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PS10 Solutions

# PS10 Solutions - l MlOSA Introduction to Engineering...

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Unformatted text preview: l. MlOSA Introduction to Engineering Thermodynamics Winter 2008 Problem Set 10 [Modiﬁed Version of Problem 7.11 in Moran and Shapiro, 4th Edition]. A system consists of 5 kg of water at 10°C and 1 bar. Determine the exergy, in k], if the system is at rest and zero elevation reiative to an exergy reference environment for which To : 20°C, p0 m 1 bar. Assume that the water is incompressible. One kilogram of air initially at 1 bar and 25°C is heated at constant pressure with no internal irreversibilities to a ﬁnal temperature of 177°C. Employing the ideal gas model, determine the work, the heat transfer, and the amounts of exergy transfer accompanying work and heat transfer, each in kJ. Let To = 298 K, p0 m 1 bar. . Determine the speciﬁc exergy and the speciﬁc ﬂow exergy, each in Btu/lbm, for steam at 1000 lbf/inz, 800°F, with V= 80 ft/s and z 3 100 ft. The velocity and elevation are relative to an exergy reference environment for which T0 = 60°F, p0 = 1 atm, and g = 32.2 ft/sz. Neglect the compressibility of water at the reference state. Due Thursday, March 13, 2008 ( Froblam KHI) is 21+ rcsf and 25m ttevaﬁ‘on relaf—i‘xe +0 11% gmpaj VC{_W{HC£ {Cruz/{Van men}: mi 2.0%) 1 bar, 5c?— maﬁa ‘tén‘v'é’n D’c'ijla ‘2 WORY‘ ”.1: :20 "c: Pa 3‘ ibar Frlhd.‘ '73- [00°C M???) f (45.3) F: 15‘3" Assamégﬁ'ans [g h ézllmrl‘ﬂg M vial -. I. Sgskm is af resf- And; E0“? {Lwa‘an git/(15V: "110 Mg entry? yakrence, 2, 771.2, emf???» rekrmce. ('3: Ta :- .263"? N 1% = 1. bar 3, [ﬁg-M, ﬂu ﬁgs-fem (it???) .1193?) W m axe my? rekn’nence, enVlfPanmmi' (212%J ibar) arr: :sh'gvh'f'ly, GGM’DMSSKO' as Show’n in W ‘7LV' di’ﬂgram; hejlecf ﬂampfessfblg 51%ng and eualqav‘e ‘ _ Fm Tabla H—Z.‘ propamlw‘es M‘ W saw/“aka! 157%“! ' —P'r—j,-_——m~—~; 5431‘“: 3‘1" 26%?) [0’6 resPec:,-F1’va 9, mm" “3M3 "a! 5:5: 30;: 72;? 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