Thermodynamics HW Solutions 299

Thermodynamics HW Solutions 299 -...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 4 Transient Heat Conduction 4-21 "!PROBLEM 4-21" "GIVEN" E_dot=1000 "[W]" L=0.005 "[m]" A=0.03 "[m^2]" T_infinity=22 "[C]" T_i=T_infinity h=12 "[W/m^2-C], parameter to be varied" f_heat=0.85 T_f=140 "[C], parameter to be varied" "PROPERTIES" rho=2770 "[kg/m^3]" C_p=875 "[J/kg-C]" alpha=7.3E-5 "[m^2/s]" "ANALYSIS" V=L*A m=rho*V Q_dot_in=f_heat*E_dot Q_dot_out=h*A*(T_ave-T_infinity) T_ave=1/2*(T_i+T_f)
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: (Q_dot_in-Q_dot_out)*time=m*C_p*(T_f-T_i) "energy balance on the plate" h [W/m 2 .C] time [s] 5 51 7 51.22 9 51.43 11 51.65 13 51.88 15 52.1 17 52.32 19 52.55 21 52.78 23 53.01 25 53.24 T f [C] time [s] 30 3.428 40 7.728 50 12.05 60 16.39 70 20.74 80 25.12 90 29.51 100 33.92 110 38.35 120 42.8 130 47.28 140 51.76 150 56.27 160 60.8 170 65.35 180 69.92 190 74.51 4-10...
View Full Document

Ask a homework question - tutors are online