fundamentals of heat and mass transfer solutions manual phần 7 pot

... per unit length of the tube; effect onquality, x, at outlet of 30 m length of tube; (b) Effect of radiation on heat transfer and quality of outletflow; (c) Effect of emissivity and insulation ... PROBLEM 9 .78 (Cont.)(b,c) Summary of the calculations above and for water and ethylene glycol:Fluid RaD()2DhW/mK⋅ q(W)Air 6 .75 0 × 104 10.6 1.55 <Water 7. 273 × 10 7 1299 1 87 <Ethylene ... 0033 273 0151589 10 22 5 10308 10 and from Eq. 9.34,()()()221/651/6s,iD,io8/ 27 8/ 27 9/16 9/16i0.3 87 3.08 10 T T0.387Rak 0.0263h 0.60 0.60D0.151 0.559 Pr 1 0.559 0 .70 7∞×−=+...

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fundamentals of heat and mass transfer solutions manual phần 2 docx

... Temperature and volume of hot water heater. Nature of heater insulating material. Ambientair temperature and convection coefficient. Unit cost of electric power.FIND: Heater dimensions and insulation ... radius.PROBLEM 3.43KNOWN: Diameter of electrical wire. Thickness and thermal conductivity of rubberized sheath.Contact resistance between sheath and wire. Convection coefficient and ambient air temperature.Maximum ... m⋅K/W at r3 = 0. 075 m.The heat loss may be reduced by almost 91% from a value of approximately 1830 W/m at r3 = r2= 0.0 375 m (no insulation) to 172 W/m at r3 = 0.0 575 m and by only an additional...

fundamentals of heat and mass transfer solutions manual phần 3 pdf

... 198.2 193.3 186 .7 178 .3 168.4 1 57. 4 145.6 133.4 121.050 228.9 228.3 226.2 222.6 2 17. 2 209 .7 200.1 188.4 175 .4 161.6 1 47. 5 75 255.0 254.4 252.4 248 .7 243.1 235.0 223.9 209.8 194.1 177 .8100 282.4 ... below, where x and y are in mm and the temperatures are in °C.y\x 0 25 50 75 100 125 150 175 200 225 250 275 3000 180 .7 180.2 178 .4 175 .4 171 .1 165.3 158.1 149.6 140.1 129.9 119.4 108 .7 98.025 ... To and T∞, the relative amounts of heat transfer to the air and heat sinkare determined by the values of h and t,cR.′′PROBLEM 4.54 (Cont.)The heat rate by convection between the bar and...

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fundamentals of heat and mass transfer solutions manual phần 4 docx

... 68.8 52.5 203 85 76 .9 68.8 44.4 204 20 76 .9 76 .9 60 .7 44.4 205 76 .9 68.8 60 .7 40.4 206 30 68.8 68.8 54.6 40.4 20 7 68.8 61 .7 54.6 37. 3 208 40 61 .7 61 .7 49.5 37. 3 209 45 61 .7 55.6 49.5 34.8 ... 294 .7 313 .7 320.3 324.5 325 325 325 325 4 72 293.0 3 07. 8 318.9 322.5 324.5 325 325 325 5 90 2 87. 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 ... form of the FDEs for theinterior nodes. Use space and time increments of 37. 5 mm and 1.2 s, respectively, for a 17- nodenetwork. For the surface node 00, use the FDE derived in Section 2 of the...

fundamentals of heat and mass transfer solutions manual phần 5 ppsx

... plate and ()()()4/51/34/5 1/3 5LLNu 0.037Re 871 Pr 0.0 37 9 .78 10 871 0 .70 1263=−=×− =2Lk 0.028W m Kh Nu 1263 29.7W m KL 1.2m⋅== = ⋅The heat rate is()( )22q 29 .7 W ... emissivity of Nichrome wire. Electricalcurrent. Temperature of air flow and surroundings. Velocity of air flow. (a) Surface and centerline temperatures of the wire, (b) Effect of flow velocity and ... stream velocity and temperature of air coolant. (a) Average pin convection coefficient, (b) Pin heat transfer rate, (c) Total heat rate, (d) Effect of velocity and pin diameter on total heat rate....

fundamentals of heat and mass transfer solutions manual phần 6 docx

... temperature, volume and properties of pharmaceutical. Heat transfer coefficient at outer surface and dimensions of coil.FIND: (a) Expressions for Tc(t) and Th,o(t), (b) Plots of Tc(t) and Th,o(t) ... 8.34KNOWN: Flow rate and inlet temperature of water passing through a tube of prescribed length,diameter and surface temperature.FIND: (a) Outlet water temperature and rate of heat transfer to water ... 8.35KNOWN: Diameters and thermal conductivity of steel pipe. Temperature and velocity of water flowin pipe. Temperature and velocity of air in cross flow over pipe. Cost of producing hot water.FIND:...

fundamentals of heat and mass transfer solutions manual phần 8 ppsx

... =0.8 47 and ε = 1 – exp (-NTU) = 0. 571 . From Eq. (1), the air outlet temperature is then()()c,o c,i h,i c,iT T T T 17 C 0. 571 1 27 17 C 79 .8 Cε=+ − =°+ −°=°<The rate of heat transfer ... (a) Overall heat transfer coefficient, U, for the HXer, outlet temperature of cooling water, Tc,o, and condensation rate of the steam hm; and (b) Compute and plot Tc,o and hm as ... = 0.199 and qmax = Cmin(Th,i- Tc,i) = 4.16 × 104 W/K(410 K) = 1 .71 × 10 7 W. Hence, ε = (q/qmax) = (1.254 × 10 7 W/1 .71 × 10 7 W) =0 .73 5. With Cmin mixed and Cmax...

fundamentals of heat and mass transfer solutions manual phần 9 ppt

... dissipationrate, M is the mass of PCM, and hfg is the heat of fusion of PCM.Irradiation: G = σTw = 5. 67 × 10-8 W/m2⋅K4(1200 K)4 = 1 17, 573 W/m2Emissive power: Eb = ( )442mT 872 73952W/mσσ=+=Emissivity: ... (Table 12.1)ε = 0.8 67 Absorptivity: α = α1 F(0-λT) + α2(1 –F(0-λT)) λT = 5 × 1200 = 6000 µm⋅Kα = 0.005 × 0 .73 78 + 0.9 (1 – 0 .73 78) F0-λT = 0 .73 78 (Table 12.1)α = 0. 273 Substituting numerical ... allowable value of Ts = 1800 K, it follows that84 84 84o0.391 5. 67 10 (2400) 0.8 5. 67 10 (300) 2 0.46 5. 67 10 (1800)h(1800 300)−− −×× +×× −×××=−5252o 7. 335 10 3. 674 10 5. 476 10h 126W...

fundamentals of heat and mass transfer solutions manual phần 10 doc

... of heat transfer to tube without ash deposit, (b) Rate of heat transfer with an ash deposit of diameter Dd = 0.06 m, (c) Effect of deposit diameter and convection coefficient on heat rate and contributions ... Dimensions and emissivity of double pane window. Thickness of air gap. Temperatures of room and ambient air and the related surroundings.FIND: (a) Temperatures of glass panes and rate of heat transfer ... 13.111KNOWN: Diameters and temperatures of a heated tube and a radiation shield.FIND: (a) Total heat loss per unit length of tube, (b) Effect of shield diameter on heat rate.SCHEMATIC:ASSUMPTIONS:...

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