Loss of Heat from Covered Steam Pipes 



Consider a square foot and let its temperature be 125 F., 

 and that of the surrounding objects and air 85 F. , then the excess 

 of temperature will be 40 degrees. 



The loss per square foot per hour due to radiation will be, 

 RY. 40=(-747X i.iyX 1. 1 2) (40) =39.2. 



"The loss of heat arising from air contact is independent of 



the nature of the surface of the body, and of the absolute temper- 

 ature of the surrounding air ; it depends solely on the excess 

 of temperature of the surface of the body over the temperature 

 of the surrounding air, and on the form and dimensions of the 

 body." 



Figure 4, for horizontal cylinders, and Figure 5 for vertical 



