Q2 Two 400W fans are switched on in a perfectly-insulated, closed room at atmospheric pressure and a temperature of 18°C. If the fans operate continuously and the room is 5m x

6m with 3.5m high ceiling. Assuming that the specific gas constant and specific heat capacity of air at a constant volume are 287 J/kg.K and 717 J/kg.K respectively: (a) Calculate the temperature of the air in the room after 2 hours, stating all of the assumptions made. [15/20 marks] (b) What would be the temperature of the room if there was a heat loss through the walls of 750 W throughout the two hours? [5/20 marks]