Document QJ6DXZdQbYaxqJvrDE0Nr67VL

562 CHAPTER 23 1956 Guide Table 1. Column-Type Cast-Iron Radiator Generally Accepted Rating peb Section* Height Inches One Column Sq Ft Btu/hr . Two Column . Sq Ft ' Btu/hr Three Column Sq Ft Btu/hr 15 18 20 22 23 26 32 38 45 -- m m 2 2*4 3 360 400 480 600 720 Four Column m 360 2 480 2*4 540 2*4 560 2H 640 3*4 800 4 960 5 1200 Five Column . 2H 3 540 720 3*4 900 4*4 1080 5 1200 . 6 1440 Six column Sq Ft Btu/hr Sq Ft Btu/hr Sq Ft Btu/hr 13 16 18 3 720 4*4 1120 20 m22 26 4 5 060 1200 7 1680 ` 32 38 1560 8 1920 10 2400 45 10 2400 s* 720 900 1080 1200 * tors These ratings are oasea on si-etuu exposed in & normal manner; not a*. to radiaa'towrsuinstall*e d - . -___ -FF-^ behind enclosures, __ v .. grilles, or under shelves For Btu per hour ratings at other temperatures, divide table values by factors found in Table 8. Table 2. Large-Tube Cast-Iron Radiators Sectional, cast-iron, tubular-type radiators of the large-tube pattern, that is, having tubes approximately ti ;n >n Hiamatpr 21 in. n& centers. Number op Tubes peb 8ection Catalog Rating peb Section* Sq Ft Btu/hr Height In. Width In. Section Center Spacing6 Leg Height To Tapping In. Id. 1*4 2 2*4 3 3*4 2*4 2*4 2*4 3*4 4*4 2*4 3 3*4 4*4 5' 3 3*4 4 5 6 2*4 3 3*4 420 480 560 720 840 ' 540 600 660 840 1020 640 720 840 1040 1200 720 840 960 1200 1440 600 720 880 20 23 26 32 38 20 23 26 32 38 20 23 26 32 38 20 23 26 * 32 38 14 17 20 4*4 | 6*4-61*4 8-8*4* 9-10*4 11*4-12**4 2*4 2*4 2*4 2*4 2*4 2*4 2*4 2*4 2*4 244d w244d * 244d 244d 2*4 2*4 2*4 2*4 2*4 2*4 2*4 2*4 4*4 4*4 4*4 4*4 4*4 4*4 4*4 4*4 4*4 4*4 4*4 4*4 4*4 4*4 444 414 444 444 444 3 3 3 or 4*4 tors*eTxhpeosseedraintinagnsoarmreabl amseadnnoenr;stneoatmtoatra2d1i5atForsanindsatairlleadt 7b0ehFi.ndTehnecyloasuprpelsy, gurmillves,wor under-sh--elves. For Btu per hour ratings at other temperatures, divide table values by factors found in Table 6. 6c WMhaexriemgurmeaatesrsethmabnlys6ta0nsdeacrtdionlesg. hLeeignhgttshaerequraelqsuniruemd,btehrisofdsimecetinosnisontimsheasll21bein6. in., except for 7-tube sections, in heights from 13 to 20 in., inclusive, for which this dimension shall be 4} in. Radiators may be furnished without legs. d For 5-tube hospital-type radiation, this dimension is 3 in. Radiators, Convectors, Baseboard and Finned Tube Units 563 it emits and is generally expressed in units of: Btu per hr; Mbh (1000 Btur per hr); or in equivalent direct radiation (e.g., 240 Btu per hr for steam). RADIATORS Column and large-tube radiators are no longer manufactured, but sincemany of these units are still in use, Tables 1 and 2 are included to provide principal dimensions and average ratings of them. The small-tube type radiators, with a spacing of If in- per section, are about the only available cast-iron radiating surface for homes and office buildings. Small-tube radiators occupy less space than the older column and large-tube radiators, and are particularly suited for installation in recesses. After a study of the demand for various sizes of radiators, the Institute of Table 3. Small-Tobe Cast-Iron Radiators Numbeb OP Tubes peb Section 3d 4d 5d 6d Catalog Rating peb Section* Section Dimensions AB C Width Height Spacing6 Minimum Mftximnm D Leg Height Sq Ft Btu/hr In. In. In. In. In. 1.6 384. 25 1.6 384 1.8 432 2.0 480 19 22 25 2.1 504 2.4 576 22 25 2.3 552 19 3.0 720 . 25 3.7 888 32 344 4*4. 4He VAc 5H 5H 6JM 6*M 6*Me 344 4iM 444 4iM 6M 6M 8 8 8 m 144 144 144 m IH w m m 244 244 244 244 244 244 244 244 244 r*i ' 0-- il o ., InJi T D * These ratings are based on steam at 215 F and air at 70 F. They apply only to installed radia tors exposed in a normal manner; not to radiators installed behind enclosures, grilles* or under shelves. For Btu per hour ratings at other temperatures, divide table values by factors found in Table 6. 6 Length equals number of sections times \lA in. ? Overall height and leg height, as produced by some manufacturers, are one inch greater than shown in Columns A and D. Radiators may be-furnished without legs. Where greater than standard leg heights are required this dimension shall be 4M in. d Or equal. Boiler and Radiator Manufacturers, in cooperation with the Division of Simplified Practice, National Bureau of Standards, established Simplified Practice Recommendation R174-47 for small-tube cast-iron radiators. Table 3 shows the size and dimensions now being manufactured. Wall radiators are hung from wall brackets and are well adapted to use in factory buildings. Tests have shown that the heat emitted from a walltype radiator may be reduced from 5 to 10 percent if the radiator is placed near the ceiling with the bars horizontal and in an air temperature ex ceeding 70 F. When radiators are placed near the.ceiling, there is usually such a large difference in the temperature between the floor level and the ceiling that it becomes difficult to heat the living zone of the rooms satis factorily. Dimensions and heat emission rates for wall radiators are given in Table 4. CONVECTORS A typical recessed convector is shown in Fig. 1. The room air enters the convector enclosure near the floor line, below the heating element, is heated in passing through the element, and is delivered to the room through