initial commit / add all books

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diff --git a/32/CH11/EX11.15/11_15.sce b/32/CH11/EX11.15/11_15.sce
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+//pathname=get_absolute_file_path('11.15.sce')

+//filename=pathname+filesep()+'11.15-data.sci'

+//exec(filename)

+//Atmospheric air temperature: 15C

+//Steam generation: 40 bar, 400C

+//Steam generated per kg of coal = 8 kg

+//Feed water temperature at inlet to economiser = 27C

+//Feed water temperature at exit of economiser = 137C

+//Moisture in coal burnt = 1.5%

+//Flue gas temperature entering air heater =300C

+//Flue gas temperature leaving air heater and entering chimney = 150C

+//Temperature of air entering boiler furnace = 120C

+//Dry coal composition by mass = 84% C, 4% H2, 7% O2 and remainder ash

+//Dry flue gas composition by volume = 12.5% CO2, 7.5% O2, 80% N2

+//Datum temperature = 15C

+//Calorific value of coal = 32600 kJ/kg

+//For air and dry flue gas, cp =1.0032 kJ/kg K

+//Partial pressure of vapour in flue gas = 0.075 bar

+//Specific pressure of vapour = 2.0064 kJ/kg K

+//Mass of dry flue gas per kg of coal:

+md=0.84/0.0495

+//H2O produced during the combustion(in kg):

+mh=0.04*9

+//Amount of air supplied for combustion of one kg of dry coal(in kg):

+ma=16.97-(1-0.05-0.36)

+//Moisture per kg of dry coal(in kg):

+m=0.015/(1-0.015)

+//Total moisture per kg of coal(in kg):

+mt=mh+m

+//Steam generated per kg of dry coal(in kg steam):

+ms=8/(1-0.015)

+//Boiler efficiency:

+n=25178.01/32600*100

+//Efficiency of heat exchange in air heater:

+na=1725.4/2897.67*100

+printf("\n RESULT \n")

+printf("\nBoiler efficiency = %f percent",n)

+printf("\nEfficiency of heat exchange in air heater = %f percent",na)