Build a Scilab simulation

I am searching for someone who is experienced with the Simulation software "SciLab" and XCos. I need a simple sci-lab simulation of a room heating up. known inputs: room 8 meter x 4 meter x 2.5 meter window 1.5 meter x 2 meter k window 5.8 W/m2 outside temp 5 Celsius inside starting temp 5 Celsius temp goal 21 Celsius the room warms up in 45 minutes needed: power of heater value m value c graph of room heating up (time/temp) graph of room cooling down (heater shut off) (time/temp)