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Knowledgebase : Materials and Constructions

1. For radiant barriers which are exposed to a thermal zone, such as an attic space, specify a reduced thermal absorptance for the innermost material layer. For example, an attic roof construction might be (outer to inner) Asphalt shingles, R-30 in...
In the Engineering Reference, there is a section named "Outside Surface Heat Balance"... which contains a subsection named "External Longwave Radiation": External Longwave Radiation q"LWR is a standard radiation exchange formulation between the surfac...
Q: I would like to know how E+ is calculating the emissivity of materials (not the glazing ones). I am guessing it is an indirect proceedure, as there is no specific input field for this subject. A: In EnergyPlus input there are three different wav...
Question: would you tell me please in which document or book or website i can find material's characteristic such as u value, density, and conductivity Answer: There's an entire database of materials and constructions (from ASHRAE and other sources...
Question: I am working with energy plus in sketchup on the quest for one model. What I am trying to do is to trace the external geometry from a 3d daylighting model and to build my energy plus model and then apply thicknesses internally afterwards t...