. Hot water supply and kitchen boiler connections : a text book on the installation of hot water service in residences and other buildings and methods of connecting range boilers, steam and gas water heaters. to the water and the amount of water that should be HEATING WATER BY STEAM. 141 heated to the desired temperature by a given amount of surface,it is safe to allow a heating value of 15,000 heat units per sq. coil, and for water heaters suspended above the fire a muchlower rating, possibly 8,000 heat units is an ample allowance forthe ordinary conditions found in heating boilers and
. Hot water supply and kitchen boiler connections : a text book on the installation of hot water service in residences and other buildings and methods of connecting range boilers, steam and gas water heaters. to the water and the amount of water that should be HEATING WATER BY STEAM. 141 heated to the desired temperature by a given amount of surface,it is safe to allow a heating value of 15,000 heat units per sq. coil, and for water heaters suspended above the fire a muchlower rating, possibly 8,000 heat units is an ample allowance forthe ordinary conditions found in heating boilers and of equivalent heating surface in pipe coils: 1 ft. of % in. pipe = sq. ft. surface 45 in. of % in. pipe=:l sq. ft. surface 1 ft. of 1 in. pipe = sq. ft. surface 35 in. of 1 in. pipe = 1 sq. ft surface 1 ft. of 1% in. pipe = sq. ft. surface 28 in. of 1% in. pipe = l sq. ft. surface 1 ft. of iy2 in. pipe = sq. ft. surface 24 in. of ly^ in. pipe = l sq. ft. surface 1 ft. of 2 in. pipe = sq. ft. surface 20 in. of 2 in, pipe = l sq. ft. surface Besides the coils of copper or brass pipe and the cast ironheaters which are intended to be hung over the fire in warm. Fig. 105. Auxiliary Heater Made From a Radiator. air and other furnaces there are many other designs of auxiliaryheaters. Those which are made in the form of a ring or the partof a ring are common and as they may be fitted so that they arein contact with the fire they generally give efficient and satisfac-tory service. An ingenious arrangement is shown in Pig. 105,where a heater of considerable power and heating value is con-structed from the sections of an ordinary hot water radiator. Theheater is intended to be placed in the dome of a warm air furnaceand is made of radiator sections to the number and of such heightas the size of the furnace and the nature of the work performeddemand. If a heater is built up of 3 columns 18 in. high, therewill be a heating surface of about 7 sq.
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