Please take your notebook out and take your hats off Science 14 and 10-4 with Mrs. Martin 5.5 Heat Transfer Technologies.

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Presentation transcript:

Please take your notebook out and take your hats off Science 14 and 10-4 with Mrs. Martin 5.5 Heat Transfer Technologies

Agenda Review Notes on 5.5 Heat Transfer Technologies – Liquid coolant in engines – Refrigerators Videos

Review Particle Model of Matter says: – All matter is made up of small particles. – All particles are in constant motion. What is this jiggling or vibrating motion called?

Review Brownian motion is the jiggling or vibrating of particles As the temperature increases what happens to the movement of the particles? Temperature is the average of all kinetic energies (motion).

Review Give an example of: Convection – hot liquid or gas rises Conduction – direct contact heat transfer Radiation – travels in rays or waves

Heat Transfer Technologies Convection ovens use a fan to move the air in convection currents

Getting Rid of the Heat Engines get hot because fuel combustion releases heat Vehicles need to remove heat to protect the engine If the engine doesn’t cool properly, it overheats and explodes like this: bNIpM bNIpM

Video

Coolant Heat is conducted from the engine to the liquid coolant, which is pumped to the radiator

Radiator Metal alloy is a good conductor Heat from the liquid is conducted through this alloy to the air Either a fan or the motion of a vehicle forces the heat from the radiator into the air

Extra time? Video on how an engine works and is cooled: – – New technology

Evaporation When you sweat, it is so that the water can evaporate to cool your body Water absorbs the heat and removes it when it evaporates into the air

Like liquid coolant in an engine, a refrigerator uses refrigerant as coolant. Coolant circulates through the pipes Refrigeration

Heat from the hot food goes to the cold refrigerator air The coolant evaporates as it gets warmer It is pumped to the compressor and is converted back to a cool liquid The heat is released to the room

How does leaving the fridge door make the room warmer?

What happens when cooling fails? What happens if the electricity goes out in a nuclear power plant? – – (short on time go to 2:55-4:15) Nuclear reactor meltdown from cooling malfunction on the NEWS: –

Quick Quiz #2 ___________ #1 ___________ #3 ___________

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