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Re: [EnergyPlus_Support] Infiltration input



I know it was planned to create an information transfer from the DesignBuilder CFD simulation to assign the wind pressure coeffs (WPC) to the surfaces of the e+ model, but I don't know if the developement is that far. The last state I know of uses an English standard algorithm for the auto assignation of WPCs similar to that inherent option in e+. Warning here...it assumes a standard cuboid building to about 6 floors and limited aspect ratios...this means you'll have to overwrite for inner courtyards, etc.


On 30 August 2013 21:51, Edward G. Lyon <eglyon@xxxxxxx> wrote:
 

My understanding of the DesignBuilder implementation of air infiltration testing data is that the input is used to assign constant infiltration rates to each zone of the building based on exterior  area.  The referenced standard is clear that this is a maximum infiltration to all zones intended for sizing heating equipment.  It may not be doing what you want for a whole year energy simulation.

 

If you want a whole year simulation, you need to create an AirflowNetwork model.  I am working on the same thing for a larger building where I know my envelope infiltration is different for the main building areas than it is for areas in and adjacent to the roof.  I plan to define leakage rates for the perimeter of the windows and cracks in the attic such that total leakage equals my test leakage at a given pressure.  The AirflowNetwork should then be able to calculate infiltration based on weather file data.  You can do the same from DesignBuilder and use CFD to assign pressure coefficients, but it is not as simple as just entering your test results to one input.  

 

Ned Lyon, P.E. (MA, WV)
Staff Consultant

SIMPSON GUMPERTZ & HEGER
781.907.9000 main
781.907.9350 direct 
617.285.2162 mobile 
781.907.9009 fax
www.sgh.com

 

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of georgiou.geo13@xxxxxxxxx
Sent: Friday, August 30, 2013 3:30 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Infiltration input

 

 

Dear group,

 

I have carried out an infiltration test at a house and I want to upload the results on my model. However, when I developed the model I also include the basement of the building which is not taken in account during the infiltration test. When I am setting the value in ACH at DesignBuilder, the basement is included. Does anybody know how can I set the value that I measured for the whole building to represent particular zones of the model? (DesingBuilder or EnergyPlus) 

 

Best Regards




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