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Sect 18.3
 

Sect 18.3

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    Sect 18.3 Sect 18.3 Presentation Transcript

    • 6 th Grade Science Chapter 18 Thermal Energy Notes Section 18.3 Chihuly at the New York Botanical Garden
      • What is heat engine?
      • A heat engine converts thermal energy into mechanical energy.
      • What is the Law of Conservation of Energy?
      • No device, including a heat engine, can produce or destroy energy.
      Key Questions 1
      • A heat engine is a device that converts thermal energy into mechanical energy.
      • The engines used in cars, motorcycles, trucks, and other vehicles are heat engines.
      Heat Engines
    • 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.
      • What is an internal combustion engine?
      • Internal combustion engines burn fuel in a combustion chamber inside the engine.
      • What are some types of internal combustion engines?
      • Internal combustion engines include diesel engines, 2 stroke engines, and 4 stroke engines.
      Key Questions 2 The Tadpole Galaxy
      • In internal combustion engines, the fuel burns in a combustion chamber inside the engine.
      Internal Combustion Engines
      • Many machines, including cars, airplanes, buses, boats, trucks, and lawn mowers, use internal combustion engines.
    • Four cycle internal combustion engine
    • Two cycle internal combustion engine
      • What does a refrigerator do?
      • A refrigerator transfers the thermal energy from inside to outside the refrigerator.
      • What does the refrigerator coolant do?
      • The refrigerator coolant absorbs thermal energy from inside the refrigerator.
      Key Questions 3 The Sombrero Galaxy
      • A refrigerator is a heat mover.
      Refrigerators
      • It absorbs heat from the food and other materials inside the refrigerator.
      • Then it carries the heat to outside the refrigerator, where it is transferred to the surrounding air.
      • Liquid coolant is forced up a pipe toward the freezer unit.
      Absorbing Heat
      • The liquid passes through an expansion valve where it changes into a gas.
      • When it changes into a gas, it becomes cold.
      Absorbing Heat
      • The cold gas passes through pipes around the inside of the refrigerator.
      • Because the coolant gas is so cold, it absorbs heat from inside the refrigerator, and becomes warmer.
      • The heat absorbed by the coolant cannot be transferred to the air.
      Releasing Heat
      • The warm coolant gas then passes through a compressor that compresses the gas.
      • When the gas is compressed, it becomes warmer than room temperature.
      • The gas then flows through the condenser coils, where it transfers heat to the cooler air in the room.
      Releasing Heat
      • As the coolant gas cools, it changes into a liquid.
      • The liquid is pumped through the expansion valve, changes into a gas, and the cycle is repeated.
      • How does an air conditioner work?
      • Most air conditioners work in the same way that a refrigerator does.
      • What does a heat pump do?
      • A heat pump absorbs thermal energy from the air outside, and transfers it inside.
      Key Questions 4
    • 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.
      • A heat pump moves heat from one place to another.
      Heat Pumps
      • In heating mode, the coolant absorbs heat through the outside coils.
      • Diagram the movement of coolant and the flow of heat when a heat pump is used to cool a building. Pg 537
      • Explain why diesel engines don’t use spark plugs.
      • Identify the source of thermal energy in an internal combustion engine.
      • Determine if you could cool a kitchen by keeping the refrigerator door open.
      • Describe how a refrigerator uses a coolant to keep the food compartment cool.
      Questions Section 18.3