CHEMICAL ENGINEERING
HEAT TRANSFER 175 and hence the heat loadD 30 ð 4. 18 300 290 D1254 kW At atmospheric pressure, benzene condenses at 353 K an ...
176 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS and for a mean specific heat of 1.0 kJ/kg K, the heat load isQD 2. 455 ð 1. 0 665 ...
HEAT TRANSFER 177 Thus, assuming one shell pass, two tube-side passes, from Figure 9.71:FD 0 .82 and mFD 0. 82 ð 180 D 147 .6 ...
178 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS 0 330 Mean heat transfer coefficient ( h W/m 2 K) 250 200 150 1 Pipe length (l m) 23 ...
HEAT TRANSFER 179 When the scale has formed, the total resistance is: 0. 0003 C 1 /[2. 236 ð 10 ^6 L Ts 3602.^5 ]D 0. 0003 C ...
180 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Solution Use is made of equation 9.209: ln[ TsT 1 ]/ TsT 2 DUAt/GCp ∴ ln[ 390 ...
HEAT TRANSFER 181 Solution The terms “black body” and “grey body” are discussed in Sections 9.5.2 and 9.5.3. For two large paral ...
182 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Solution For conduction through the lagging: QD 4 $k T 1 T 2 / 1 /r 1 1 /r 2 ( ...
HEAT TRANSFER 183 Solution Preliminary calculation At 101.3kN/m^2 , benzene condenses at 353 K at which the latent heatD394 kJ/k ...
184 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Outside: For condensation on vertical tubes: ho ^2 /k^3 ^2 g^0.^33 D 1. 47 4M/ ...
HEAT TRANSFER 185 D √ 0. 0328 80 tanh 1. 3011 D 14. 49 e^1.^301 e^1.^301 / e^1.^301 Ce^1.^301 D 14. 49 3. 673 0. 272 ...
186 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS With scale hiD 5. 265 u^0.^8 kW/m^2 K, scale resistanceD 0 .20 m^2 K/kW and: 1 /UD 1 ...
HEAT TRANSFER 187 PROBLEM 9.55 Derive an expression for the radiant heat transfer rate per unit area between two large parallel ...
188 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Solution The cross-sectional area of 0.025 m tubingD $/ 40. 0252 D 0 .000491 m^2. V ...
HEAT TRANSFER 189 PROBLEM 9.57 A liquid hydrocarbon is fed at 295 K to a heat exchanger consisting of a 25 mm diameter tube heat ...
190 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS The heat flux is: 511 ð 78 D 117 .9kW/m^2. For a small length of tube, say 0.001 ...
HEAT TRANSFER 191 The outlet temperatureT^0 is then given by: ∫T 0 290 dT 320 T D 0. 0000319 h ∫ 5 0 dL or: ln 320 T^0 Dln ...
192 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS PROBLEM 9.61 A jacketed reaction vessel containing 0.25 m^3 of liquid of density 900 ...
HEAT TRANSFER 193 Solution If the heat transfer coefficienthcan be expressed as a product of powers of the variables, then: hDk^ ...
194 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Assume that the film heat transfer coefficient for the liquid in the tubes is propor ...
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