CHEMICAL ENGINEERING
HEAT TRANSFER 135 The radius of the magnesia,r 3 D 75 CxD 0. 075 C 0. 001 xmwherexmm is the thickness of the magnesia. Hence ...
136 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS In calculatingNu,Pr,andRe, the thermal conductivity of the oil may be taken as 0.14 ...
HEAT TRANSFER 137 The mass flow,GD 0 .5 kg/s. ∴ hið 19. 0 ð 10 ^3 / 0. 14 87. 0 ð 10 ^3 / 154 ð 10 ^30.^14 D 2. 01 0. 5 ...
138 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Va l u e s o fTare now assumed and together with values ofhbfrom the given data subs ...
HEAT TRANSFER 139 PROBLEM 9.11 A condenser consists of 30 rows of parallel pipes of outer diameter 230 mm and thickness 1.3 mm w ...
140 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS and in equation 9.9: mD[89 372 T]/ln[89/ 372 T]D T 283 /ln[89/ 372 T] A ...
HEAT TRANSFER 141 Heat load QD 360 / 3600 ð 4. 18 Tw 280 D 0. 418 Tw 280 kW for water and: QD 75 / 1000 ð 1. 9 370 ...
142 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS 0.7 m long, per row. They are arranged in-line, with centre-to-centre spacing equal, ...
HEAT TRANSFER 143 or, substituting forTw: 2 D 480 Ta D 1 Thus in equation 9.9: mD 480 Ta Overall coefficient The solutio ...
144 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS With this value, the mean air and waste gas temperatures are 330 K and 440 K respec- ...
HEAT TRANSFER 145 Basing this value on the outside diameter of the pipe: hioD 97 ð 0. 038 / 0. 048 D 76 .8W/m^2 K Outside: Fro ...
146 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS In order to avoid severe scaling in such a case, the maximum allowable water temper- ...
HEAT TRANSFER 147 PROBLEM 9.16 A heat exchanger is to be mounted at the top of a fractionating column about 15 m high to condens ...
148 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS pressure drop, anddiD 19. 0 2 ð 1. 65 D 15 .7 mm or 0.0157 m. ∴ hiD 4280 0. 00 ...
HEAT TRANSFER 149 PROBLEM 9.17 An organic liquid is boiling at 340 K on the inside of a metal surface of thermal conduc- tivity ...
150 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS T 2 T 2 340 hb QT 1 Ts (K) (K) kW/m^2 K kW/m^2 (K) (K) 362.2 22.2 4.43 98.4 369. ...
HEAT TRANSFER 151 ∴ XD 325 300 / 372 300 D 0. 347 and: YD 372 361 / 325 300 D 0. 44 For one shell side pass, two tu ...
152 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Outside:hoD 0 .8kW/m^2 K and hence the clean overall coefficient is given by: 1 /UcD ...
HEAT TRANSFER 153 For a water outlet temperature ofTK and a mass flow ofGkg/s: 8. 25 nDGð 4. 18 T 290 kW or GD 1. 974 n/ T 2 ...
154 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS No. of tube passes Total tubes Outlet water temperature Tube length Nn T(K) (m) 19.4 ...
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