zurich-heizzentrale.ac material Fenster1 /sim/time/sun-angle-rad 1.57 0.5 0.5 0.3 material Fenster2 /sim/time/sun-angle-rad 1.57 0.5 0.5 0.3 material Fenster3 /sim/time/sun-angle-rad 1.57 0.5 0.5 0.3 material Fenster4 /sim/time/sun-angle-rad 1.57 0.5 0.5 0.3 material Heizkessel /sim/time/sun-angle-rad 1.57 0.0 0.0 0.5