4 Energy and Heat Transfer

4 Energy and Heat Transfer - Energy and Heat Transfer...

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Unformatted text preview: Energy and Heat Transfer GEOG345 Sep 12 2006 Textbook: chapter 2 (1 st half) Energy energy energs (Greek): at work energy is the ability or capacity to do work on some form of matter various forms exist mechanical energy position and movement of objects radiant energy it can change from one form to another total amount of energy in a closed system remains constant law of conservation of energy first law or thermodynamics Mechanical energy gravitational potential energy (PE) PE=mgh m: mass of the object g: acceleration of gravity h: height above ground kinetic energy (KE) KE=mv 2 m: mass of the object v: velocity SI unit of energy: Joule (J) 1 J=1 Nm=1 kgm 2 /s 2 Temperature, internal energy and heat air (atoms and) molecules have kinetic energy due to their motion temperature is a measure of the average kinetic energy internal energy is the total energy (potential and kinetic) stored by the molecules heat is energy in the process of being transferred due to temperature difference (or temperature gradient ) Fig. 2-1, p. 29 Temperature and density Temperature scales absolute zero: no thermal motion Kelvin scale (K) starts at the absolute zero Celsius scale (C) same units as the Kelvin scale 0C: freezing temperature of pure water 100C: boiling temperature of water at sea level Fahrenheit scale (F) freezing temperature of pure water: 32F boiling temperature of water at sea level: 212F Temperature conversions K= C + 273.15 C = 5/9 (F-32) F = 9/5 (C+32) K = 5/9 (F-32) + 273.15 Fig. 2-2, p. 30Fig....
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This note was uploaded on 04/10/2008 for the course GEOG 345 taught by Professor Csiszar during the Fall '06 term at Maryland.

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4 Energy and Heat Transfer - Energy and Heat Transfer...

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