Steam circulates through a pipe at 30 bar and unknown temperature Tl. To determine Tl, an isolated tank with a volume of 2 m3 is attached to the line. The reservoir initially contains saturated steam at 1.0 bar. The valve connecting the tank and the pipe is then opened and the tank is filled to a pressure of 20 bat. At this instant the thermometer inside indicates 360 C. Determine the value of Tl if it is estimated that 397 kJ of heat is lost.