[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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