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Ayrıntılar CALCULATIONS Properties of isopropanol
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İsimCALCULATIONS Properties of isopropanol
AçıklamaCALCULATIONS Properties of isopropanol `T = 51.5°C m = 1.028 cp Cp = 3096.17 J/kg K k = 0.129W/mK r = 762 kg/m2 Properties of water : `T = 71 m = 0.407 cp Cp = 4189.5 J/kg K k = 0.664W/mK r = 977.8 kg/m2 Flow rate of isopopanol = 65 000 kg/ h mi = 18.06 kg/s Q given = Qtaken = mi*Cp*DT =18.06*3096.17*( 72- 31) =2292590 J/s Q given =m* Cp*DT 2292590 = mw*4189.5*(97-45) mw = 10.52 kg / s Assumed overall heat transfer coefficient : 400 W/mK 97 72 DTLM= (97-72)-(45-31) = 18.97° C 45 In (97-72) (45-31) Q = A*Uİ*DTLM*F 2292590 = A*400*18.97*0.9 A= 335.7 From appendix A ; F= 0.9 Selected type of tubes ; ¾ inch 14 BWG Xw = 0.0021 m Dti= 0.0148 m Dto=0.01905 m Si ;= 1.73 10-4 m2 Assumed length of tubes : L = 20 ft (6.1m) Area of the one tube : Atube = p*Dti*L = p*0.0148*6.1 =0.28 m2 Number of the tubes ; Ntubes = Heat transfer area = 335.7 = 1199 tubes Area of one tube 0.28 Number of tubes at the shell diameter ; NDtube = 4* Ntubes = 40 p Diameter of the shell side : Ds = (NDtube –1) *2.54 10-2 + Dto = (40-1)*2.54.10-2 + 0.01905 = 1 m TUBE SIDE m = u*r*S*Nt / 4 10.52= uwater*977.8*1.73.10-4*1199/ 4 uwater = 0.2 m/ s Re = D*u*r = 0.0148*0.2*977.8 = 5689 Turbulent flow 0.407.10-3 From SEIDER EQUATION ismi doğrumu? h i D ti = 0.023 ( Re)0.8 (Pr)0.33( m /mw)0.14 k Pr = Cp*m = 4189.5*0.407.10-3 = 2.57 k 0.664 ( m /mw)0.14 = (1.028/ 0.83)0.14 = 1.03 h i D ti = 0.023 ( 5689 )0.8 (2.57)0.33(1.23)0.14 ...
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Ekleme tarihi: 15.10.2008 16:13
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En son güncelleme 14.10.2008 16:14
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