Heat Diagram of H2O

Heat Diagram of H2O

Heat Diagram of H2O

Questions Regarding the Phase Diagram

• 1. The phase of water present along "Leg A" of the diagram is: – ? vapor– ? solid– ? Liquid

• 2. The phase change taking place, in the right-to-left direction, along Leg "B" is: – ? melting– ? boiling– ? freezing

Questions Regarding the Phase Diagram

• 3. According to the diagram, during a phase change the temperature: – ? increases– ? remains constant– ? Fluctuates– ? decreases

• 4. At normal atmospheric pressure, water boils at: – ? 100 ºC– ? 0 ºC– ? -20 ºC– ? 120 ºC

Questions Regarding the Phase Diagram

• 5. The phase of water present along "Leg E" of the diagram is: – ? solid– ? vapor– ? liquid

• 6. According to the diagram, freezing requires – ? absorption of energy– ? no energy change– ? removal of energy

The Refrigeration Cycle

Energy Interchange in a Refrigerator’s Cooling Cycle

• Heat is taken in from the inner compartment as the Refrigerant (liquid) evaporates in the pipes (Evaporator) and changes phase to vapor.

• The vapor is compressed and then pumped through a heat exchanger pipe assembly (Condenser) where heat is given up to the outside environment allowing the vapor to condense into liquid.