# Prob7_36soln - ‘ 1900°R is removed from an oven and...

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Unformatted text preview: ‘ 1900°R is removed from an oven and quenched by, p the metal is cm = 0.1 Btu/lb - °R. Heat transfer from the System boundary 7.36 As shown in Fig. P736, a 0.8-lb metal bar initially at immersing it in a closed tank containing 20 lb of water ini.‘ tially at 530°R. Each substance can be modeled as incom. pressible. An appropriate constant specific heat for the water is cw = 1.0 Btu/lb - °R, and an appropriate value for tank contents can be neglected. Determine the exergy . . _ o i '3 destruction, in Btu. Let To — 77 .F' Metal bar: Tmi = 1900°R Twi = 530°R cm = 0.1 Btu/lb- °R cw = 1.0 Btu/lb- °R : mm = 0.8 lb mw = 201b Exam! Aesl-me-ﬁon (or “3rrevers;l>ll§+\1) \5 Too; €ﬂ%?Y cadets-Hon . rCJ/wm e‘ amws [Mega 7' crosstvxs +0— Sbsﬁa‘Ssam=§/X{:7/i;1'%a:e+6 So 6: [Sm+SWEL’I/SM%SV:§& O, : mm (AL ’A!)M +Mw(ﬂz.'/‘)v\)w : / +33 bubs’mmoe calejerwJevr ‘\ meta/l lS ‘mwwxevesséla it ”‘50s; d 4%: j; AT n u wail—Cr is mumpms‘silbie lxquizl )0 A _ C/Q/YtTZ 0‘: MM C1M zen; +mewX/n1‘: «abul'T lswrlcmvm.i 2— IY" kW Final TL by “W17 «the «Ctvslr Law : Ubalmz~ UM“ =/®/f W/O mm(u.;u)M +Mw(uZ My: i ﬁr"émCamFressIElc"subs‘lwnoe ‘- u :5); AT m?” (0L7, "4%) = Cm (T ’Tv Kaunsi'm'i' (“z ’ “1)“, ~Cw (T Tw) 5ce «amelea ‘5 (P278 +96?) —~> T= 555° 2 ma 3-: 00354] Elm/K = 4M an 3o Exex’gy Deshuclim TDG’ ...
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