From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

---
 2510/CH18/EX18.7/Ex18_7.sce | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100755 2510/CH18/EX18.7/Ex18_7.sce

(limited to '2510/CH18/EX18.7/Ex18_7.sce')

diff --git a/2510/CH18/EX18.7/Ex18_7.sce b/2510/CH18/EX18.7/Ex18_7.sce
new file mode 100755
index 000000000..68b181326
--- /dev/null
+++ b/2510/CH18/EX18.7/Ex18_7.sce
@@ -0,0 +1,35 @@
+
+//Variable declaration:
+F = 5000                        //Mass flow rate of NaOH (lb/h)
+xF = 20/100                     //Old concentration of NaOH solution
+TF = 100                        //Feed temperature ( F)
+xL = 40/100                     //New concentration of NaOH solution
+xv = 0                          //Vapour concentration at x
+yv = 0                          //Vapour concentration at y
+T1 = 198                        //Boiling temperature of solution in the evaporator ( F)
+T2 = 125                        //Saturated steam temperature ( F)
+U = 400                         //Overall heat transfer coefficient (Btu/h.ft^2. F)
+Ts = 228                        //Steam temperature ( F)
+
+//Calculation:
+//From steam tables at 228 F and 5 psig:
+hS = 1156                       //Enthalpy of steam (Btu/lb)
+hC = 196                        //Enthalpy of condensate (Btu/lb)
+hV = hS-hC                      //Enthalpy of vapour (Btu/lb)
+Tw = 125.4                      //Boiling point of water at 4 in Hg absolute ( F)
+hS2 = 1116                      //Enthalpy of saturated steam at 125 F (Btu/lb)
+hs = 0.46                       //Heat capacity of superheated steam (Btu/lb. F)
+//From figure 18.3:
+hF = 55                         //Enthalpy of feed (Btu/lb)
+hL = 177                        //Enthalpy of liquor (Btu/lb)
+L = F*xF/xL                     //Mass of liquor (lb)
+V = L                           //Mass of vapour (lb)
+hV = hS2+hs*(T1-T2)             //Enthalpy of vapour leaving the solution (Btu/lb)
+S = (V*hV+L*hL-F*hF)/(hS-hC)    //Mass flow rate of steam (lb/h)
+Q = S*(hS-hC)                   //Total heat requirement (Btu)
+A = Q/(U*(Ts-T1))               //Required heat transfer area (ft^2)
+S = round(S*10**-1)/10**-1
+
+//Result:
+printf("The steam flow rate is : %f lb/h .",S)
+printf("The required heat transfer area is : %.0f ft^2 .",A)
-- 
cgit