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Re: [EnergyPlus_Support] Leed Points For Residential High Rise Buildings



I would make 2 comments:
1) Pumping a lot of water is only bad if you do it at a high pressure. The hydronic calcs are important to consider.
2) Residential Projects are difficalt because 90.1 does not regulate some things for them (like lighting, which is a big hitter) and so it makes savings relative to baseline hard (as you know, unregulated things mostly have to be modeled the same in both models). However, LEED will allow for a few special exceptions, but it increases documentation...such as process loads vs the baseline (from memory the proposed building has to incorporate an energystar program of sorts and document it). I would ask on LEEDuser EAp2 for more help.

Mit freundlichen GrüÃ?en- Sent from my iPhone (excuse the brevity)

i. A.
Jean Marais
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On 04.11.2014, at 20:59, "Jim Dirkes jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

As you know, equipment that operates a lot of hours each year can impact annual energy use disproportionately to its horsepower; fans and pumps are the normal culprits.  Because of that, constant speed vs. variable speed can make a LOT of difference in a comparison,
A big aid for comparison is to report Output:Variables and Output:Meter / Meter:Custom for key components. You can drill down to individual components or classes of components.  Because you have very fine details, you can analyze the portions of the year where energy gets used and understand a path forward that will optimize performance

On Tue, Nov 4, 2014 at 2:45 PM, 'Edward G. Lyon' eglyon@xxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
 

Our base line is by the book inputs.  We donâ??t have a DOAS for the residential units.  We have it in the halls, but baseline and proposed are identical for the halls and use PTACs. Our proposed is using some template defaults for the WSHP, but we have not been given actual equipment except for some limited COP data.  However, it does make sense to me that the WSHP loop needs to pump more water year round that a high temp heating coil loop.  I believe we are using variable speed drives, but a single pump (not staged) because the mechanical is not developed enough yet.

 

Ned Lyon, P.E. (MA, WV)
Staff Consultant

SIMPSON GUMPERTZ & HEGER
781.907.9000 main
781.907.9350 direct 
617.285.2162 mobile 
781.907.9009 fax
www.sgh.com

 

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Tuesday, November 04, 2014 2:06 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Leed Points For Residential High Rise Buildings

 

 

Ned,

Do you know what your part-load performance looks like?  Is it a fair representation for both Baseline and Proposed?

Similar checks for pump energy? DOAS efficiency?

 

On Tue, Nov 4, 2014 at 1:24 PM, 'Edward G. Lyon' eglyon@xxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

I am looking for a reality check from some experienced modelers.  We have been running Leed checks on some proposed high rise residential buildings.  The base buildings must have PTACs and hot water coils.  The proposed building would like to use WSHP.  Our findings are that WSHP alone will not generate any credits (actually costs more).  It appears that any efficiency in unit equipment and energy exchange is lost in the water loop pumping, cooling tower operation and compressor operation for heating.  Larger windows with poorer SHGC in the proposed doesnâ??t help either.  Is this similar to other peopleâ??s experience? Or are we missing something that could save the day?  Are more efficient PTACs (and smaller, better windows) the only way to go?

 

Thanks in advance?as Iâ??ve said before, I seldom model actuaal mechanical systems in the work I do with EnergyPlus.

 

Ned Lyon, P.E. (MA, WV)
Staff Consultant

SIMPSON GUMPERTZ & HEGER 
     | Engineering of Structures and Building Enclosures

41 Seyon Street, Bldg. 1, Suite 500
Waltham, MA 02453

781.907.9000 main
781.907.9350 direct 
617.285.2162 mobile 
781.907.9009 fax
www.sgh.com



 

--

 

James V Dirkes II, PE, BEMP, LEED AP
The Building Performance Team
1631 Acacia Drive, Grand Rapids, MI 49504
(M) 616 450 8653

The more one does what is good, the freer one becomes. There is no true freedom except in the service of what is good and just.




--

 

James V Dirkes II, PE, BEMP, LEED AP
The Building Performance Team
1631 Acacia Drive, Grand Rapids, MI 49504
(M) 616 450 8653

The more one does what is good, the freer one becomes. There is no true freedom except in the service of what is good and just.



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