[Bldg-sim] System sized by "block" or "peak"?

[Kevin Kyte]

Question:  When we size the design model systems to equal those in the
design documents, and have a baseline system type of packaged single zone.
A packaged single zone is assigned to every zone so system configuration is
different from design to basecase model.  How does one size the basecase
hvac systems?

 

 

Kevin Kyte, LEED AP

RobsonWoese, Inc.

(T) 716-636-1800

(F) 716-636-1856

 <http://robsonwoese.com/index.php> http://robsonwoese.com

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Karen Walkerman
Sent: Thursday, May 01, 2008 8:43 AM
To: yizhao1 at vt.edu
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] System sized by "block" or "peak"?

 

There can be a large difference but depends on your particular building.
For example, buildings with lots of glass on the east and west.  The cooling
loads in these individual spaces may be quite large, but the east has a high
cooling load in the morning while the west has a high cooling load in the
afternoon/evening.  My understanding for LEED is that the design case
systems are sized as in the design documents.  This provides punishment for
system inefficiency due to oversizing.

--
Karen



On Thu, May 1, 2008 at 3:24 AM, <yizhao1 at vt.edu> wrote:

Hi -
How great the difference could be if a system is sized by "block" compaired
to
being sized by "peak" in Trace? If "sized by peak" means sizing the system
based on peak load, what about "sized by block"? For LEED credit
application, Iov
thought that it is not right to size an AHU by "block" in the design case
while
size it by "peak" in the baseline.

Thanks!

Ying

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