INSC 201 INSC 201
Virginia Commonwealth University
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This 1 page Class Notes was uploaded by Jane Notetaker on Wednesday September 21, 2016. The Class Notes belongs to INSC 201 at Virginia Commonwealth University taught by Arthur Reber in Spring 2016. Since its upload, it has received 4 views. For similar materials see Energy! in Interdisciplinary Sciences at Virginia Commonwealth University.
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Date Created: 09/21/16
Conduction: Vibrations of atoms/molecules transfer heat. Convection: Air molecules move from hotter to colder regions Radiation: Objects radiate infrared electromagnetic waves, where hotter objects radiate more energy. Heat Transfer and R-Values —The R-value of a material is calculated form how it transfers heat —R-values depend on the type and thickness of material. If the thickness doubles, then the R- value doubles. —To make a better insulated wall, you want to build it with a higher R-value Total R-value of a Wall —To ﬁnd the total R-value of a wall, add the R values of each material layer of the wall. —To ﬁnd the R-value of each layer, multiply its thickness (inches) by the R-value for 1” of material. Temperature Changes for Water —Speciﬁc heat measures how mcu heat energy is required to increase the temperature of 1kg of a substance by 1C —It takes 1kcal to heat 1 kg to liquid water by 1C It takes about 0.5 to heat 1kg of solid ice or gas vapor by 1C —Liquid has a hight heat capacity than gas vapor —If you add 10kcal of heat, liquid will have a smaller temperature increase. Phase Changes for Water ICE: Molecules vibrate in a crystal structure Liquid: Molecules move but are still attracted to each other Gas/Vapor: Molecules move fast and are far apart. Liquid is less dense than ice
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