Energy Application Noadswood Science, 2011. Energy Application  To use your knowledge of conduction, convection and radiation to explain the design of.

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Presentation transcript:

Energy Application Noadswood Science, 2011

Energy Application  To use your knowledge of conduction, convection and radiation to explain the design of different objects Saturday, May 02, 2015

Heat Transfer  Which materials are best at absorbing / emitting heat energy?  Which are worst at absorbing / emitting heat energy?

Elephants  What is the difference between the Indian and African elephant? Explain this difference considering heat energy… African Indian Mean World Temperature

Elephants  African and Indian elephants live in different climates, with temperature being an important factor (the climate is generally hotter in Africa)  In African elephants the hotter temperature requires them to be able to cool in an effective manner – their large ears help them in doing so…

Elephants  African elephants large ears have many blood vessels running through them – when the temperature is hot blood passes into the ears, and heat is lost to the environment via conduction (increased via flapping)

Energy Circus  There are a number of objects around the room – complete the worksheet individually explaining how each object uses conduction, convection and radiation…

Energy Circus

Thermos Flask  Can you explain how a thermos flask works in terms of energy transfer?  The diagram shows the key concepts: -  Outer cap/cup  Plastic cap filled with cork  Shiny, mirrored surface  Vacuum  Sponge  Air  Plastic case

Thermos Flask  Glass bottle is double-walled with a vacuum between the two walls (stops conduction and convection through the sides)  Walls either side of the vacuum are silvered (reduces radiation)  Bottle is supported by insulating form (minimises conduction to or from the outer glass bottle)  Stopper is made of plastic and filled with cork or foam (reduces conduction)  The whole design minimises any heat loss through conduction, convection or radiation

North Pole  Would a cup of tea get colder quicker at the North Pole or at the equator? Why?!  The bigger the temperature difference between the object and the surroundings, the quicker the object will transfer its heat – at the North Pole there is a greater temperature difference, so this is where it will cool quickest