EESA01H3 Lecture Notes - Lecture 5: Solar Constant, Heat Flux, Global Warming
25 Oct 2013
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Assignments due 15 days after tutorial, due in dropboxes. The rate (amount per time) of energy (joules) received at a surface= power in j/s aka a watt (w) Energy we get is emitted at us as a wave, that wavelength is inversely proportional to the temp of the surface of what is emitting the radiation. Relates to how you feel, eg hot or cold. Power per surface area is an energy flux and is measured in w/m^2. If take watt, and see how much there is over a meter squared = energy flux: we talk about how much energy we get from sun in w/m^2. 5678 easy to remember, will be given: epsilon- a characteristic called emissivity, the efficiency at which a given surface can emit energy. 97% fuel efficient, 3% is lost: only thing that has an emissivity of 1. 0 is the sun, a black body emitter, emit at 100% efficiency, everything else has emissivity between 0 and 9. 999.
