initial commit / add all books

1 files changed, 36 insertions, 0 deletions

diff --git a/32/CH11/EX11.20/11_20.sce b/32/CH11/EX11.20/11_20.sce
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+//pathname=get_absolute_file_path('11.20.sce')

+//filename=pathname+filesep()+'11.20-data.sci'

+//exec(filename)

+//Height of chimney(in m):

+H=45

+//Temperature of burnt gases(in K):

+Tg=630

+//Air requirement(in kg air per kg of fuel burnt):

+m=15

+//Ambient air temperature(in K):

+Ta=300

+//Minimum temperatre of artificial draught(in K):

+Tga=150+273

+//Specific heat of flue gases(in kJ/kg.K):

+Cpg=1.005

+//Calorific value of fuel(in kJ/kg):

+C=30000

+//Draught (in mm of water column):

+hw=353*H*(1/Ta-(m+1)/(m*Tg))

+//Draught (in metres of hot gas column):

+hg=H*(m/(m+1)*Tg/Ta-1)

+//Temperature of chimney for maximum discharge(in K):

+Tgmax=Ta*2*(m+1)/m

+//Chimney efficiency:

+n=9.81*H*(m/(m+1)*Tg/Ta-1)/(Cpg*(Tg-Tga)*10^3)*100

+//Extra heat carried away by flue gases(in kJ):

+Q=(m+1)*Cpg*(Tg-Tga)

+//Percentage heat spent in natural draught:

+nn=Q/C*100

+printf("\n RESULT \n")

+printf("\nDraught = %f mm of water",hw)

+printf("\nDraught = %f metres of hotgas column",hg)

+printf("\nTemperature of chimney gases for maximum discharge = %d K",Tgmax)

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

+printf("\nExtra heat carried away by flue gases per kg of fuel burnt = %f kJ",Q)

+printf("\nPercentage heat carried away in natural draught = %f percent",nn)
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