Our base line is by the book inputs. We don’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 doesn’t help either. Is this similar to other people’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 I’ve said beffore, I seldom model actual 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
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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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Posted by: "Edward G. Lyon" <EGLyon@xxxxxxx>
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