ch02 - Chapter 2: Energy and the 1st Law of Thermodynamics...

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Chapter 2: Energy and the 1 st Law of Thermodynamics The Study of Energy in Closed Systems
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Energy: The Property • Common Units – J(N·m) or kJ –f t · lb f –B tu ) ( 2 1 2 1 2 2 V V m KE = ) ( 1 2 z z g m PE = • Kinetic Energy • Potential Energy
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Energy Changes • Total Energy: An extensive property of a system – Kinetic Energy (Mechanical) – Potential Energy (Mechanical) – Internal Energy: U or u • Represents all other forms of energy • Includes all microscopic forms of energy EK E P E U ∆= + +
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•W o r k – W > 0 : Work done by the system – W < 0 : Work done on the system – Time rate of work is Power: • Heat Transfer – Q > 0 : Heat transfer into the system – Q < 0 : Heat transfer out of the system – Rate of heat transfer: Energy Transfers W Q
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Work dV p V V 2 1 Work is process (path) dependent, and is NOT a property of the system • Expansion/Compression Work (Moving Boundary Work) • Elongation of a solid bar • Stretching of a Liquid Film • Rotating Shaft
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ch02 - Chapter 2: Energy and the 1st Law of Thermodynamics...

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