Energy_Balances

Energy_Balances - Energy Balances Only differences in...

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Energy Balances Only differences in energy can be measured Energy is transferred in two forms: Work: Force*Displacement Done by system: positive Heat: Energy transfer due to temperature difference Transferred from system: negative Total energy of a system has three components: Kinetic Energy: E k =½mv2 Potential Energy: E p =mgz Internal Energy: U=U(T, P, Composition) Energy Balances simply equate energy transferred to total energy change!
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Energy Balances on Closed Systems Closed: No transfer of mass across system boundaries W Q E E U p k - = + + ΔU=0 if T and phase are constant, no reactions occur and ΔP is small ΔEk=0 if system is not accelerating ΔEp=0 if height remains constant Q=0 (adiabatic) if T is constant or system is well insulated W=0 if no moving parts, electrical currents, or radiation
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Energy Balances on Open Systems Open: Mass crosses boundaries Where Same as closed system, except…
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This note was uploaded on 11/12/2009 for the course CHEM 2190 at Cornell.

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Energy_Balances - Energy Balances Only differences in...

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