[bldg-sim] Out of Throttle Range.

[Renee J. Azerbegi]

You would need to follow the ECB method in ASHRAE 90.1 2001 or Appendix G of
ASHRAE 90.1-2004, depending on which LEED version you were using. In either
case you would need to model the base case building and the design case
building with a cooling system defined by the ECB or Appendix G for the base
case, even if there isn't one. This is unfortunate since buildings using
natural ventilation do not gain a benefit from an energy perspective. I have
heard that there is some lenience by the energy reviewers for naturally
ventilated buildings, but it may depend on which person is doing the LEED
energy review for the USGBC.

Renee

  _____  

From: bldg-sim at gard.com [mailto:bldg-sim at gard.com] On Behalf Of Graham &
Megan
Sent: Tuesday, November 15, 2005 12:06 PM
To: bldg-sim at gard.com
Subject: [bldg-sim] Out of Throttle Range.

 

Also run with and without the night cycle cooling controls.  Equest includes
any night ventilative cooling hours as run hours and thus is likely biasing
your hours under-cooled ...

G

----- Original Message ----- 

From: Keir <mailto:keirh at bluestoneenergy.com>  Howell 

To: bldg-sim at gard.com 

Sent: Wednesday, November 16, 2005 5:39 AM

Subject: [bldg-sim] Out of Throttle Range.

 

If the apartment units have no cooling, then you shouldn't experience any
hours outside of the throttling range because there will be no cooling
setpoint.  Make sure that the cooling temperature schedule (COOL-TEMP-SCH)
for all zones on the second and third floors are undefined.

 

Keir Howell
Bluestone Energy Services, Ltd.
phone:    781-356-8865
fax:    781-356-8864

----- Original Message ----- 

From: Albert Sitorus <mailto:asitorus at glumac.com>  

To: bldg-sim at gard.com 

Sent: Tuesday, November 15, 2005 11:51 AM

Subject: [bldg-sim] Out of Throttle Range.

 

Hello everybody,

 

I am modeling a 3-story building mixed-used LEED building. The first floor
is used as classrooms and retails. The 2nd and 3rd floors are used for
residential units. Most of the systems on the first floor are air-cooled
condensing unit with electric heat-pump heating, and the rest are exhaust
fan systems. For the 2nd and 3rd floors, the apartment units use unit
heaters  without any cooling. Corridors on these floors are served by
make-up air units with gas-fired heating. There is not any warning or error
when I simulate the model. 

 

The problem is that I can't reduce the "percent of hours any system zone
outside of throttling range" to an acceptable value. I have tried adjusting
air flow, throttling range, etc w/o achieving the desired results. I looked
at SS-O report and the problem is there are too many hours when the cooling
isn't satisfied for 2nd and 3rd floor. In other words, for all zones on 2nd
and 3rd floors there are many hours when the units are over 80 - 85F or even
above 85F. I also tweaked the fans night control cycle, infiltration
schedule, set-point temperature, and zone entering max supple temp but the
out of throttling range is still exceptionally high. 

 

I have no idea how to fix this error. Without cooling in these units, should
I not expect such large out of throttling range issues? Has anyone
encountered this kind of problem before? Can anyone share their experience
or solution? Has anyone done LEED model w/o cooling? I would appreciate any
response, idea or hints that would help solve this problem. I have described
the problem as clear as I can but I am sure there are things that I may have
left out, please don't hesitate to ask me. Again, I am trying to get some
ideas, hints or methods so I will provide as much info as anyone want in
order to help me solve this.

 

Thank you very much in advance for your help. I appreciate any help, hints
or suggestions. Thank you again. 

 

Sincerely, 

 

Albert Sitorus. 

 



Albert T. Sitorus
Energy Analyst

 


 <http://www.glumac.com/> 


  _____  


320 SW Washington, Suite 200
Portland, OR 97204-2640
T.  503.227.5280  F. 503.274.7674

Thinking. Inside the building.
www.glumac.com <http://www.glumac.com/>  

 

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