Hi the truth is out there :-).. écotect is actually using a dynamic simulation that uses a value for a building with ligth and heay materials Ecotect chooses one of the values depending on the responsfactor.
To cal culate see here I actually made a excel sheet for values in Ecotect. But you can see the formula here.. Its really the key for having the rigth temperature cal http://www.pilkington.com/resources/solargainfacto
I would like to eksplain it in more detail send me an email..
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