[Equest-users] [Bldg-sim] eQuest - Energy consumption increasing on reducing Glass U-Value

Fri Nov 3 06:34:23 PDT 2017

Hi Akshay,
If you care to share your model, eQUEST users can take a look at it.
You could email your .pd2, .inp and weather files to equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>.
Regards,
~Bill

William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer

[cid:image002.jpg at 01D35487.0E16F4E0]  [cid:image004.jpg at 01D35487.0E16F4E0]

134 South Fitzhugh Street                 Rochester, NY 14608

T: (585) 698-1956                        F: (585) 325-6005

bbishop at pathfinder-ea.com<mailto:wbishop at pathfinder-ea.com>             www.pathfinder-ea.com<http://www.pathfinder-ea.com/>

[http://png-5.findicons.com/files/icons/977/rrze/720/globe.png]Carbon Fee and Dividend - simple, effective, and market-based.

From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jim Dirkes via Bldg-sim
Sent: Friday, November 03, 2017 9:24 AM
To: akshay gupta <akshaykg at gmail.com>
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] eQuest - Energy consumption increasing on reducing Glass U-Value

That's good to know and rules out my scenario.

I think I can't help more without more details, but I'm also unfamiliar with eQuest.

If you were using EnergyPlus, I'd recommend adding a set of detailed output variables to study the energy use pattern more closely. Perhaps you can do something like that with eQuest....

On Fri, Nov 3, 2017 at 9:18 AM, akshay gupta <akshaykg at gmail.com<mailto:akshaykg at gmail.com>> wrote:
Hi Jim

Thanks for the reply. Actually, the project we are modelling are designed to be energy efficient commercial spaces. So for example, interior LPD is not more than 0.5 W/sqft (LED lights), EPD is around 2.0 - 2.5 W/sqft, Occupant Density is around 50 Sqft /person. So I dont see any area where internal heat gain is unusually higher where the building needs to cool itself off by conducting heat outside (inside hotter than outside).

I think there something else.

Regards

Akshay

On 3 November 2017 at 18:42, Jim Dirkes <jim at buildingperformanceteam.com<mailto:jim at buildingperformanceteam.com>> wrote:
Akshay,
While there are many things that could contribute to this situation, consider:
A smaller U value means that there is less conduction through the construction. With less conduction, a smaller cooling load will normally decrease cooling energy.

An exception to this is when internal loads are higher than normal. In that case, the building needs to get rid of internal heat (provide cooling) most of the year. When the envelope has more insulation (lower U-value), it inhibits heat removal and can increase cooling energy.

Thanks to my friend Javed Iqbal for reminding me of this recently. He is preparing a paper which discusses this phenomenon for buildings in the central European climate.

On Fri, Nov 3, 2017 at 8:37 AM, akshay gupta via Bldg-sim <bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>> wrote:
Hi There

I am facing an issue in eQuest in almost all simulation models for most hot and composite indian climates. Whenever we reduce U-value of glass in model, from Single Glazing U-Value of 1 Btu/hr Sqft F to 0.32 Btu/hr Sqft F (or any other U-value lower than 1), we see an increase in energy consumption.

Can someone point out principal mistake that may be making in the model.

Thanks in advance.

Regards

Akshay Gupta

_______________________________________________
Bldg-sim mailing list
http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org
To unsubscribe from this mailing list send  a blank message to BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG<mailto:BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG>

--
James V Dirkes II, CEO / President
The Building Performance Team Inc.
1631 Acacia Dr, Grand Rapids, MI 49504<https://maps.google.com/?q=1631+Acacia+Dr,+Grand+Rapids,+MI+49504&entry=gmail&source=g>

(alphabet soup of efforts for greater understanding: PE, BEMP, BCxP, LEED AP)

Direct / Mobile: 616.450.8653<tel:(616)%20450-8653>
jim at buildingperformanceteam.com<mailto:jim at buildingperformanceteam.com>

Website <http://buildingperformanceteam.com> l  LinkedIn<https://www.linkedin.com/pub/jim-dirkes/7/444/413>

Coffee conversation:

Humility is loving the truth so much that you are willing to hear it from everyone.

--
James V Dirkes II, CEO / President
The Building Performance Team Inc.
1631 Acacia Dr, Grand Rapids, MI 49504

(alphabet soup of efforts for greater understanding: PE, BEMP, BCxP, LEED AP)

Direct / Mobile: 616.450.8653
jim at buildingperformanceteam.com<mailto:jim at buildingperformanceteam.com>

Website <http://buildingperformanceteam.com> l  LinkedIn<https://www.linkedin.com/pub/jim-dirkes/7/444/413>

Coffee conversation:

Humility is loving the truth so much that you are willing to hear it from everyone.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20171103/89a88ed1/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.jpg
Type: image/jpeg
Size: 1517 bytes
Desc: image002.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20171103/89a88ed1/attachment-0008.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image004.jpg
Type: image/jpeg
Size: 1647 bytes
Desc: image004.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20171103/89a88ed1/attachment-0009.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image006.png
Type: image/png
Size: 3856 bytes
Desc: image006.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20171103/89a88ed1/attachment-0004.png>