCAD S.A.S.
> www.microcad.info // blog.microcad.info
> Tel: (57) (4) 293 21 21 ext 108 // 444 81 49 // Fax: 604 16 02
> Calle 55 # 46-14 Ed. Perú Oriental Piso 13 // Medellín – Colombia
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