[BLDG-SIM] Trane System Analyzer

Lemmon, Mike mlemmon at trane.com
Mon Mar 5 07:12:10 PST 2001


Mark,

System Analyzer uses one perimeter zone per floor.  Therefore, there is no
diversity accounted for in the model.  The load at one point on the east
side of the perimeter zone is modeled as the same load found at any point on
the west side at the design hour or during the simulation.  While the
program generates a "rough" design load in it's wizard role, the program
documentation warns against using System Analyzer to generate heating and
cooling loads for system or building design.  

The program works very well in an energy and economic analysis role as this
"average design" can be adjusted prior to running an energy simulation.
There is overstatement of the amount of energy needed to cool or heat the
west portion of the perimeter zone in the morning hours.  This overstatement
is counterbalanced by the opposite effect in the afternoon. The program will
do a good job reporting the net energy required to maintain space conditions
during the simulation.  

DO NOT USE SYSTEM ANALYZER FOR A LOAD DESIGN TOOL. It is an excellent
comparative anlysis and energy analysis tool.  I would Also like to point
out that the user is able to model performance curves for all equipment
included in the equipment library making this a level analysis tool for
those concerned with "equipment vendor software".   

Best Regards,


Mike Lemmon

Account Executive Federal Sector Team 
AMS - The Trane Company
Bldg 17-2, 3600 Pammel Creek Road
LaCrosse, WI 54601

Office: 608.787.4297
Mobile: 612.845.4495
Fax: 630.214.0835
mlemmon at trane.com




-----Original Message-----
From: Mark E. Case [mailto:mcase at etcgrp.com]
Sent: Monday, March 05, 2001 8:37 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Trane System Analyzer


I'm not very familiar with Trane's System Analyzer but have a particular
question: According to Trane's website,
"System Analyzer generalizes building load characteristics. All buildings
are calculated as rectangular with two zones - an interior and a perimeter -
and evenly distributed internal loads, ventilation, and glass."
I'm looking at a project reference to 75 zones in a 15 story building.
That's five zones per floor which implies four perimeter and one internal
zone per floor.
Questions:
Does SA use four perimeter zones per floor? Or one?



Mark E. Case, P.E.
etc Group, Inc.


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