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[TRNSYS-users] Massless Layer



Hi TRNSYS users!
I'm simulating a building and I need to create a massless layer. I've calculate the overall heat transfer coefficient that I need for some "X" wall (6.6581 W/m2K in this case). The massless layer requires a thermal resistance in [hm2K/kJ], which is the reciprocal of the heat transfer coefficient. Doing this, I get R=0.0417203 [m2Kh/kJ]. When I create a wall with this layer (and this R value) the wall type manager shows me an U value of 3.123 [W/m2K] (totaly diferent of the one that I need). Does anyone knows how TRNSYS calculate this? or what is the right unit conversion?
Thanks for your time