[BLDG-SIM] Space Cooling Question

Graham & Megan hamnmegs at ozemail.com.au
Fri Sep 1 18:28:48 PDT 2006


Not sure what your ECONO-LOW-LIMIT is defaulting to, but this could lock out the economiser thus creating system cooling loads in winter.
  ----- Original Message ----- 
  From: Daniel Birleanu 
  To: BLDG-SIM at GARD.COM 
  Sent: Wednesday, August 30, 2006 5:52 AM
  Subject: [BLDG-SIM] Space Cooling Question


  Hello,

   

  I'm modeling a multistory office building located in New York using eQUEST. The building has a heated basement (no cooling) and six conditioned floors (heating and cooling). Cooling is done via air-cooled DX units and a packaged VAV with reheat distribution system. Heating is done using boilers and a hot water loop feeding the reheat coils in the VAV box and baseboards along the perimeter. The schedules are eQUEST defaults. I am not sure what I am doing wrong, but I am getting a significant cooling load in winter. I am using OA temperature controlled economizer and compressor lock-out.

   

  One other strange thing that happens with this model is that both fan energy and demand go up in the winter. One should think that in the heating mode the airflow is set to minimum and the temperature is varied to meet the load. Therefore the fan energy and demand should be lower in the winter. However, the numbers I am seeing show that the demand for the fans is about 50% higher in the winter and the fans energy use in January is almost 4 times higher than the one in August. I have played with the night controls for the fans, but that does not help. If I select the "Stay Off" control instead of "Cycle On Any" I am getting rid of the cooling in the winter, but I am getting weird heating numbers in the summer. In June and August I get some gas use (???) for space heating, but none in July. I do not know what I am missing, but this does not seem right.

   

  Did anyone encounter these or similar issues? Any input will be highly appreciated. Please let me know if you need more details.

   

  Thank you,

  Dan

   

  _____________________________________

   

  Dan Birleanu

  Project Manager

  Energy & Resource Solution, Inc. (ERS)

  13 Railroad Square, Suite 504

  Haverhill, MA 01832

  Tel: 978-521-2550 x265

  Fax: 978-521-4588

  Email: dbirleanu at ers-inc.com

  Web: www.ers-inc.com

  _____________________________________

   


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