Conduction Convection amp Radiation

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=MzuzJQuy6gw

Bryan covers conduction, convection, and radiation. This short video is all about how heat is transferred and why heat transfer matters to an HVAC professional. • Conduction is heat transfer via direct contact with another solid surface; when contact exists between two surfaces, heat energy transfers from molecule to molecule. Something with a higher temperature has molecules that are bouncing around relatively quickly (on average) compared to the lower-temperature surface. We can prevent unwanted effects of conduction in the home through insulation. • Convection is heat transfer within a fluid (liquid or vapor), and the molecules are freer to move around. Molecules transfer their heat with them as they move through a fluid. A convective effect occurs when you open the fridge door, for example. • Radiation is heat transfer that occurs via electromagnetic radiant energy, especially sunlight. We know that the heat transfer from the sun is radiant because space is essentially a vacuum. However, the only electromagnetic energy we can see is visible light; there are plenty of radiation forms that we cannot see, including microwaves. Radiation heats surfaces, which is why you can block your face from a campfire and feel almost immediate relief from the heat. • Our bodies also radiate heat, and radiation is a significant point to consider when thinking about comfort. You can also feel cold despite a comfortable room temperature because your body might be radiating heat to a cooler wall or piece of furniture. • Read all the tech tips, take the quizzes, and find our handy calculators at https://www.hvacrschool.com/

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