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

[Julien Marrec]

50 sqft/person (5m2 per p) seems like a very high occupant density for an office building (depending how you calculate it, if you include corridors)


——
Sent from a mobile device, please excuse the brevity.
Julien Marrec, EBCP, BPI MFBA
Owner


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> Le 3 nov. 2017 à 14:34, Bishop, Bill via Bldg-sim <bldg-sim at lists.onebuilding.org> a écrit :
> 
> 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.
> Regards,
> ~Bill
>  
> William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers & Architects LLP
> Senior Energy Engineer
> <image002.jpg>  <image004.jpg>
>  
> 134 South Fitzhugh Street                 Rochester, NY 14608
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> 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> 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> 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> 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 
>  
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> James V Dirkes II, CEO / President
> The Building Performance Team Inc.
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>  
> --
> 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
> 
> Website l  LinkedIn
> Coffee conversation:
> 
> Humility is loving the truth so much that you are willing to hear it from everyone.
> 
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> 
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