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diff --git a/3685/CH15/EX15.12/Ex15_12.sce b/3685/CH15/EX15.12/Ex15_12.sce
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+
+clc
+// Given that
+c = 75 // Capacity of classroom in no of persons
+DBT1 = 35 // Outdoor Dry bulb temperature in degree celsius
+RH1 = 70 // Outdoor relative humidity in percentage
+DBT2 = 20 // Indoor Dry bulb temperature in degree celsius 
+RH1 = 60 // Indoor relative humidity in percentage
+DPT = 10 // Cooling coil dew point temperature in degree celsius
+x =0.25 // Bypass factor
+f = 300 // Air flow rate in cmm
+printf("\n Example 15.12 \n")
+// From the psychrometric chart 
+W1 = 0.0246 // In kg vap./kg d.a.
+h1 = 98 // In kJ/kg
+v1 = .907 // In m^3/kg d.a.
+h3 = 42 // In kJ/kg
+W3 = 0.0088 // In kg moisture/kg d.a.
+h2 = 34 // In kJ/kg
+hs = 30 // In kJ/kg
+t2 = 12 // In degree celsius
+G = f/v1
+C = G*(h1-h2)/(60*3.5)
+X = (h2-hs)/(h1-hs)
+C_ = G*(h3-h2)/60
+t4 = (DBT2-x*t2)/(1-x)
+C_H = G*(W1-W3)
+printf("\n Capacity of cooling coil is %f tonnes,\n Bypass factor of cooling coil is %f,\n Capacity of heating coil is %f kW,\n Surface temperature of heating coil is %f degree celsius,\n Mass of water vapor removed is %f kg/min ",C,X,C_,t4,C_H)
+//Answers varies due to round off error
diff --git a/3685/CH15/EX15.12/Ex15_12.txt b/3685/CH15/EX15.12/Ex15_12.txt
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+ 
+ Example 15.12 
+
+ Capacity of cooling coil is 100.803276 tonnes,
+ Bypass factor of cooling coil is 0.058824,
+ Capacity of heating coil is 44.101433 kW,
+ Surface temperature of heating coil is 22.666667 degree celsius,
+ Mass of water vapor removed is 5.226020 kg/min 
+\ No newline at end of file