INSC 201 Lecture Notes - Lecture 4: Phase Transition, Mecha, Spontaneous Process
1 Feb 2017
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Document Summary
Temperature: measures the thermal energy of an object. Heat: flow of thermal energy between objects with different temperatures. Types of heat transfer: conduction, convection radiation, r-values for home insulation. Temperature and phase changes: heating water and hurricanes. Thermal efficiency of heat engine: the(cid:396)(cid:373)al e(cid:374)e(cid:396)gy is (cid:862)low-(cid:395)uality(cid:863)e(cid:374)e(cid:396)gy. Coal (chem energy) undergoes combustion to produce heat (therm energy: this heat then porduces steam that roatates turbines (mech energy) to produce electricity (electrical energy) Approximately 60% of the original energy is lost to heat i(cid:374) this (cid:862)heat e(cid:374)gi(cid:374)e(cid:863) Conduction: vibrations of atoms/molecules transfer heat: atoms/molecules do not move from one region to another. Convection: air molecules move from hotter to colder regions. Radiation: objects radiate infrared electromagnetic waves, where hotter objects radiate more energy. The r-value of a material is calculated from how it transfers heat. R-values depend on the type and thickness of material. If the thickness doubles, the the r-value doubles.
