[bldg-sim] Out of Throttle Range.

[Graham & Megan]

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 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 
    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


     

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