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[EnergyPlus_Support] Absorptance

Dear E+ User
By definition, solar absorptance defines the shortwave absorptance of a
material. This value differs between materials and colours: a black
surface represents a value of one. As in the Blast and DOE material
libraries almost all entries show quite high values, except for metal, I
assume surface colours are meant to be rather dark.
Although IR emittance changes with material and colour- and so must IR
absorptance, all entries in the material library show values of 0.9 for
IR absorptance. Is there a reason for such a definition. 
Further, general material data bases only specify the solar absorptance
properties but not the thermal ones. What is the data source for the
Blast and DOE materials found in the E+ DataSet folder?
DI (FH) Alexander Beisteiner
Wissenschaftlicher Mitarbeiter
Forschungs- und Technologietransfer Pinkafeld GmbH
Steinamangerstraße 21 
A - 7423 Pinkafeld
Tel.: +43-3357-45370 DW 1324
Fax.: +433357-45370 DW 1010

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