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diff --git a/3685/CH15/EX15.3/Ex15_3.sce b/3685/CH15/EX15.3/Ex15_3.sce
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+clc
+Psat = 2.339 // Saturation pressure in kPa
+fi3 = 0.50 // Humidity ratio
+P = 101.3 // Atmospheric pressure in kPa
+cp = 1.005 // Constant pressure heat addition in kJ/kg
+Pw3 = fi3*Psat // Vapor pressure
+Pa3 = P-Pw3 // Air pressure
+W3 = 0.622*(Pw3/Pa3) // Specific humidity
+Psa1_1 = 0.7156 // Saturation pressure in kPa
+Pw1 = 0.7156 // moister pressure in kPa 
+Pa1 = P-Pw1 // Air pressure
+W1 = 0.622*(Pw1/Pa1)  // Specific humidity
+W2 = W1 // Constant humidity process
+T3 = 293 // Temperature at state 3 in K
+Ra = 0.287 // Gas constant
+Pa3 = 100.13 // Air pressure at state 3
+va3 = (Ra*T3)/Pa3 // volume of air at state 3
+SW = (W3-W1)/va3 // spray water 
+tsat = 9.65 // Saturation temperature in K
+hg = 2518 // Enthalpy of gas in kJ/kg
+h4 = 10 // Enthalpy at state 4 in kJ/kg
+t3 = T3-273
+t2 = ( W3*(hg+1.884*(t3-tsat))-W2*(hg-1.884*tsat) + cp*t3 - (W3-W2)*h4 )/ (cp+W2*1.884)
+printf("\n Example 15.3\n")
+printf("\n Mass of spray water required is %f kg moisture/m^3",SW)
+printf("\n Temperature to which air must be heated is %f degree celcius",t2)
+//The answers vary due to round off error
+
diff --git a/3685/CH15/EX15.3/Ex15_3.txt b/3685/CH15/EX15.3/Ex15_3.txt
new file mode 100644
index 000000000..7c043b7b0
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+ 
+ Example 15.3
+
+ Mass of spray water required is 0.003381 kg moisture/m^3
+ Temperature to which air must be heated is 27.082721 degree celcius
+\ No newline at end of file