CHE 3172 Chapter : Scan Doc0002
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2 t:j. u = 0: q = -nrt inc~) r, w = nrt inc~) r. Polytropic: for ideal gas undergoing adiabatic, reversible expansion/compression: Pvk = constant, k=cp/cv lj. u = 0 = wnet + qnet = wnet + qh - qc: wnet = qh - qc. Tc (ds) dt ds) dt ds) dt sys surr surr. = -~- + \. l, moutsout sys-\. l, minsin sys. 1st nd the same th and tc, : reversible heat engines have the highest efficiency using. : all reversible heat engines operating between the same. Th and tc must have the same efficiency, : for the same th, the engine that operates between reservoirs with the larger t:j. thas the higher efficiency. Isentropic the entropy of the system remains constant. Holds for a reversible, adiabatic process lj. suniv 2:: 0. < 0 for an impossible process process lj. suniv = lj. ssys + lj. ssutt. Ideal conditions: poutis = p out,real, sout,is = sin. Solve for real enthalpy: (assume adiabatic: hout = rjtchout,is.
