fundamentals of heat and mass transfer solutions manual phần 6 docx

... 466 0s 1.29h 7500W π ××− =×== < Continued PROBLEM 8.28 KNOWN: Inlet temperature, flow rate and properties of hot fluid. Initial temperature, volume and properties of pharmaceutical. Heat transfer ... 8.34 KNOWN: Flow rate and inlet temperature of water passing through a tube of prescribed length, diameter and surface temperature. FIND: (a) Outlet water temperature...

Ngày tải lên: 08/08/2014, 17:20

... value of the heat rate. PROBLEM 1.39 KNOWN: Power consumption, diameter, and inlet and discharge temperatures of a hair dryer. FIND: (a) Volumetric flow rate and discharge velocity of heated ... consumption of 11 E E/ 6. 45 10 J, ff η ==× the annual cost of the loss is 5 C C E 0.01 $/MJ 6. 45 10 MJ $64 50 gf == ×× = < COMMENTS: The heat loss a...

Ngày tải lên: 08/08/2014, 17:20

... thickness and thermal conductivity of steel tubes. Temperature of steam flowing through the tubes. Thermal conductivity of insulation and emissivity of aluminum sheath. Temperature of ambient air and ... T(0). PROBLEM 3. 36 KNOWN: Temperature and volume of hot water heater. Nature of heater insulating material. Ambient air temperature and convection coefficient. Unit...

Ngày tải lên: 08/08/2014, 17:20

... 85 85 68 .8 52.5 20 3 85 76. 9 68 .8 44.4 20 4 20 76. 9 76. 9 60 .7 44.4 20 5 76. 9 68 .8 60 .7 40.4 20 6 30 68 .8 68 .8 54 .6 40.4 20 7 68 .8 61 .7 54 .6 37.3 20 8 40 61 .7 61 .7 49.5 37.3 20 9 45 61 .7 55 .6 49.5 ... 287 .6 305.8 315.2 321.5 323.5 324.5 325 325 6 108 285 .6 301 .6 313.5 319.3 322.7 324.0 324.5 325 7 1 26 281.8 299.5 310.5 317.9 321.4 323.3 324.2 8...

Ngày tải lên: 08/08/2014, 17:20

... 100 100 - 50 86. 0 105 .6 119 131.7 151 .6 200 50 88.2 117.4 138.7 1 56. 1 174 .6 200 50 99 .6 137.1 162 .5 179.2 190.8 200 50 123.0 168 .9 194.9 207 .6 209.4 200 50 173.4 220.7 240 .6 2 46. 8 239.0 200 - ... the nodal temperatures ( ° C). Mesh T o T 1 T 2 T 3 T 4 Coarse 162 .5 118. 76 1 56. 25 168 . 76 2 06. 25 Fine 162 .5 117.4 1 56. 1 168 .9 207 .6 The maximum difference for the i...

Ngày tải lên: 08/08/2014, 17:20

... R''tc 0. 96 0.0 06 0. 066 0.0001375 6. 24 1.44 0.978 0.9814 9.471 1 .64 8E4 0 */ /* Correlation results and air thermophysical properties at Tf NuLbarPr ReL Tf hLbar k nu uinf 2294 0.7035 1 .63 E6 325 53.82 ... Diameter and length of a copper rod, with fixed end temperatures, inserted in an airstream of prescribed velocity and temperature. FIND: (a) Midplane temperature...

Ngày tải lên: 08/08/2014, 17:20

... % # % 32 3 3 62 62 5 9 8 0 0033 273 015 1589 10 22 5 10 308 10 and from Eq. 9.34, () () () 2 2 1 /6 5 1 /6 s,i D,i o 8/27 8/27 9/ 16 9/ 16 i 0.387 3.08 10 T T 0.387Ra k 0.0 263 h 0 .60 0 .60 D0.15 1 0.559 ... (a) Heat transfer rate by free convection to the room, per unit length of the tube; effect on quality, x, at outlet of 30 m length of tube; (b) Effect of radiati...

Ngày tải lên: 08/08/2014, 17:20

... (kg/s) 60 62 64 66 68 70 Exchanger length, L (m) PROBLEM 11.20 KNOWN: Counterflow concentric tube heat exchanger. FIND: (a) Total heat transfer rate and outlet temperature of the water and (b) ... is ( ) 66 hfg qmh1.5kg/s2.30410J/kg3. 461 0W ==×=× & and the corresponding heat capacity rate for the water is ( ) 6 cminc,oc,i CCq/TT3. 461 0W/40K 86, 400W/K.==−=×= He...

Ngày tải lên: 08/08/2014, 17:20

... ch =+=+− ερε ε 16 161 61 6 1 (4) and G w is equal to the blackbody emissive power at T ch . Using Eqs. (3) and (4) and substituting numerical values, find σεσ εσ TT T bp 4 ww 4 w ch 4 =+− 1 16 800 07 ... 0 .68 0 µ − →= . Hence, ε = 0.3 × 0 .68 + 0.8(1 − 0 .68 ) = 0. 460 . For the maximum allowable value of T s = 1800 K, it follows that 84 84 84 o 0.391 5 .67 10 (2400) 0.8...

Ngày tải lên: 08/08/2014, 17:20

... of heat transfer to tube without ash deposit, (b) Rate of heat transfer with an ash deposit of diameter D d = 0. 06 m, (c) Effect of deposit diameter and convection coefficient on heat rate and contributions ... Do(m) 0 50 100 150 200 Heat rates (W/m) Radiation heat rate (W/m) Convection heat rate (W/m) Total heat rate (W/m) PROBLEM 13.107 KNOWN: Thickness an...

Ngày tải lên: 08/08/2014, 17:20