[Equest-users] peak heating demand
Arpan Bakshi
arpanbakshi at gmail.com
Wed May 18 15:07:51 PDT 2011
Deepika
Sizing is based only on peak load or what is also called design load.
Building A could have a peak load which is half of Building B, but if
Building A is running its systems at peak capacity 24/7, its annual
energy use could be many times that of Building B.
Arpan Bakshi, LEED AP BD+C
YRG sustainability
On May 18, 2011, at 5:44 PM, deepika khowal <deepika.khowal at gmail.com>
wrote:
> Thanks Alex
> I think the explanation you gave was very clear.
> so when we design HVAC system, which loads we should consider?
> for windows with better R-values, the peak load may b lesser but its
> overall annual demand will be higher.
> how to account for this in HVAC sizing?
>
>
> On Wed, May 18, 2011 at 12:02 PM, Alex Krickx <akrickx at seriousmaterials.com
> > wrote:
> Hi Deepika,
>
>
>
> I’m not sure how eQUEST calculates loads, but I can imagine a scenar
> io where your results make sense:
>
>
>
> Peak heating load probably happens at night/early in the morning,
> right? So it probably depends on insulation (R-value) and not solar
> gains (SHGC). My guess is the window with the higher peak demand has
> low R-value (since you need lots of heat to make up for losses). But
> this window could have a high SHGC, so when the sun is out you
> benefit from passive heating (and have lower annual heating demands).
>
>
>
> I’m guessing your other window (with lower peak heating) has a bette
> r R-value - it retained heat better. This window may have a lower SH
> GC (possibly due to additional low-e coatings) and so it get less pa
> ssive heating throughout the year and needs more heat to be added to
> the building during daytime hours.
>
>
>
> This will depend on the windows you’ve modeled, building type and cl
> imate. Perhaps if you share some more info on the project the answer
> will present itself.
>
>
>
> Regards,
>
> Alex Krickx
>
>
>
> Alex Krickx, LEED AP
>
> Building Energy Specialist
>
> <image001.jpg>
>
> 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 deepika khowal
> Sent: Wednesday, May 18, 2011 11:19 AM
> To: equest-users at lists.onebuilding.org
> Subject: [Equest-users] peak heating demand
>
>
>
> Hi all
>
> I am modeling the performance of different glazing types in a
> building.
>
> I realized for one glazing, the peak gas demand is lower than other
> glazing but total heating energy is higher?
>
> how does equest calculate these loads and energy?
>
> Thanks
>
>
>
>
> _______________________________________________
> 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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20110518/25ddd597/attachment-0002.htm>
More information about the Equest-users
mailing list