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Heat Exchange. HOW IS THERMAL ENERGY TRANSFERRED? 3 MECHANISMS: CONDUCTION CONDUCTION CONVECTION CONVECTION RADIATION RADIATION.

Published bySherman Welch Modified over 8 years ago

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Presentation on theme: "Heat Exchange. HOW IS THERMAL ENERGY TRANSFERRED? 3 MECHANISMS: CONDUCTION CONDUCTION CONVECTION CONVECTION RADIATION RADIATION."— Presentation transcript:

1 Heat Exchange

2 HOW IS THERMAL ENERGY TRANSFERRED? 3 MECHANISMS: CONDUCTION CONDUCTION CONVECTION CONVECTION RADIATION RADIATION

3 HOW IS THERMAL ENERGY TRANSFERRED? CONDUCTION – collisions of particles within a system due to a difference in temperature.

4 HOW IS THERMAL ENERGY TRANSFERRED? CONVECTION – current within a fluid (i.e. water or air) caused by the rising of hotter fluid and the falling of cooler fluid. The mixture of two fluids of different temperature

5 HOW IS THERMAL ENERGY TRANSFERRED? RADIATION – excitement (increased KE) of particles due to absorption Electromagnetic Waves.

6 Temperature Scales

7 Absolute Zero O K or -273.15 °C is the lowest possible temperature °C to K  [K] = [°C] + 273.15 ΔT in K = ΔT in °C Theoretical state in which particles have no energy at all.

8 Absolute Zero O K or -273.15 °C is the lowest possible temperature °C to K  [K] = [°C] + 273.15 Theoretical state in which particles have no energy at all. Quantum gas goes below absolute zero? Quantum gas goes below absolute zero?

9 Consider this scenario We have two containers filled with 200 g of 20 °C water. 50 g of aluminum @ 100 °C is placed in one container and 50 g copper @ 100 °C is placed in the other. How will their Equilibrium Temperatures compare? 20 °C Al Cu 20 °C

10 Consider this scenario We have two containers filled with 200 g of 20 °C water. 50 g of aluminum @ 100 °C is placed in one container and 50 g copper @ 100 °C is placed in the other. Heat lost by the hotter metals will be equal in magnitude to the Heat absorbed by the cooler water Qloss + Q gain = 0 20 °C Al Cu 20 °C

11 Consider this scenario We have two containers filled with 200 g of 20 °C water. 50 g of aluminum @ 100 °C is placed in one container and 50 g copper @ 100 °C is placed in the other. Using Qloss + Q gain = 0 Let’s calculate the equilibrium temperature for each scenario. 20 °C Al Cu 20 °C

12 . What is the equilibrium temperature? 50 g of aluminum @ 100 °C is placed in 200 g of 20 °C water (C of water = 4180 J/(kg K) and C of Al = 897 J/(kg K)). What is the equilibrium temperature? In a closed, isolated system, ΔE=0 In a closed, isolated system, ΔE=0 or or Q loss + Q gain = 0 Al 20 °C 100 °C 20 °C 50g Al 200 g water

13 Exit Ticket By show of fingers indicate: 1) Radiation2) Conduction3) Convection (A) (B) (C)

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