ef152-lec-6-1 - Module 6, Lecture 1 2nd Law of...

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EF 152 Spring, 2009 Lecture 6-1 1 Module 6, Lecture 1 2 nd Law of Thermodynamics NATURAL PROCESSES TEND TO MOVE TOWARDS A STATE OF GREATER DISORDER II EF 152 Spring, 2009 Lecture 6-1 2 Laws of Thermodynamics 1 st Law: Conservation of ________ 2 nd Law: Preferred __________ of a process Slide a book across a table, or drop a bowling ball onto the floor. Where does the lost mechanical energy go? Is it ever possible to reverse the process? A. Yes B. No Is it ever possible to convert heat back into mechanical energy? A. Yes B. No EF 152 Spring, 2009 Lecture 6-1 3 Heat Engines Direct mechanical energy _______ power _______ power Most energy comes from ______ Burning __________ __________ reactions Heat is useful for ________________ To operate a machine, we need ________________ Need to convert ______ to _________________ EF 152 Spring, 2009 Lecture 6-1 4 Heat Engine: Schematic Q W = 1 st Law Thermal Efficiency, η = η Combine equations h c h c Q Q Q Q = + = 1 1 c h Q Q Q + = Hot Thermal Reservoir, T h Cold Thermal Reservoir, T c Engine Q h Q c W
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This note was uploaded on 04/07/2009 for the course EF 152 taught by Professor Ab during the Spring '08 term at University of Tennessee.

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ef152-lec-6-1 - Module 6, Lecture 1 2nd Law of...

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