CHEMICAL ENGINEERING
HEAT TRANSFER 155 Case (b) Again,mD 37 .4 K. In equation 9.212: XD 2 1 / T 1 1 D 320 300 / 360 300 D 0. 33 YD ...
156 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS The thermal resistances of each material, (x/kA), are: firebrickD 1 / 6. 22 D 0 .1 ...
HEAT TRANSFER 157 PROBLEM 9.25 Toluene is continuously nitrated to mononitrotoluene in a cast-iron vessel 1 m in diameter fitted ...
158 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Overall TakingkwD 15 .9W/mKandRoandRias 0.0004 and 0.0002 m^2 K/W respectively, then ...
HEAT TRANSFER 159 The tube i.d.D 19. 0 2 ð 1. 67 D 15 .7mm the cross-sectional area for flowD $/ 4 0. 01572 D 0 .000194 m^ ...
160 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS be cooled from 420 to 380 K. There is available a tubular exchanger with an inside s ...
HEAT TRANSFER 161 and cross-sectional area for flowD $/ 4 0. 01482 D 0 .000172 m^2 per tube or: 0. 000172 ð 162 D 0 .0279 m^ ...
162 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS The coefficient for condensing steam including any scale will be taken as 8500 W/m^2 ...
HEAT TRANSFER 163 The radiating source is the furnace walls atT 1 D1500 K and for a black surface, e 1 D 1 .0. The heat sink is ...
164 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS The following data are obtained by substituting values forT 1 in equations (i) and ( ...
HEAT TRANSFER 165 Equating (i) and (ii): 1. 94 ð 10 ^6 T^4 5. 10 ð 10 ^4 T^3 C 1. 20 ð 105 T^0.^5 D 3. 42 ð 104 or: 5. 67 ð ...
166 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS ∴ tD ( 48. 6 ð 0. 50 ð 103 0. 78 ð 0. 225 ð 5. 67 ð 10 ^8 )( 1 4 ð 14003 ) ð ( ...
HEAT TRANSFER 167 For theinner lagging:r 2 D 0. 028 C 0. 025 D 0 .053 m r 1 D 0 .028 m and: rmD 0. 053 0. 028 / ln 0. 053 ...
168 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS whereTis the water outlet temperature. Thus: T 285 D GoCp/GwCp 420 350 D 0. ...
HEAT TRANSFER 169 Outside:hoD 1 .70 kW/m^2 K. Wall: TakingksteelD45 W/m K,x/kD 0. 003 / 45 D 0 .00007 m^2 K/W or 0 .07 m^2 K/k ...
170 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Forconvectionfrom the pipe, the heat loss: qcDhcA TsT D 1. 65 443 2900.^25 ð 1. ...
HEAT TRANSFER 171 PROBLEM 9.39 A stirred reactor contains a batch of 700 kg reactants of specific heat 3.8 kJ/kg K initially at ...
172 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS or: 0. 00125 t^2 1. 05 t 70 D0andtD902 s Therefore in (i): TD 290 C 0. 083 ð 90 ...
HEAT TRANSFER 173 T 1 D 388 377 D11 deg K,T 2 D 333 293 D40 deg K and from equation 9.9: TmD 40 11 /ln 40 / 11 ...
174 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Solution IfTandT^0 are the liquid and thermometer temperatures respectively after ti ...
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