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//Variable declaration:
scfm = 20000.0 //Volumetric flow rate of air at standard conditions (scfm)
H1 = 1170.0 //Enthalpy at 200°F (Btu/lbmol)
H2 = 14970.0 //Enthalpy at 2000°F (Btu/lbmol)
Cp = 7.53 //Average heat capacity (Btu/lbmol.°F)
T1 = 200.0 //Initial temperature (°F)
T2 = 2000.0 //Final temperature (°F)
//Calculation:
n = scfm/359.0 //Flow rate of air in a molar flow rate (lbmol/min)
DH = H2 - H1 //Change in enthalpy (Btu/lbmol)
DT = T2 - T1 //Change in temperature (°F)
Q1 = n*DH //Heat transfer rate using enthalpy data (Btu/min)
Q2 = n*Cp*DT //Heat transfer rate using the average heat capacity data (Btu/min)
//Result:
printf("The heat transfer rate using enthalpy data is : %.2f x 10^5 Btu/min.",Q1/10**5)
printf("The heat transfer rate using the average heat capacity data is : %.2f x 10^5 Btu/min.",Q2/10**5)
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