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diff --git a/3878/CH21/EX21.8/Ex21_8.sce b/3878/CH21/EX21.8/Ex21_8.sce
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+clear
+// Variable declaration
+T_d1=24// The dry bulb temperature in °C
+T_d2=7// The dry bulb temperature in °C
+H=45//  % saturation
+cf=0.78// Contact factor
+h_1=45.85// The enthalpy in kJ/kg
+h_2=22.72// The enthalpy in kJ/kg
+
+// Calculation
+//(a) By construction on the chart ( Figure 21.9 ), 10.7°C dry bulb, 85% saturation.
+//(b) By calculation, the dry bulb will drop 78% of 24 to 7°C:
+dT=T_d1-(cf*(T_d1-T_d2))// The drop in dry bulb temperature in °C
+dh=h_1-(cf*(h_1-h_2))// The drop in enthalpy in kJ/kg
+printf("\n \nThe drop in dry bulb temperature=%2.1f°C \nThe drop in enthlpy=%2.2f kJ/kg",dT,dh)
+