Chapter 2 - Chapter 2 Energy First Law and Cycles MAE 221...

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Chapter 2 Energy, First Law and Cycles MAE 221 Thermodynamics Notes
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14 Sep '08 MAE 221 Chapter 2 2 Notes which follow are largely based on: Fundamentals of Engineering Thermodynamics* , 6 th ed, M Moran & H Shapiro *Figure and section (§) numbers refer to text
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14 Sep '08 MAE 221 Chapter 2 3 Topics Energy Work Heat First Law Cycles
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14 Sep '08 MAE 221 Chapter 2 4 First Law of Thermodynamics For closed systems E = Q – W Change in Energy is balanced by addition of work & heat Energy E Can be stored in various forms (macro/microscopically) Can be transformed Can be transferred (by work or heat transfer) Total amount is always conserved
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14 Sep '08 MAE 221 Chapter 2 5 Units of Energy 1 Joule (J) = 1 N m = 1 kg·m 2 /s 2 1 Thermal calorie = 4.184 J 1 “diet” calorie = 1000 “thermal” calories 1 BTU = 1055.1 J 1 BTU = 778 ft·lbf
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