6 th  Grade Science  Chapter 18 Thermal Energy Notes Section 18.3 Chihuly at the New York Botanical Garden
<ul><li>What is heat engine? </li></ul><ul><li>A heat engine converts thermal energy into mechanical energy.  </li></ul><u...
<ul><li>A  heat engine  is a device that converts thermal energy into mechanical energy.   </li></ul><ul><li>The engines u...
A steam engine is one of the earliest heat engines. A fire box heats steam. The steam drives a piston that is connected to...
<ul><li>What is an internal combustion engine? </li></ul><ul><li>Internal combustion engines burn fuel in a combustion cha...
<ul><li>In  internal combustion  engines, the fuel burns in a combustion chamber inside the engine.  </li></ul>Internal Co...
Four cycle internal combustion engine
Two cycle internal combustion engine
<ul><li>What does a refrigerator do? </li></ul><ul><li>A refrigerator transfers the thermal energy from inside to outside ...
<ul><li>A refrigerator is a heat mover. </li></ul>Refrigerators  <ul><li>It absorbs heat from the food and other materials...
<ul><li>Liquid coolant is forced up a pipe toward the freezer unit.  </li></ul>Absorbing Heat   <ul><li>The liquid passes ...
<ul><li>When it changes into a gas, it becomes cold.   </li></ul>Absorbing Heat   <ul><li>The cold gas passes through pipe...
<ul><li>The heat absorbed by the coolant cannot be transferred to the air.  </li></ul>Releasing Heat <ul><li>The warm cool...
<ul><li>The gas then flows through the condenser coils, where it transfers heat to the cooler air in the room.   </li></ul...
<ul><li>How does an air conditioner work? </li></ul><ul><li>Most air conditioners work in the same way that a refrigerator...
Opened in November 2005, the indoor resort features an 60-meter high indoor mountain with 5 slopes of varying steepness an...
<ul><li>A heat pump moves heat from one place to another. </li></ul>Heat Pumps   <ul><li>In heating mode, the coolant abso...
<ul><li>Diagram the movement of coolant and the flow of heat when a heat pump is used to cool a building. Pg 537 </li></ul...
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Sect 18.3

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Sect 18.3

  1. 1. 6 th Grade Science Chapter 18 Thermal Energy Notes Section 18.3 Chihuly at the New York Botanical Garden
  2. 2. <ul><li>What is heat engine? </li></ul><ul><li>A heat engine converts thermal energy into mechanical energy. </li></ul><ul><li>What is the Law of Conservation of Energy? </li></ul><ul><li>No device, including a heat engine, can produce or destroy energy. </li></ul>Key Questions 1
  3. 3. <ul><li>A heat engine is a device that converts thermal energy into mechanical energy. </li></ul><ul><li>The engines used in cars, motorcycles, trucks, and other vehicles are heat engines. </li></ul>Heat Engines
  4. 4. A steam engine is one of the earliest heat engines. A fire box heats steam. The steam drives a piston that is connected to a drive shaft. The drive shaft is connected to the wheels of the train.
  5. 5. <ul><li>What is an internal combustion engine? </li></ul><ul><li>Internal combustion engines burn fuel in a combustion chamber inside the engine. </li></ul><ul><li>What are some types of internal combustion engines? </li></ul><ul><li>Internal combustion engines include diesel engines, 2 stroke engines, and 4 stroke engines. </li></ul>Key Questions 2 The Tadpole Galaxy
  6. 6. <ul><li>In internal combustion engines, the fuel burns in a combustion chamber inside the engine. </li></ul>Internal Combustion Engines <ul><li>Many machines, including cars, airplanes, buses, boats, trucks, and lawn mowers, use internal combustion engines. </li></ul>
  7. 7. Four cycle internal combustion engine
  8. 8. Two cycle internal combustion engine
  9. 9. <ul><li>What does a refrigerator do? </li></ul><ul><li>A refrigerator transfers the thermal energy from inside to outside the refrigerator. </li></ul><ul><li>What does the refrigerator coolant do? </li></ul><ul><li>The refrigerator coolant absorbs thermal energy from inside the refrigerator. </li></ul>Key Questions 3 The Sombrero Galaxy
  10. 10. <ul><li>A refrigerator is a heat mover. </li></ul>Refrigerators <ul><li>It absorbs heat from the food and other materials inside the refrigerator. </li></ul><ul><li>Then it carries the heat to outside the refrigerator, where it is transferred to the surrounding air. </li></ul>
  11. 11. <ul><li>Liquid coolant is forced up a pipe toward the freezer unit. </li></ul>Absorbing Heat <ul><li>The liquid passes through an expansion valve where it changes into a gas. </li></ul>
  12. 12. <ul><li>When it changes into a gas, it becomes cold. </li></ul>Absorbing Heat <ul><li>The cold gas passes through pipes around the inside of the refrigerator. </li></ul><ul><li>Because the coolant gas is so cold, it absorbs heat from inside the refrigerator, and becomes warmer. </li></ul>
  13. 13. <ul><li>The heat absorbed by the coolant cannot be transferred to the air. </li></ul>Releasing Heat <ul><li>The warm coolant gas then passes through a compressor that compresses the gas. </li></ul><ul><li>When the gas is compressed, it becomes warmer than room temperature. </li></ul>
  14. 14. <ul><li>The gas then flows through the condenser coils, where it transfers heat to the cooler air in the room. </li></ul>Releasing Heat <ul><li>As the coolant gas cools, it changes into a liquid. </li></ul><ul><li>The liquid is pumped through the expansion valve, changes into a gas, and the cycle is repeated. </li></ul>
  15. 15. <ul><li>How does an air conditioner work? </li></ul><ul><li>Most air conditioners work in the same way that a refrigerator does. </li></ul><ul><li>What does a heat pump do? </li></ul><ul><li>A heat pump absorbs thermal energy from the air outside, and transfers it inside. </li></ul>Key Questions 4
  16. 16. Opened in November 2005, the indoor resort features an 60-meter high indoor mountain with 5 slopes of varying steepness and difficulty, including a 400-metre-long run, the world's first indoor black run, and a 90-metre-long quarter pipe for snowboarders. A quad lift and a tow lift carry skiers and snowboarders up the mountain. Adjoining the slopes is a 3,000-square-metre Snow Park play area comprising sled and toboggan runs, an icy body slide, climbing towers, a snowball shooting gallery, an ice cave and a 3D theatre. Other attractions include a mirror maze and a snowman-making area. Winter clothing, ski and snowboard equipment are included.
  17. 17. <ul><li>A heat pump moves heat from one place to another. </li></ul>Heat Pumps <ul><li>In heating mode, the coolant absorbs heat through the outside coils. </li></ul>
  18. 18. <ul><li>Diagram the movement of coolant and the flow of heat when a heat pump is used to cool a building. Pg 537 </li></ul><ul><li>Explain why diesel engines don’t use spark plugs. </li></ul><ul><li>Identify the source of thermal energy in an internal combustion engine. </li></ul><ul><li>Determine if you could cool a kitchen by keeping the refrigerator door open. </li></ul><ul><li>Describe how a refrigerator uses a coolant to keep the food compartment cool. </li></ul>Questions Section 18.3

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