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me2322_lecture04

# me2322_lecture04 - ME 2322 Engineering Thermodynamics...

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ME 2322 Engineering Thermodynamics I Lecture 04, 01/22/08 Prof. Zhaoming He

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Chapter 2: Energy, Energy Transfer, and General Energy Analysis • Introduce the concept of energy and define its various forms. • Define the concept of heat and the terminology associated with energy transfer by heat. • Define the concept of work, including electrical work and several forms of mechanical work.
The First Law of Thermodynamics Conservation of Energy • Insulated room with a refrigerator • What happens to the room temperature?

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Forms of Energy Total energy E or energy per unit mass e=E/m Energy is relative to a reference, no absolute value of the total energy Two groups of energy: macroscopic and microscopic forms – Macroscopic forms : overall energy relevant to outside reference frame • Related to motion and external effects such as gravity, et al. • Kinetic Energy (KE) – Translation: mV 2 /2 or KE per unit mass ke= V 2 /2 – Rotation: ke=I ω 2 /2 • Potential Energy (PE) =mgz or PE per unit mass pe=gz – Microscopic forms : energy irrelevant to outside reference frame, Energy forms are related to molecular structure and activities. • Internal energy U: molecular structure and activity Total E=microscopic + macroscopic =U+KE+PE=U+mV 2 /2+mgz E per unit mass: e=u+V 2 /2+gz, u=U/m – Stationary closed system : no ke and pe change, so Δ E= Δ U
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me2322_lecture04 - ME 2322 Engineering Thermodynamics...

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