[BLDG-SIM] Question About Equest - Space Peak Load Calculations

[Andrew Craig]

I'll also add that when you simulate a building using a California
climate zone, it automatically creates a Design Day report along with
the standard reports.  This is a nice feature that seems to only be
incorporated with the CZ climate zones.

Andrew Craig, EIT, LEED(r) AP | Mechanical Designer
INTERFACE ENGINEERING 
708 SW Third Avenue | Suite 400 | Portland, OR 97204 
direct: 503.382.2696
office: 503.382.2266
fax: 503.382.2262
email: Andrew_C at ieice.com
web: www.ieice.com 
Consultants of Choice to the Built Environment for over 35 years
Kirkland, WA | Portland, OR | Sacramento, CA | Salem, OR | SanFrancisco,
CA

-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Michael
Tillou
Sent: Tuesday, July 24, 2007 10:35 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Question About Equest - Space Peak Load Calculations

Before equest will use the Design Day information in the schedules you
need
to setup actual design days for the simulation to use.

You need to do this in the detailed edit under the Project & Site tab.
You
need to create both a heating and cooling design day and then input the
desired temperature extremes and duration that you wish to simulate.
Reference the climate design data in the ASHRAE Fundamentals Handbook
for
your location.  Once you create the design days equest will use them for
equipment sizing rather than the peak heating & cooling loads calculated
from the TMY weather data.

Mike

Michael Tillou, PE, LEED
P: 413-458-9870 C: 413-652-1087


-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Mark
Prince
Sent: Tuesday, July 24, 2007 1:04 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Question About Equest - Space Peak Load Calculations

I have a question about how Equest calculates the space peak load
calculation.

For all of my internal heat gains (people, lights, equipment) I have
schedules.  When you create a schedule, it not only asks for utilization
for
Sunday through Saturday, but it also asks for a schedule for Design
Cooling
and schedule for Design Heating.  I assume that the Design Cooling
Schedule/Design Heating Schedule is used by Equest to calculate the peak
cooling and heating load for the space.

For instance, lets say I have a laboratory with 8 watts/square foot of
equipment load.  From an energy standpoint, this equipment load really
never
gets higher than 50% throughout the year.  So I create my Sunday through
Saturday schedules with a peak utilization of 0.5000.  However, there
will
be sometimes where 8 watts/square foot will be generated in the
laboratory,
and I need to size my zone supply airflow for this 8 watts/square foot.
Therefore, I create my design cooling schedule to require a peak
utilization
of 1.000.  However, when I run the simulation and go to the "LS-B Space
Peak
Load Component" report the peak cooling load is using the 50%
diversified
load.  Why is this happening?  Shouldn't Equest be using the Design
Cooling
schedule which has a peak utilization of 1.000 all the time?

Sincerely,


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