Question:
It is for grade 12 physics on heat exchange between materials.
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Countless possibilities:
1. The relative importance of different heat transfer mechanisms: radiation, conduction, convection, and phase transitions.
The importance of convection is hard to overestimate:
A. consider a long test tube filled with ice. Apply a bunsen burner to the bottom and the whole tube will melt and then boil. Apply the bunsen burner to the top portion and the top will melt and boil while the bottom stays frozen.
B. take a look at this demo:
http://www.youtube.com/watch?v=QBVMm9i-pvo
C. consider heat pipes.
http://en.wikipedia.org/wiki/Heat_pipe
You can get commercial ones out of laptops or build your own:
http://www.fossilfreedom.com/manifolds.html
http://www.benchtest.com/heat_pipe1.html
or buy them.
D. This experiment is really interesting:
http://van.physics.illinois.edu/qa/listing.php?id=1630
E. Compare the insulating value of two sheets separated by 5 mm of air, vs the same boards separated by 2 cm or air.
2. Then there is the importance of temperature differentials, etc. A regular car radiator is a bit big, but you might be able to get a used car oil cooler – a much smaller radiator. With that you can run all sorts of experiments on transfer rate as a function of temperature difference, etc.
3. This site has a number of examples you can look at:
http://en.wikipedia.org/wiki/Heat_exchanger
4. For another theme, what is the best way to use solar power? Heating water? Solar thermal power generation?
http://en.wikipedia.org/wiki/Solar_thermal_energy