Cyclopedia of heating, plumbing and sanitation; a complete reference work . Trombone Coil. Used when 11 must be Placed on One Side of Room Only when wall coils or radiators would be in the way of fixtures, orwhen they would come below the water-line of the boiler if placednear the floor. When steam i> firsl tinned on a coil, it usually passes through a. Fig. 22. Miter Coil. Adapted, like the Trombone, Only to a Single [uently Used in Factories and Shops. portion of the pipes first and heats them while the others remain coldand full of air. Therefore the coil must always be ma
Cyclopedia of heating, plumbing and sanitation; a complete reference work . Trombone Coil. Used when 11 must be Placed on One Side of Room Only when wall coils or radiators would be in the way of fixtures, orwhen they would come below the water-line of the boiler if placednear the floor. When steam i> firsl tinned on a coil, it usually passes through a. Fig. 22. Miter Coil. Adapted, like the Trombone, Only to a Single [uently Used in Factories and Shops. portion of the pipes first and heats them while the others remain coldand full of air. Therefore the coil must always be made up in sucha way that each pipe shall have a certain amount of spring and mayexpand independently without bringing undue strains upon the coils should incline about 1 inch in 20 feet tow/ard the 56 HEATING AND VENTILATION 17 return end in order to secure proper drainage and quietness of opera-tion. Efficiency of Radiators. The efficiency of a radiator—that is,the B. T. U. which it gives off per square foot of surface per hour—depends upon the difference in temperature between the steam in theradiator and the surrounding air, the velocity of the air over theradiator, and the quality of the surface, whether smooth or ordinary low-pressure heating, the first condition is practicallyconstant; but the second varies somewhat wit
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