[Equest-users] how to make a cooling load profile?
David Eldridge
dse at grummanbutkus.com
Wed Feb 29 13:50:15 PST 2012
How about the DOE Reference buildings?
David
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David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP
*Grumman/Butkus Associates*
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*From:* equest-users-bounces at lists.onebuilding.org [mailto:
equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Nessle, Willis
*Sent:* Wednesday, February 29, 2012 2:02 PM
*To:* equest-users at lists.onebuilding.org
*Subject:* [Equest-users] how to make a cooling load profile?
Hi everybody,
I need to generate an 8760 hour cooling load profile for a generic
building. The purpose is to capture the total load that a bldg’s AC
equipment will need to meet.
I am NOT trying to simulate a specific building - just a generic “office”,
or “school”, or “hospital”, etc. To that end I dashed off a model w/o
entering a single user input – all SD Wizard defaults. Assumption being
that the defaults are suitable for “typical buildings”.
‘----> Is this a reasonable assumption (using all defaults to represent
“typical” bldg)?
‘----> Or are there some inputs – like system parameters - that I must
define in order for the model to produce ball-park accuracy?
‘----> Which variables should I pull from the Hourly Blocks to make an 8760
hour report showing total cooling load equipment would need to meet?
*----> I noticed my “Building Loads” cooling load data (2 variables:
sensible, latent) are much greater than “Building HVAC” cooling load data
(1 variable: “coils+losses+gains”). “Building Loads” shows 472 kBtuh at
the peak while “Building HVAC” shows just 296 kBtuh at same time. What is
going on here?
*----> Finally, where do I find the OA Ventilation latent load?
My larger objective is to develop profiles for a fair size list of building
types with the most common equipment combinations (location: Texas).
I believe the cooling load depends on the equipment type to a certain
extent, since some loads are added by the system components, such as fan or
pump energy. Therefore, in order to develop a cooling (and heating)
profile for each building type/equipment type combination, I suspect I’ll
need to ensure that the system (and/or plant) is defined appropriately.
‘----> Is that the right way to think about it?
‘----> Which additional variables would I need to pull for the load profile
for a bldg. w/ a chilled water system?
‘----> Any suggestions?
(As you may have guessed, I’m familiar with eQUEST but have only limited
experience.)
Thanks for any advice,
Willis Nessle
Nexant, Inc.
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