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Re: [TRNSYS-users] TRNBUILD Type 56 crawl spaces
Franck,
Crawlspaces are usually accounted for in one of two ways.
The simplest way is to define a zone for the crawlspace and to make the
floor in the zone above into an "ADJACENT" type wall. Energy transfer
through the walls of the crawlspace is then calculated by defining BOUNDARY
walls that contain whatever material forms the walls and floor of the
crawlspace (usually concrete) and an effective, massless equivalent
insulation to account for the soil. The temperature on the back side of the
BOUNDARY walls is usually calculated using the Kasuda ground temperature
correlation (Type77).
The more complex (but arguably more correct) approach is to use a ground
coupling component such as the ones in the TESS Ground Coupling Library.
These components define a volume of soil surrounding the crawlspace on its
four sides and bottom, breaking the volume up into finite elements called
nodes. At each TRNSYS iteration, the models take the Type56 calculated
surface temperature of the walls and floor of the crawlspace zone as
inputs. They perform a 3 dimensional finite element energy balance on the
nodes in the near-field and return the temperature of the crawlspace
wall/soil boundary to Type56. The near-field is surrounded by a far-field
that acts as an infinite energy source / sink. Far field soil temperature
are governed by depth and time of year.
Kind regards,
David
At 09:08 7/3/2006, franck clottes wrote:
Hi,
How to take into account floors with crawl spaces in trnbuild?
Best regards,
F.C.
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