where mm is the colun1n’s mass, Aha“, is its elevation change,
A, is its cross-section area, and g is the acceleration of free fall.
The sum of the energy changes of a stationary system and a
column of the atmosphere resting on it equals the system’s
enthalpy change:3
Ms + ABM-ti = Mia + fhmAV$r§ = Mia (10)
By the same reasoning, the sum of the energy changes of a
thermal reservoir (res) open to the atmosphere and the column of the atmosphere resting on it equals the enthalpy change of the reservoir: .
AEres + AEatrn(r-es} = Atlas + l%tmAl/ies = AHres (ll)
This enthalpy change can be evaluated from
AI-Ires = cp.resAIl'es (12)
where C, is the reservoir’s heat capacity at constant pressure. Under favorable conditions, the global formulation allows the system’s entropy change AS“, to be evaluated from measurements in its mroundings. The entropy change of a thermal reservoir is given by AS”, = AH,g.fT,E,. Any part of the supersystem whose energy change is purely mechanical has constant enthalpy and entropy. Thus, the entropy change of a supersystem with thermal energy changes in only the system and a thermal reservoir is given by
Asss : Assys + AHrEs;Tms (13)
where mm is the colun1n’s mass, Aha“, is its elevation change,
A, is its cross-section area, and g is the acceleration of free fall.
The sum of the energy changes of a stationary system and a
column of the atmosphere resting on it equals the system’s
enthalpy change:3
Ms + ABM-ti = Mia + fhmAV$r§ = Mia (10)
By the same reasoning, the sum of the energy changes of a
thermal reservoir (res) open to the atmosphere and the column of the atmosphere resting on it equals the enthalpy change of the reservoir: .
AEres + AEatrn(r-es} = Atlas + l%tmAl/ies = AHres (ll)
This enthalpy change can be evaluated from
AI-Ires = cp.resAIl'es (12)
where C, is the reservoir’s heat capacity at constant pressure. Under favorable conditions, the global formulation allows the system’s entropy change AS“, to be evaluated from measurements in its mroundings. The entropy change of a thermal reservoir is given by AS”, = AH,g.fT,E,. Any part of the supersystem whose energy change is purely mechanical has constant enthalpy and entropy. Thus, the entropy change of a supersystem with thermal energy changes in only the system and a thermal reservoir is given by
Asss : Assys + AHrEs;Tms (13)
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