General Effeciency - Chapter 10 Note | Lecture Note - Edubirdie

University:
York University
Course:
CHEM 1001 | Chemical Dynamics
Academic year:

2022
Views:

100

Pages:

1
Author:

Niklas

Chapter 10 02/02/2022 ⇒ ∆S = 0 for steps 3-D → C → A Efficiency = 1 - Tc/Th area under the curve is the work heat engines operate between 2 temperatures, Th and Tc work output per cycle = w = ∫PdV maximum efficiency = η = 1 - Tc/Th ΔE = CV(dT) (PV)^γ = constant, where γ = Cp/CV (~1.4 for air) How to make engines more efficient: "useful work" is non-PV work 1st law: ΔE = Q + W = Q + Wuseful - PΔV ΔH = ΔE + PΔV = Q + Wuseful - PΔV + PΔV ΔH = Q + Wuseful at constant T, (ΔH = Q) when useful work = 0, ΔS = Q/T ΔH = TΔS Wuseful = ΔG at constant pressure of temperature The most useful work we can extract from a system is ΔG. Carnot cycle is not useful work! ΔH - TΔS = ΔG ΔH ↓ ΔS ↑ ΔH ↑ ΔS ↓ ΔH ↑ ΔS ↑

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