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Marcus and Jean, In 90.1, ASHRAE goes give a bit of direction as to the materials that you are required to use in your Baseline Design walls. Reference the "Baseline Building Performance" cell in row 5 of Table G3.1. For the most part, Baseline Design buildings have steel-framed, insulated walls. That means that the wall should be mainly comprised of a material that has the equivalent thermal properties (density, conductivity, and specific heat) of a combination of steel studs and fiberglass batt insulation, appropriately area weighted. The values that we use are: conductivity 0.4 kJ/h.m.K capacity: 0.84 kJ/kg.K density: 490.6 kg/m3 Depending upon the climate zone, there may or may not be a requirement for continuous (rigid foam usually) insulation as well. Other assemblies such as floors, roofs, etc. also have their own construction requirements listed in that same G3.1 table. Best, David On 2/12/2012 04:41, Marcus wrote: Hi Jean, welcome to TRNSYS! I did one LEED project in TRNSYS, but unfortunately I couldn't dig up the constructions files. But it's fairly easy to put together a few centimeters of concrete then add and adjust a massless insulation layer to match the U-value required. This is what I do to get a first approximation. As far as I know, ASHRAE doesn't specify actually constructions for baseline - like what the exact mass should be, except that it should be "light weight". -- *************************** David BRADLEY Principal Thermal Energy Systems Specialists, LLC 22 North Carroll Street - suite 370 Madison, WI 53703 USA P:+1.608.274.2577 F:+1.608.278.1475 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com |