GREENHOUSE HEATING 



195 



The preceding table gives the standard sizes and principal dimensions 

 3f wrought-iron pipe. From this table the amount required for a 

 given amount of radiating surface can be readily computed. This pipe 

 can be purchased of any dealer. 



To design heating plant. 



1. Find radiating surface by dividing area of glass in square feet 

 by results in table A. Hot water pipes can be kept at a temperature 

 of 180° F. if desired. 



2. Find the size of grate by multiplying amount of radiating surface 

 by number of pounds of coal per square foot of grate per hour divided 

 by " radiation per pound " in table A. 



3. Find size of main pipes by table B, using size next larger when 

 radiating surface comes between numbers given. It is usually better 

 to have several main and return pipes, and divide the radiating surface 

 in sections. 



Other Information relating to Heating 



Diameters for cylindrical chimney-flues, for given heights and boiler 

 capacities (R. C. Carpenter) 



Four-cornered chimneys are considered to be equivalent to cylindrical chim- 

 neys when the sides equal the diameter. 



