CHEMICAL ENGINEERING
HEAT TRANSFER 195 ∴ U 1 D 3. 4 k^0 ð 1750.^8 / 3. 4 Ck^0 ð 1750.^8 D 211. 8 k^0 / 3. 4 C 62. 3 k^0 and:U 2 D 3. 4 k^0 ð 325 ...
196 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS The change in temperature is then given by: ∫T 368 dT/ 293 TD 1 / 1425 ∫ 1800 0 ...
HEAT TRANSFER 197 If the thickness of the lagging is doubled to 0.100 m, then: 0. 05 ð 8 / 0. 100 TT 1 D 10 ð 8 T 1 29 ...
198 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Mass flow of waterD 1000 ð 0. 00112 D 1 .12 kg/s Heat removed by waterD 1. 12 ð 4. ...
HEAT TRANSFER 199 The heat flow to the surroundings is:QDhoAo T 2 To ∴ 3500 Dho $ð 2. 0 ð 5. 0 301 293 andhoD 14 .05 W/m^2 ...
200 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Mass of liquid:mD 0. 147 ð 980 D 144 .3kg and: mCpD 144. 3 ð 3000 D 432 ,957 J/K ...
HEAT TRANSFER 201 In this case the outside temperature of the lagging will be 288 19. 8 D 268 .2Kand the temperature drop th ...
202 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Taking the density as 1000 kg/m^3 , Mass flow of waterD 1000 ð 0. 00049 D 0 .491 k ...
HEAT TRANSFER 203 PROBLEM 9.71 Liquid is heated in a vessel by means of steam which is supplied to an internal coil in the vesse ...
204 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Solution The conduction through the firebrick is given by: QD 400 D 1. 5 ð 1. 0 / 0 ...
HEAT TRANSFER 205 From equation 9.1: 350DUAð 30. 83 and: UAD 11 .35 kW/K. ii)Co-current flow Heat load,QD 2. 8 ð 2. 5 363 TD ...
206 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS What is the coefficient for the water when the exchanger is operating with cocurrent ...
HEAT TRANSFER 207 temperature is 293 K. When the outside and initial temperatures are only 278 K, it takes 2700 s to heat the co ...
208 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS The pipe is then lagged with a 50 mm thickness of lagging of thermal conductivity 0. ...
HEAT TRANSFER 209 surroundings at 293 K from the outside of the vessel. How long does it take to heat the liquid from 293 to 353 ...
210 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS to the 0.8 power of the gas velocity and the heat transfer by radiation from the wal ...
HEAT TRANSFER 211 This result agrees fairly well and a mean value ofTwD545 Kis indicated. In equation (iv): k^0 /kD 3. 624 323 ...
212 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS andinequation9.9:TmD 70 1. 60 ToC 510. 3 /ln[70/ 1. 60 To 510. 3 ] D 580. 3 ...
HEAT TRANSFER 213 The maximum temperature which can be attained is obtained by putting dT/dtD0in(i) which gives: TmaxD 385 .5K. ...
214 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS Substituting forT 2 from (i): 104 D[413 49. 14 C 1. 809 x/ 0. 157 C 0. 00628 x] ...
«
6
7
8
9
10
11
12
13
14
15
»
Free download pdf