EES 0837 Lecture Notes - Lecture 20: Hot Pot, Thermal Conductivity, Thermodynamics
3 Apr 2016
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Lecture - 20: heat engines, heat pumps, and refrigerators, getting something useful from heat, heat can be useful, normally heat is the end-product of the flow/transformation of energy. Remember examples from lecture #5 (coffee mug, automobile, bouncing. Heat regarded as waste: as useless end result ball: sometimes heat is what we want, though. Hot water, cooking, space heating: heat can also be coerced into performing useful (e. g. , mechanical) work. This is called a heat engine : heat engine concept, any time a temperature difference exists between two bodies, there is a potential, examples: for heat flow. Heat flows out of a hot pot of soup. Air over a hot car roof is lofted, gaining kinetic energy. That same air also gains gravitational potential energy. All of our wind is driven by temperature differences. We already know about radiative heat energy transfer.
