Chapter 1 Basics of Heat Transfer1-22CWarmer. Because energy is added to the room air in the form of electrical work. 1-23CWarmer. If we take the room that contains the refrigerator as our system, we will see that electrical work is supplied to this room to run the refrigerator, which is eventually dissipated to the room as waste heat. 1-24CMass flow rate is the amount of mass flowing through a cross-section per unit time whereas the volume flow rate is the amount of volume flowing through a cross-section per unit time. They are related to each other by where ρis density. &m&V&&mV=ρ1-25 Two identical cars have a head-on collusion on a road, and come to a complete rest after the crash. The average temperature rise of the remains of the cars immediately after the crash is to be determined. Assumptions1 No heat is transferred from the cars. 2 All the kinetic energy of cars is converted to thermal energy.
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