Document XO53gvGkEQX8MgvyX4BrdD67R

588 CHAPTER 22 1957 Guide :r Table 1. Column-Type Cast-Iron Radiator Height laches 15 20 26 45 Generally Accepted Ratino per Section One Column Sq Ft Btu/hr 360 m 400 2 480 2*s 600 3 720 Two Column " Sq Ft Btu/hr 1H 360 2 480 2*4 540 560 2H 640 m 800 4 960 5 1200 Three Column Sq Ft Btu/hr 2H 540 3 720 m 900 4*4 1080 5 1200 6 1440 Four Column Five Column Six Column Sq Ft Btu/hr Sq Ft Btu/hr Sq Ft Btu/hr 13 18 3 720 4H 1120 4 960 26 5 1200 7 32 . . 6*4 1560 38 8 1920 10 45 10 2400 1680 2400 3 720 3*4 900 4*4 1080 5 1200 These ratings are based on steam at 215 F and air at 70 F. They apply only to installed radiators exposed m a normal manner; not to radiators installed behind enclosures, grilles, or under shelves, por mu per hour ratings at other temperatures, divide table values by factors found in Table 7. Table 2. LargetTube Cast-Iron Radiators ...Seetlonal, cast-iron, tubular-type radiators of the large-tube pattern, that is, having tubes approximately 1M n. in diameter, 2H in. on centers. Number of Tubes per Section Catalog Rating per Section* Sq Ft Btu/hr Height In. Width In. Section Center Spacing Leg Height' To Tapping In. In. 1*4 420 20 2 480 23 2H 560 26 3 720 32 3*4 840 38 2*4 2*4 4*4 2*4 2*4 2H 4*4 4*4 4um*s4 22*H4 540 600 2*4 660 3*4 840 4*4 1020 20 23 2*4 26 6*4-6iMsJ 2*4 32 38 22*H4 4*4 m4*4 4M 5 2H 3 3*4 4*4 5 640 720 840 1040 1200 20 23 26 32 38 S-SWfl mi 4*4 mm2mWdddi 4*4 . 4*4 4m*4 3 720 3*4 840 4 960 5 1200 6 1440 2H 600 3 720 3?S 880 20 23 26 32 38 14 17 20 9-10*4 U*6-12`M 2*4 2*4 2*4 2*4 2 2*4 2m*4 4m*4 4*4 4m*4 3 3 3 or 4*4 These lutings 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. *VKU P61" hour raV?gs at ot^er temperatures, divide table values by factors found in Table 7. e assembly 60 sections. Length equals number of sections times 2H in. Where greater than standard leg heights are required, this dimension shall be 6 in., except for 7-tube sections, in heights from 13 to 20 in., inclusive, for which this dimension shall be 4*4in. Radiators may be furnished without legs. For 5-tube hospital-type radiation, this dim<>ninp is 3 ia. Radiators, Convectors, Baseboard and Finned Tube Units 589 it emits and is generally expressed in units of: Btu per hr; Mbh (1000 Btii 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 since many 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 1J 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-Tube Cast-Iron Radiators Number op Tubes per Section 3d 4d 5d 6d Catalog per ' Section Dimensions AB Width C Height0 Spacing1* Minimum MftTimnm D Height0 Sq Ft Btu/hr 1.6 384 1.6 384 1.8 432 2.0 480 2.1 504 2.4 576 2.3 552 3.0 720 3.7 888 In. 25 19 22 25 22 25 19 25 32 In. 3H 4*4# 4*4# 4*4# m SH 6>Me 6**4# 6i*le In. m 4i*fe 4>$4# 4i*i 6Mo 6*4# 8 8 8 In. w m m 1H lH m m m In. . m m2H 2*4 2M 2H m2H 2*4 rci --e-- (j o ,. InJU i 0 . * These ratings am 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 ratingB at other temperatures, divide table values by factors found in Table 7. b Length equals number of sections times IK iu. 6 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 >?hll be 4)4 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. Walt 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 >n 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