[BLDG-SIM] ASHRAE 90.1 ECB System 6

Larry Degelman larry at taz.tamu.edu
Mon Jul 12 08:57:47 PDT 2004


My opinion only, not as an authority:

System 6 (water-source heat pump with DX cooling) is definitely not an
air-cooled chiller or an air-cooled heat pump.  I'm fairly certain that
it is a water-cooled chiller with DX on the air side, commonly referred
to as a water-to-air heat pump.  Is this what you have?  This is in
contrast to generating chilled water on your load side, which would be a
water-to-water heat pump.  With either system, the modeling for
"proposed design" needs to be the same as what you model for the "budget
building design".  Also, be aware of the 6.3.1 and 6.3.1.2 stipulations
on water economizers.

Not sure if this helps!
===================================== 
Larry O. Degelman, P.E.                  larry at taz.tamu.edu 
2206 Quail Run 
College Station, TX 77845
Ener-Win site: http://www.cox-internet.com/larryd/enerwin 
=====================================
 

-----Original Message-----
From: postman at gard.com [mailto:postman at gard.com] On Behalf Of Galen
Staengl
Sent: Monday, July 12, 2004 9:31 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] ASHRAE 90.1 ECB System 6



I am looking for help interpreting ASHRAE 90.1-1999.  I am modeling a
building with a ground source heat pump, and it looks like the ECB
system
should be System 6.  System 6 is listed as a water source heat pump, but
the
cooling type is listed as Direct Expansion.  I'm not sure whether to
model
this as a water source heat pump with an air cooled chiller (doesn't
make a
lot of sense), or an air cooled heat pump with a water source heat pump
for
heating (also doesn't make a lot of sense), or a water source heat pump
with
a air cooled fluid cooler to cool the water (might make sense but
certainly
is not a "direct expansion" system.  I appreciate any advice on the
subject.

Thanks,


 Galen Staengl, P.E.
  
  129 Goodman St.
  Charlottesville, VA  22902
  (434)295-8105 (phone)
  (434)295-8105 (fax)
  www.staenglengineering.com



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