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Heat Transfer.

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Presentation on theme: "Heat Transfer."— Presentation transcript:

1 Heat Transfer

2 Essential Questions: What methods can be used to demonstrate thermal energy transfers? What are conduction, convection, and radiation, including examples?

3 Conduction, Convection and Radiation
Thermal Energy Energy that is generated by a source Total kinetic energy of particles Measured by temperature (the average kinetic energy of particles) Can be transferred heat Kinetic energy of an object is the energy that it possesses due to its motion. Chemical energy is energy stored in the bonds of chemical compounds (atoms and molecules). It is released in a chemical reaction, often producing heat as a by-product (exothermic reaction). Batteries, biomass, petroleum, natural gas, and coal are examples of stored chemical energy. © KeslerScience.com

4 Conduction, Convection and Radiation
3 Ways Thermal Energy can be Transferred by heat Conduction Convection Radiation Have a pan of water boiling in the room. Discuss the three types of energy transfer using this as an example. © KeslerScience.com

5 Conduction, Convection and Radiation
The movement of heat, once heated through radiation Solids are good conductors, particularly metals © KeslerScience.com

6 Conduction, Convection and Radiation
Examples of Conduction – (direct contact) Touching a metal spoon in a cup of hot liquid Putting a heating pad on your back Feeling the heat from a hot poker that was in a fire place Placing a hand on top of a basket of hot rolls © KeslerScience.com

7 Conduction, Convection and Radiation
The transfer of thermal energy though a fluid (gas or liquid) that has already been heated through radiation Due to differences in density Hot fluid (less dense) rises while cold fluid (more dense) sinks. Red (hot) rises Stop and discuss the difference in densities between hot and cold fluids. Blue (cold) sinks © KeslerScience.com

8 Conduction, Convection and Radiation
Examples of Convection –(hot rising/cold sinking) Macaroni rising and falling in a pot of boiling water Lava lamp rising and sinking Hot magma rising in the mantle, cold sinking Hot air rising in the atmosphere, cold sinking (convection cell causing wind) Hot water rising in the oceans, cold sinking Red (hot) rises Blue (cold) sinks © KeslerScience.com

9 Conduction, Convection and Radiation
Travels through space and other types of matter The initial transfer of thermal energy. Energy transmitted in waves or a stream of particles called Photons © KeslerScience.com

10 Conduction, Convection and Radiation
Examples of Radiation - (waves or particles of energy called photons) Laying out in the sun at a beach Holding your hand over a burning match without touching it Feeling the warmth of a bonfire Holding your hands over a light bulb © KeslerScience.com

11 1. Describe the heat transfer in this picture: 2
1. Describe the heat transfer in this picture: 2. Describe the heat transfer in the wind, the Earth’s oceans, and in the Earth’s mantle. 3. Describe how sunburns are related to heat transfer. Have students complete this template either with a partner or individually. Let’s see if they can apply their learning.

12 Demonstrate a way to explain thermal energy transfers?
Can you… Demonstrate a way to explain thermal energy transfers? Define conductions, convection and radiation and give examples? © KeslerScience.com

13 Determining Thermal Energy (heat)
Q = mc∆T, where Q = heat energy, m = mass, and ∆T = change in temp. c= specific heat constant ∆T = (Tfinal – Tinitial) The SI unit for thermal energy is the Joule (J) © KeslerScience.com

14 How many joules of heat are needed to raise the temperature of 47
How many joules of heat are needed to raise the temperature of 47.5 g of aluminum from 21C to 94C, if the specific heat of aluminum is 0.90 J/g C? © KeslerScience.com

15 What is the specific heat of silver metal if 55
What is the specific heat of silver metal if g of the metal absorbs J of heat and the temperature rises 15.0C? © KeslerScience.com

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