[TRNSYS-users] HELP making new orientations in type 56

[David Bradley]

Marshall,
> I am trying to create a pitched roof for a building (a wall that has a 
> slope).  I have created two new orientations, NSLOPE and SSLOPE, in 
> TRNBUILD.  Then I created two new surfaces in the input for weather 
> data (type 109).  This created 6 new output variables for each of the 
> new surfaces.  How do I go about connecting these outputs from the 
> weather reader to the input of type 56?  Can I create a connection 
> between the weather reader and the type 56 and connect the variables?
once the new surfaces are defined in Type109, right click on your Type56 
in the Studio and tell it to "update building variable list." You should 
have three new inputs for each orientation that you defined in TRNBuild. 
Then either open an existing connection between Type109 and Type56 or 
make a new one and connect the appropriate output and input variables as 
you would between any two TRNSYS types.
> Also what are the input variables labeled "CNAT_1" for type 56?
that is not a standard input to Type56 so it pertains to something that 
you defined in TRNBuild (or something that was already defined in the 
*.bui from which you began). Look through the various managers in 
TRNBuild to determine where that input is being used.
> I am also modeling my building with a crawlspace underneath the first 
> floor.  What is the best way to model the natural earth (dirt) floor 
> of the crawl space?  Should I create a layer that is similar to rock 
> or dirt and declare it as a boundary wall?  I've tried using the 
> gravel_sand layer from the library and the dirt floor but when I 
> declare it as a boundary I always get an error.
The most correct method would be to define a layer of earth (perhaps 
10cm of it) as a BOUNDARY wall for the bottom and define whatever the 
walls are (concrete perhaps) also as BOUNDARY walls, then connect those 
to one of the basement ground coupling models in the TESS Ground 
Coupling Library (if you have access to it.) Without that library, you 
can use the ASHRAE f-Factor approach to estimating the effective 
resistance of the earth but that method is not all that accurate as has 
been shown in some recent work by the IEA.

Kind regards,
 David

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Thermal Energy System Specialists (TESS), LLC 
David BRADLEY                      22 N. Carroll Street - Suite 370 
Partner                            Madison, WI 53703 
                                   USA
P: +1.608.274.2577 
F: +1.608.278.1475
E-mail: bradley at tess-inc.com 
Web Pages:  http://www.tess-inc.com    and      http://www.trnsys.com

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