Thermodynamics Notes Ch 2

Thermodynamics Notes Ch 2 - Thermodynamics Notes Ch 2: 2-1...

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Thermodynamics Notes Ch 2: 2-1 Intorduction: - energy cannot be created or destroyed by a process, it can only be converted from one form to another - electricity is high quality energy and heat is low quality energy 2-2 Forms of energy - the sum of all energies in a system is the total energy of that system Total energy in a system on a unit mass basis: m E e = e = total energy on a unit mass basis E = total energy M = mass 2 Groups of energy: 1. Macroscopic – those forms a system posses with respect to some outside source – energy that is obvious or that you can see/sense easily 2. Microscopic – forms of energy that are related ot the molecular structure of a system Internal energy – U – the sum of all the microscopic energies Types of energy: Kinetic energy – The energy of motion - 2 5 . mV KE = - for unit mass, you always divide by the mass given Potential Energy – The energy of position – PE=mgz Stationary systems – volicity and elevations of the center of gravity remain constant Mass flow rate – the amount of mass flowing through a cross section per unit time Note: a dot above something indicates the time rate for that variable Mass flow rate: avg c V A V m ρ = = Energy flow rate: e m E = Sensibel energy – the internal energy associated with the kinetic energies of the molecules Latent Energy – the internal energy associated with the phase of somethings Chemical energy – the internal energy associate with the chemical bonds
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Nuclear energy – the internal energy associate with the strong bonds of the nucleus - atoms may also posess electric or magnetic dipole energies
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Thermodynamics Notes Ch 2 - Thermodynamics Notes Ch 2: 2-1...

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