[Bldg-sim] "Qualified" energy modeling tools for LEED NC v2.2

[Timothy McDowell]

TRNBuild is a front-end program that allows for the input of the
parameters of Type56 in a more user-friendly manner.  Type56 is the TRNSYS
type which does the actual calculations.

Regards,

Tim





----------------------------------
Timothy McDowell
Executive Vice President
Thermal Energy System Specialists, LLC
2916 Marketplace Dr, Suite 104
Madison, WI 53719
Phone: 608-274-2577
Fax: 608-278-1475

----- Original Message -----
From: "Zhai Chaoqin" <crithy at gmail.com>
Sent: Fri, August 1, 2008 10:13
Subject:Re: [Bldg-sim] "Qualified" energy modeling tools for LEED NC v2.2


Do Type56 and TRNBuild refer to the same thing?
On Fri, Aug 1, 2008 at 10:35 AM, Timothy McDowell <mcdowell at tess-inc.com>
wrote:
Chaoqin -There is not a CAD interface for Type56.  TRNBuild is a program
thatallows you to define your zones and enter the wall and window areas
anddefine orientations and adjacencies of the walls, along with defining
yourinternal gains, infiltration flows, ventialtions flows, etc.
Regards,Tim----------------------------------Timothy McDowellExecutive
Vice President
Thermal Energy System Specialists, LLC
2916 Marketplace Dr, Suite 104Madison, WI 53719Phone: 608-274-2577Fax:
608-278-1475----- Original Message -----From: "Zhai Chaoqin"
<crithy at gmail.com>
Sent: Fri, August 1, 2008 9:04Subject: Re: [Bldg-sim] "Qualified" energy
modeling tools for LEED NC v2.2


David,I am not familiar with TRNBuild. Does it have a built-in CAD
interfacethat one can draw a building? Can one define building surfaces
bycoordinates? Can one import a 2-D or 3-D CAD drawing? As I recall
inType56, one needs to pre-calculate the wall and window areas
byorientation for each zone and input the area value into TRNSYS. I am
notsure if this is still the case.Thanks,ChaoqinOn Fri, Aug 1, 2008 at
9:43 AM, David Bradley <bradley at tess-inc.com> wrote:Chaoqin, There are
three parts to the geometry issue. For internal radiation exchange, you
are correct that TRNSYS is anon-geometrical model and that two surfaces do
not have any knowledge oftheir mutual view factor. Like many of the other
building models outthere, TRNSYS uses a star-network in which each surface
"radiates" tothe air node and vice versa. For external geometry, one
defines orientations in the buildingprocessor (TRNBuild) and then defines
corresponding surfaces (slope andazimuth) in the weather data reader.
Solar radiation from a particularweather data reader surface is then
linked to the appropriate Type56inputs for each orientation defined in
TRNBuild. For external shading (including building self-shading), one
places aseries of wingwall and overhang components between the unshaded
solarradiation calculated by the weather data reader and the building,
ineffect cutting down on the amount of radiation incident on the
building.It is a flexible methodology but a bit of a cumbersome one. One
of themain pushes in the current development of TRNSYS 17 is a much
moreautomated methodology for doing building self-shading. The
Type56developers are also working on a true view-factor methodology
forinternal radiation exchange within a zone.Kind regards,
David**************************************David BRADLEY -
PrincipalThermal Energy System Specialists, LLC2916 Marketplace Drive -
suite 104Madison, WI  53719USAPh: +1.608.274.2577Fx:
+1.608.278.1475bradley at tess-inc.comhttp://www.tess-inc.comhttp://www.trnsys.com**************************************


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