[bldg-sim] eQUEST HVAC sizing runs

[Aulbach, John]

Andy:
 
For chiller and boilers, go into the Water Side Tab (I assume you are in
the Detailed Edit Mode by this time), click on either chiller of boiler,
go to the far right side to Capacity Ratio, and input 1.15 for chiller,
and 1.25 for boilers.
 
For TWO identically sized machines,  use the logic shown below from the
DOE2 help tab in eQuest.
 

CAPACITY-RATIO


The fraction of the design loop capacity that the chiller will be sized
to meet. This keyword is allowed only if CAPACITY is not specified. If
you are defining two chillers of identical size that exactly meet the
design loop load, set each chiller's CAPACITY-RATIO to 0.5. To include a
20% safety factor, set each chiller's CAPACITY-RATIO to 0.6. If neither
CAPACITY nor CAPACITY-RATIO is specified, the chiller capacity will
default to the loop capacity divided by the number of chillers attached
to the loop.


________________________________

From: bldg-sim at gard.com [mailto:bldg-sim at gard.com] On Behalf Of Andy
McNamara
Sent: Thursday, February 15, 2007 12:48 PM
To: bldg-sim at gard.com
Subject: [bldg-sim] eQUEST HVAC sizing runs


Hello,

As I mentioned previously, I am creating an energy model for a LEED
project.  In "baselining" the building, one of the stipulations of
ASHRAE 90.1 2004 is:
"G3.1.2.2 Equipment Capacities.  The equipment capacities for the
baseline building design shall be based on sizing runs for each
orientation and shall be oversized by 15% for cooling and 25% for
heating" 

I think that means I use "auto-size", but then how do I capture what
that size is and oversize it accordingly?  I am guessing that the
results may be in the SIM file.  Can anyone provide tips for executing
this?  Is there a better way to do that auto-sizing for each
orientation? 

Thanks,
Andrew McNamara



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