Tube housing assembly heating curve (kJ) 250 200 150 100 50 0 0 30 60 90 120 150 180 210 240 90 120 150 180 210 270 (Min) Tube housing assembly cooling curve (kJ) 250 200 150 100 50 0 0 Operation 2007-09-19 30 60 94 240 270 (Min)