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diff --git a/1309/CH2/EX2.4/Result2_4.pdf b/1309/CH2/EX2.4/Result2_4.pdf
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+++ b/1309/CH2/EX2.4/Result2_4.pdf
diff --git a/1309/CH2/EX2.4/ch2_4.sce b/1309/CH2/EX2.4/ch2_4.sce
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+clc;
+clear;
+printf("\t\t\tChapter2_example4\n\n\n");
+// determination of the heat transfer through the pipe wall per unit length of pipe.
+k=14.4; // thermal conductivity of 304 stainless steel in W/(m.K) from appendix table B2
+// dimensions of steel pipes in cm from appendix table F1
+D2=32.39;
+D1=29.53;
+T1=40;
+T2=38;
+Qr_per_length=(2*3.14*k)*(T1-T2)/log(D2/D1);
+format(6);
+printf("\nThe heat transfer through the pipe wall per unit length of pipe is %.1f W/m = %.2f kW/m",Qr_per_length,Qr_per_length/1000);