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+//Variable declaration:
+T1 = 2000                       //Hot gas temperature ( F)
+T2 = 550                        //Cool gas temperature ( F)
+T3 = 330                        //Steam temperature ( F)
+T4 = 140                        //Water temperature ( F)
+m = 30000                       //Mass flow rate of steam (lb/h)
+cp = 0.279                      //Average heat capacity of gas (Btu/lb. F)
+N = 800                         //Number of boiler tubes
+
+//Calculation:
+DT = (T1-T3)/(T2-T3)            //Temperature difference ratio
+Tav = (T1+T2)/2                 //Average gas temperature ( F)
+//From steam tables (Appendix):
+hs = 1187.7                     //Steam enthalpy (Btu/lb)
+hw = 107.89                     //Water enthalpy (Btu/lb)
+Q = m*(hs-hw)                   //Heat duty (Btu/h)
+mh = Q/cp*(T1-T2)               //Mass flow rate of gas (lb/h)
+x = mh/N                        //Gas mass flow rate per tube (lb/h)
+//From figure 18.5:
+L = 15                          //Length of boiler tubes (ft)
+
+//Result:
+printf("The length of boiler tubes is : %f ft .",L)