. Building with assurance . etwo column radiators. 1800 cu. ft. of space in it,200 sq. ft. of exposed wall,70 sq. ft. of exposed single glass,180 sq. ft. of ceiling (floor above). —10° to +700 = 80° difference. Temp, steam 220° —70° temp, room = 150° X = 232 B. T. U. per sq. ft. of heating surface per hr. Referring to the constants for 80° temper-ature difference, we have the following lossesthrough the various materials: 1800 cu. ft. X =3031 B. T. U. 200 sq. ft. wall x (80° diff. x 35) =5600 B. T. U. 70 sq. ft. glass x (80° x ) =6104 B. T. U. 180 sq. ft. ceiling x (80° x .26) =
. Building with assurance . etwo column radiators. 1800 cu. ft. of space in it,200 sq. ft. of exposed wall,70 sq. ft. of exposed single glass,180 sq. ft. of ceiling (floor above). —10° to +700 = 80° difference. Temp, steam 220° —70° temp, room = 150° X = 232 B. T. U. per sq. ft. of heating surface per hr. Referring to the constants for 80° temper-ature difference, we have the following lossesthrough the various materials: 1800 cu. ft. X =3031 B. T. U. 200 sq. ft. wall x (80° diff. x 35) =5600 B. T. U. 70 sq. ft. glass x (80° x ) =6104 B. T. U. 180 sq. ft. ceiling x (80° x .26) =3744 B. T. U. 18479 B. T. -=- 232 = 79 sq. ft. of 2 column radiation. Ten per cent should be added for northernexposures and where the winds are to becounted on as an important factor. The aboveroom would then have sq. ft. of 2 columnradiation or 87 sq. ft. Radiators Radiators should be located along the out-side walls, preferably under the windows, andshould be of the single- or double-column type. ^^^^ ^ and of low height, as they are more efficientthan the higher radiators. The single-columnmakes for a neater appearance and does notoccupy as much room as the three and fourcolumn type. They are better heat emittersand you thereby require a slightly less amountof radiation to do the work. See that radiatorsare kept clean, provide yourself with a narrowbristle brush made especially for that purposeor preferably a vacuum cleaner. Boiler In estimating the size of the boiler requiredfor the home, the square feet of surface on allmains and risers used on the job should beconsidered in connection with the radiatorsto be installed. This additional surface shouldbe carefully figured out and considered withreference to the amount of steam it condenses,or its cooling effect on water. If radiation other than the direct form isused, the boiler capacity must be increasedin proportion as those surfaces may condensesteam or cool the water more rapidly thandirect rad
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