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diff --git a/1309/CH9/EX9.2/ch9_2.sce b/1309/CH9/EX9.2/ch9_2.sce
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+clc;
+clear;
+printf("\t\t\tChapter9_example2\n\n\n");
+// Determination of the LMTD for both counterflow and parallel-flow configurations. 
+// temperatures of hot fluid in degree F
+T1=250;
+T2=150;
+// temperatures of cold fluid in degree F
+t1=100;
+t2=150;
+// for counterflow
+LMTD_counter=((T1-t2)-(T2-t1))/(log((T1-t2)/(T2-t1)));
+printf("\nThe LMTD for counter flow configuration is %.1f degree C",LMTD_counter);
+// for parallel flow
+printf("\nFor a finite heat-transfer rate and  a finite  overall heat-transfer coefficient,\nif parallel flow is to give  equal  outlet  temperatures,\nthen the area  needed  must be infinite which is not feasible economically.");