diff options
Diffstat (limited to '1328/CH16/EX16.2')
-rw-r--r-- | 1328/CH16/EX16.2/16_2.sce | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/1328/CH16/EX16.2/16_2.sce b/1328/CH16/EX16.2/16_2.sce new file mode 100644 index 000000000..0594ebde2 --- /dev/null +++ b/1328/CH16/EX16.2/16_2.sce @@ -0,0 +1,41 @@ +printf("\t example 16.2 \n");
+printf("\t approximate values are mentioned in the book \n");
+Ts=302; // F
+t1=151;
+t2=185;
+w=15200; // lb/hr
+// The dropwise condensation of steam was promoted with oil.
+aa=(3.14*(3.068^2-1.25^2))/(4*144)-((20*0.035*0.75)/(144));
+printf("\t annulus flow area : %.4f ft^2 \n",aa);
+p=(3.14*(1.25/12))-(20*0.035/12)+(20*0.75*2/12);
+printf("\t wetted perimeter : %.2f ft \n",p);
+De=(4*aa/p);
+printf("\t equivalent diameter : %.3f ft \n",De);
+Q=w*0.523*(t2-t1);
+printf("\t heat load : %.2e Btu/hr \n",Q);
+delt1=Ts-t1; //F
+delt2=Ts-t2; // F
+printf("\t delt1 is : %.0f F \n",delt1);
+printf("\t delt2 is : %.0f F \n",delt2);
+LMTD=((delt2-delt1)/((2.3)*(log10(delt2/delt1))));
+printf("\t LMTD is :%.0f F \n",LMTD);
+Ai=0.277; // ft^2/ft
+n=20; // number of fins
+Ui=(Q/(Ai*n*LMTD));
+printf("\t Ui : %.0f Btu/(hr)*(ft^2)*(F) \n",Ui);
+hi=3000; // assumed value for dropwise condensation of steam
+hfi=(Ui*hi)/(hi-Ui);
+printf("\t hfi : %.0f Btu/(hr)*(ft^2)*(F) \n",hfi);
+hf=120; // from fig 16.7 for hfi=418
+mu=1.94; // lb/(ft*hr)
+k=0.079;
+Z=2.34; // Z=((c*mu)/k)^(1/3)
+jf=(hf*De/(Z*k)); // eq 16.36
+printf("\t jf : %.0f \n",jf);
+Ga=(w/aa);
+printf("\t Ga : %.2e lb/(hr)*(ft^2) \n",Ga);
+Rea=(De*Ga/mu);
+printf("\t Rea : %.2e \n",Rea);
+// end
+
+
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