Start with familiar examples Well-sealed and Well-sealed and well-insulated room well-insulated room Fan 洞日 What will happen to the average What if we operated a fan temperature of air in the room? in this room instead? 上游充通大 March 7,2018 3 SHANGHAI JLAO TONG UNIVERSITYMarch 7, 2018 3 Start with familiar examples What will happen to the average temperature of air in the room? What if we operated a fan in this room instead?