The class includes 40 people. Heat loss from the walls of the class, including the glass windows, is negligible. A flow of cold air enters the classroom via the main entrance, flows in the classroom,...

The class includes 40 people. Heat loss from the walls of the class, including the glass windows, is negligible. A flow of cold air enters the classroom via the main entrance, flows in the classroom, and then leaves through an emergency exit door located at the back of the class. Both the entrance door and the emergency exit door have the same dimensions of 1.2 m length and 1.9 m height. Assuming steady-state heat transfer upon reaching the room temperature at a constant value:
(a) If cold air enters the room at 20 °C, the heat generated due to the metabolism of a student/lecturer is 70 W, and air flow rate through both doors is 0.05 m/s, determine the room temperature.

b)how accurate was the prediction you made above? Include factors which may be lead to an inaccurate calculation in the part a