Document daK23KGJxYn6vLpnjQyY3LERQ

520 Height Inches 13 15 16 18 20 22 32 38 46 CHAPTER 22 1951 Guide Table 1. Column Type Cast-Ibon Radiator Generally Accepted Rating peh Section--Sq IV One Column Two Column Three Column Four Column Five Column Six Column or Window IK 2)i 3 IH 3 2X 3 4 IK 2M 2 2K 3K 5 2H ,3 SK 4 4H 5 1 6 6 15 3H 4K 7 10 eta^m at 215 7 in air at 70 F. These ratings apply only to installed radiators exposed in a normal manner not^toradiatan installed behind enclosures, grilles, or under shelves. (See A.S.H.VJ2. Code for Testing 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 If in. per section, are about the only available cast-iron radiating surface for homes and office Table 2. Large-Tube Cast-Ibon Radiators . Sectional, cast-iron, tubular-type radiators of the large-tube pattern, that is, having tubes approximately U in. m diameter, 2|m. on centers. * * # * The square foot ofequivalent direct steam radiation b defined as the ability to emit 240 Btu per hr with steam at 2151 m air at 70 F. These ratings apply only to installed radiators exposed in a normal man* RiuibtoiB) rftdia^0r8 msta^ed behind endosures, grilles, or under sheives. (See A.S.H.V.E. Code for Testing 6 Maximum assembly 60 sections. Length equals number of sections times 24 in. 0 Where greater than standard'leg heights are required, this dimension shall be 6 in., except for 7-tube sections, m heights from 13 to 20 in., inclusive, for which this dimension shall be 44 in. PndiflWa mav be furnished without legs. . 4 For 6-tube hospital-type radiation, thin dimension b 3 izu Radiators and Convectors 521 Table 3. Small-Tube Cast-Ibon Radiators Number op Tubes peb Section 3d 4d 5d 6* Catalog Rating PEB Section* Sq Ft 1.6 1.6 1.8 2.0 2.1 2.4 2.3 3.0 3.7 Section Dimensions ABC Width Height0 Minimum MaTimnm Spacing^ D Leg Height0 In. In. In. In. In. 25 3K SM IK 2H 19 .22 25 4% 4% 4X 4% 4% 4% li 2H 22HH 22 25 6K 5K 6* 6X IK IK Si ig in19 6% 8 IK 2K 25 6% 8 ' 32 6% 8 rci ----8--. (i O I tofep- 7D * The square foot of equivalent direct steam radiation b defined as the ability to emit 240 Btu per hr. with steam at 215 F, in air of 70 F. These ratings apply only to installed radiators exposed in a normal man ner; not to radiators installed behind enclosures, grilles, etc. (See A.S.H.V.E. Code for Testing Radiators adopted January, 1927). b length equals number of sections times 1$ in. e Overall height and leg height, as produced by some manufacturers, are one inch (1 in.) greater than shown in Columns A and D. Radiators may be furnbhed without legs. Where greater than standard leg hAighte are required this dimension shall be 4J in. d Or equal. 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 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 now rated in terms of equivalent square feet of direct radiation EDR. Tests have shown that the heat emitted from a wall-type 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. Baseboard radiation consists of long, low units which are made to resemble conventional baseboards, and are installed along the outside walls of rooms in place of the usual wooden baseboard. Units are made either of hollow cast-iron panels (with, or without fins on the back) or of ferrous or nonferrous finned tubing installed behind a metal enclosure. They are pri- Table 4. Cast-Iron .Wall Radiators Height 13K 13H 22 13K 29 Approximate Dimensions--Inches Length or Width 18H 22 13K 29 I3K Thickness 3 3 3 3 3 Heat Output, EDR 6H 11 11 /