initial commit / add all books

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+//Variable declaration:
+T_sat = 126.0                   //Saturation temperature (°F)
+T = 64.0                        //Surface temperature of tube (°F)
+g = 32.2                        //Gravitational acceleration (ft^2/s)
+D = 4.0/12.0                    //Outside diameter of tube (ft)
+
+//Calculation:
+Tf = (T_sat+T)/2.0               //Mean film temperature (°F)
+//From approximate values of key properties:
+h_vap = 1022.0                  //Latent heat of steam (Btu/lb)
+p_v = 0.00576                   //Density of steam (lb/ft^3)
+p_l = 62.03                     //Density of liquid (lb/ft^3)
+k_l = 0.364                     //Thermal conductivity of liquid (Btu/h.ft.°F)
+mu_l = 4.26*10**-4              //Absolute viscosity of liquid water condensate (lb/ft.s)
+h = 0.725*((p_l*(p_l-p_v)*g*h_vap*k_l**3)/(mu_l*D*(T_sat-T)/3600.0))**(1.0/4.0)   //Average heat transfer coefficient (Btu/h.ft^2.°F)
+
+//Result:
+printf("The average heat transfer coefficient is : %.1f Btu/h.ft^2.°F.",h)