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

[Michael Tillou]

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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