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Diffstat (limited to '3685/CH8/EX8.8/Ex8_8.sce')
| -rw-r--r-- | 3685/CH8/EX8.8/Ex8_8.sce | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/3685/CH8/EX8.8/Ex8_8.sce b/3685/CH8/EX8.8/Ex8_8.sce new file mode 100644 index 000000000..a46d192e0 --- /dev/null +++ b/3685/CH8/EX8.8/Ex8_8.sce @@ -0,0 +1,34 @@ + +clc +T0 = 300 // Atmospheric temperature in K +Tg1_ = 300 // Higher temperature of combustion product in degree Celcius +Tg2_ = 200 // Lower temperature of combustion product in degree Celcius +Ta1 = 40 // Initial air temperature in K +cpg = 1.09 // Specific heat capacity of combustion gas in kJ/kgK +cpa = 1.005// Specific heat capacity of air in kJ/kgK +mg = 12.5 // mass flow rate of product in kg/s +ma = 11.15// mass flow rate of air in kg/s + +printf("\n Example 8.8") +Tg1 = Tg1_+273 // Higher temperature of combustion product in K +Tg2 = Tg2_+273 // Lower temperature of combustion product in K +f1 = cpg*(Tg1-T0)-T0*cpg*(log(Tg1/T0)) // Initial availability of product +f2 = cpg*(Tg2-T0)-T0*cpg*(log(Tg2/T0)) // Final availability of product +printf("\n The initial and final availability of the products are %f kJ/Kg and %f kJ/Kg respectively",f1,f2) +//The answer provided in the textbook is wrong + +// Part (b) +Dfg = f1-f2 // Decrease in availability of products +Ta2 = (Ta1+273) + (mg/ma)*(cpg/cpa)*(Tg1-Tg2) // Exit temperature of air +Ifa = cpa*(Ta2-(Ta1+273))-T0*cpa*(log(Ta2/(Ta1+273))) // Increase in availability of air +I = mg*Dfg-ma*Ifa // Irreversibility +printf("\n The irreversibility of the process is %f kW",I) +////The answer provided in the textbook contains round off error + +// Part (c) +Ta2_ = (Ta1+273)*(Tg1/Tg2)^((12.5*1.09)/(11.5*1.005)) +Q1 = mg*cpg*(Tg1-Tg2) // Heat supply rate from gas to working fluid +Q2 = ma*cpa*(Ta2_-(Ta1+273))// Heat rejection rate from the working fluid in heat engine +W = Q1-Q2 // Power developed by heat engine +printf("\n Total power generated by the heat engine is %f kW",W) +//The answer provided in the textbook contains round off error |