Document e75nvQr627rzVkVmwmroY8Z5e

504 CHAPTER 22 1950 Guide Table 1. Column Type Cast-Ibon Radiator Height - Column --Generally Accepted Rating peb Section Sq Ft4 Column Column Four Column Five Column Six Column or Window 13 15 16 18 20 22 23 26 32 ... 88 45 v3 IK 3Ya m 3 4H 4H U4 2 5 2H 3 4 \H 2% 2 2H w 5 7 2H 8 3K 4K 4 ,5 s* 8 10 6 6 , 10 * The square foot of equivalent direct steam radiation is defined as.the ability to emit 240 Btu per hr, with steam at 215 F in air at 70 F. These ratings apply only to installed radiators exposed in a normal manner; not to radiators installed behind enclosures, grilles, or under shelves;'. (See A.S.H.V.E. Code-for Testing Radiators.) - -- - - -- __' . .. ......... 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 ftjrnplifipH Practice, National Bureau of Standards, established Simplified Table 2. Large-Tube Cast-Iron Radiators Sectional*, cast-iron, tubular-type radiators of the large-tube pattern, that is, having tubes approximately 1} in. in diameter, 2} in. on centera. Number op * Tubes peb Section 8: 4 s .6 . 7 Catalog Rating peb . Section* Sq Ft . IK 2 2K 3 3K 2tf 2H 2H 3ji 4H 2H . 3 34V84 5 3 3M 4 5 6 2H 3 SK Height In. 20 23 26 32 38' 20 ' 23! 26 . 32 38 20. 23 28 32 38 20 23 26 32 38 14 17 20 Width ` Section Center Spacing5 Leo Height6 To Tapping In. In. In. iU 4H 4X . 4H , 2K 2K . 2K 2K 2K . 4X 4)| 4K ' 6K 6K *- 6* 6* 6K 2V4 2)4 - 2V4 2K 4K 4H 4K . -4H : -8 i - ; 2Kd 8N 8 - - ` 2Kd 8 . 2Hd .. 8 2Kd. 4K 4K . 4H 4)1 9% 9% . 9% ' 9% 9% 2V4 m' 2)1 . . 2Vi m ;1 4U 4Vi 4Ji 4Vi 4H UK 11H ' . ` UH 2H2K 3 3 2K 3 or 4)4 . .. * The square foot of equivalent-direct steam radiation is defined as the ability to emit .240 Btu -per. hr, with steam at 215 F in air at 70 F. These ratings apply only to installed radiators exposed in a normal man ner* hot to radiators installed behind enclosures, gnlles, or under shelves. (See A.S.H.V.E. Code for Testing, Radiators). ' *> MuTimnm assembly 60 sections. Length equals number of sections tunes 24 in.. - ` Where greater standard leg heights are required, this dimension shall1 be 6<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 legB. ' "For 5-tube hospital-type radiation, this dimension is 3in. . .. ." Radiators and Convectors 505 Table 3. Small-Tube Cast-Iron Radiators Numbeb op Tubes peb Section 3d . 4d 5d 6* Catalog Rating PBB Section* Sq Ft 1.6 . 1.6 1.8 2.0 2.1 2.4 2.3 . 3.0 3.7 Section Dimensions A Height4 B Width C Spacing5 Minimum Maximum D Leg Height4 In. In. . In- In. In. . . 25 19 22 25 3K 3K IK 2H 184% IK 4% IK 4X 4% IK 2K 22 SX 9% lH 2X 25 5H 9% 1H 2K 19 25 32 6% . 5% 9% 8 8 8 1IK IK IK e-- S! 0 , I Ur T InJ 0 * The square foot of equivalent direct steam radiation is 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 adojrted January, 1027). Length equals number of sections times lj in. 0 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 furnished without legB. Where greater than standard leg heights are required this dimension shall be '4} in. 3 Or equal. - Practice Recommendation R17447 for small-tube cast-iron radiators Table 3 shows the size and dimensions how 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 per cent if the radiator is placed near the ceiling with the bars horizontal and in an air temperature exceeding 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 marily used in hot water systems, but may also be used in tw`o-pipe steam systems. There are various kinds of baseboard radiation available,1 the radiant type and the convector type. Radiant baseboards have a substantial portion of the front face water backed, and do not depend upon an enclo- Table 4. Cast-Iron Wall Radiators Height - 13K 13K 22 13K 29 Approximate Dimensions--Inches ' Length or Width . 16)4 22 13K 29 I3K Thickness 3 3 3 3 3 Heat Output, EDR 6J4 8 . . 8. 11 11