[BLDG-SIM] DOE2.1e Sunspace

[Graham & Megan]

Without knowing more details, it is hard to say.  You might want to check what your floor is doing.  If you have slab on grade, you need to make an adjustement to the effective area and U-Value in contact with the ground.  There are some 2.1E supplements that cover this.  If you don't make this adjustment you can end up sucking heat from the space into the slab and end up with a heating load ...
Regards,
Graham
  ----- Original Message ----- 
  From: Bill Talbert 
  To: BLDG-SIM at GARD.COM 
  Sent: Friday, November 07, 2003 3:35 AM
  Subject: [BLDG-SIM] DOE2.1e Sunspace


  Hello,
  I am working on a model of a lab building with a two-story corridor along the east facade of the building. There is a large wall of glazing on the east side and an opening between the floors to allow for natural ventilation. I am attempting to model a vented sunspace using DOE2.1e (using a Residential System with hot water heat - RESYS) in order to take advantage of the mass wall along the west side of the corridor. There is no direct venting to the surrounding zones (only free circulation from the lower to the upper level with louvered openings to the outside on each floor). The output file is indicating negative cooling energy use for the sunspace system. There are two other systems that require mechanical cooling, but the negative cooling energy in the sunspace is offsetting this energy use which results in a negative overall value for the building. My first thought was that heat transfer from the sunspace was cooling the surrounding zones, but the zones with mechanical cooling are not directly adjacent to the sunspace and have high internal loads. Does anyone have any experience with this situation? I would appreciate any assistance.
  Thanks,


  Bill Talbert
  Mechanical Engineer
  USGBC LEED Accredited Professional
  Affiliated Engineers, Inc.


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