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{"topic": "DF calculated in Radiance and Relux", "category": "radiance-general", "attachments": [], "created_by_name": "<NAME>", "created_at": "March 29, 2008 at 12:21AM", "body": "Dear Radiance Users,\n\n\nIn order to double check the DF which I calculated in Radiance I also calculated these for the exact same room with all the same settings (reflectance, transmittance, dimensions, areas of the pane, reference plance, reductions factor = 1 in Relux and city (Oslo)) in Relux . \n\n\nSurprisingly since Relux is based on Radiance the DF which I calculated in Radiance are about 1.7 higher than the ones calculated in Relux (DF calculated in Radiance = 17 and the ones calculated in Relux = 15,3 0.6m from the facade).\n\n\nI have used the folowing gensky and rtrace command in Radiance:\n\n\ngensky\n6 21 12 -c -a 59.9 -o -10.8 -m -15.00 -B 55.866\n\n\nrtrace -w -h -I+ -ab 20 -aa 0.1 -ad 512 -as 64 -ar 128 DF_OfficeLL.oct\n< DFcoordinates.inp | rcalc -e\n'$1=($1*0.265+$2*0.670+$3*0.065)*179/10000*100' > OfficeLL.log\n\n\nThe same issue arrise when I include external shading (trans) to my model?\n\n\nDoes anybody has any insight of the calculation settings in Relux or have I made a beginners mistake of my input in Radiance?\n\n\nI appreciate any help and comments on this :)\n\n\n\n\nBest regards \n\n\n<NAME>\n\n\n______________________\n\n\n<NAME>,\nGriffenfeldsgade 33, 2.tv\n2200 K\u00f8benhavn N\nDenmark\n\n\n\n\nmobil:  +45 26 39 06 40\nE-mail: perhaugaard at yahoo.dk\n\n\n\n\n\n\n\n\n\n\n      Find din nye laptop p\u00e5 kelkoo.dk. Se de gode tilbud her - http://dk.yahoo.com/r/pat/mm\n___\n<sup>Automatically generated content from [radiance mailing-list](https://radiance-online.org/pipermail/radiance-general/2008-March/004885.html).</sup>", "id": "radiance-general_004885", "created_by": "Per_Haugaard"}