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Thermodynamics: An Engineering Approach Seventh Edition in SI Units Yunus A. Cengel, Michael A. Boles McGraw-Hill, 2011 Chapter 2 ENERGY, ENERGY TRANSFER, AND GENERAL ENERGY ANALYSIS Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Objectives • Introduce the concept of energy and define its various forms. • Discuss the nature of internal energy. • Define the concept of heat and the terminology associated with energy transfer by heat. • Discuss the three mechanisms of heat transfer: conduction, convection, and radiation. • Define the concept of work, including electrical work and several forms of mechanical work. • Introduce the first law of thermodynamics, energy balances, and mechanisms of energy transfer to or from a system. • Determine that a fluid flowing across a control surface of a control volume carries energy across the control surface in addition to any energy transfer across the control surface that may be in the form of heat and/or work. • Define energy conversion efficiencies. • Discuss the implications of energy conversion on the environment. 2 INTRODUCTION • • If we take the entire room—including the air and the refrigerator (or fan)—as the system, which is an adiabatic closed system since the room is well-sealed and well-insulated, the only energy interaction involved is the electrical energy crossing the system boundary and entering the room. As a result of the co ...
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