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858 CHAPTER 55 1965 Guide And Data Book Table 1.... Column-Type Cast-Iron Radiator Generally Accepted Coring per Section* Table 2 .... Large-Tube Cast-Iron Radiators Ssefioad, coxt-iroo, tobdar-t/po rodmfor* of the fargo-tube pattern, (her h, having tube* cpproxfmotely 1% in. to diameter, 2% to. on center*. Height Iil One Column Sq Ft Biuh 15 18 20 1% 360 22 23 IK 400 28 2 480 32 2H 600 38 3 720 45 Two Column Sq Ft Btufa IH 360 2 480 2H 540 2K 560 2K 640 3% 800 4 960 5 1200 Three Column Sq Ft Blub 2% 540 3 720 m 900 4% 1080 5 1200 6 1440 Foot Column Five Column Six Column Sq FI Btob- Sq Ft Blub Sq Ft Btuh ' 13 16 . 18 20 22 , 26 ' 32 1 38 ' 45 3 . 720 4. 5 6% 8 10 9601200 1560 1920 . 2400 4K 7 10 1120 3 3K . 4%. 5 1680 2400 720 900 1080 1200 . * These nriats we besed on steam at IIS F and air at TO F. They apply only to trwtmHcd radiator* exposed la a nonsai manner, not to radiator* installed eukwio, pfll^ qx sbelsm. For Btu per boor >***"f* at other tnaperatsm.dmde table values by factor* (oosd Ln Table 7. be eo designed:that they will not impair the performance of the assembled eonvector. It is desirable that the cabinet or enclosure for the convector fit as snugly as possible, so that the air passing through cannot bypass the heating element. BASEBOARD UNITS Baseboard heat-distributing units^ are divided into three types: (1) radiant, (2) radiant-convector, and (3) finned- tube.1 - Radiant-type baseboard is made of cast iron or stceL This type of unit emits'a large portion of its heat output by radia tion.'Units are sometimes' suspended from the-ceiling in rooms having little or no available wall' space for floor mounted units. As the .convected heat obtained from these units when mounted at the ceiling is less than when they are mounted'at floor level, additional.length must be added as recommended by. the manufacturer, to allow- for the reduc tion. ,i ,\ ,Radiaiit-<moettor.typerbs^ebo&rd is also made, of cast iron.or steel. Tire units are provided with air openings at the top and bottom to permit circulation of room air over the wall side of the -unit. The wall side of the unit has ex-, tended surface to provide increased -heat' output. A large portion ,of the heat emitted' is .transferred by convection. This type of baseboard, having a greater output per.linear foot than, the radiant type, is particularly- adaptable where wall space is at a premium or the heat loss of the room is high. Finned-tube type baseboard has a finned-tube heating element;that,is concealed by'a long,.low sheet-metal enclo- Number of Tube* Catalog Sating Height per Section* SqFt Btah to. 1K 420 20 2 480 23 8 2% 560 26 3 720 32 3% 840 38 2% 540 20 2% 600 23 4 660 26 3% 840 32 4X 1020 38 2K 640 ' 20 3 720 23 5 3% 840 26 4H 1040 32 5 1200 38 3 . 720 20 3% 840 23 6 4 960 26 5 1200 32 6 1440 38 2% 600 14 ' 7 ' 3 720 17 m 880 20 Width fa. *K 8-8He 9-10% IE teg Height" to Tapping hv fa. 2% 4% 2% 4% 2% 4% 2% 4% 2% 4% 2% 4%. 2K 4% 2% 4% 2% 4% 2%W 2%2%* . 2H< 4% 4% 4% 4% 4% 2% . 2% ' 2% 2% 2% 4% . 4% 4% 4% 4% . 2)i 2% 2% 3 3 3 or 4% to iaxtalled ndtoton eipmd in ncctnxl meaner; not to mdtoton it_________ hind eneketpen grille*. or nndcT (behre*. For Bta per hour rating* at other tem perature*, divide table value* by Caeton foond in Table 7. b Maximum aeaembly 00 lections. lenph equal* number of lections time* ` Hi in. * Where creator than standard leg height* are required, this dimension shall be 0 in., except for 7-tob* aectiona, In Might* from 13 to 20 in., inclusive, (or which thia dimension shall be 4M in. Radiator* may b* furnished without iexs- * Far S-tube bcepitai-type radiation, this is 2 in. sure or cover. A major portion of the heat is transferred to the room by convection.' Th'e'output varies over a wide range, depending on the physical dimensions and the materials used. .When selecting this- type of baseboard, the d^ign^r should avoid using a unit with too high an output per linear foot. Baseboard performs best when units are so selected that they are installed along as much of .the exposed wall as possible. The basic advantage of the baseboard heat-distributing unit is'that its normal placement is along the cold walla and under areas where the greatest heat loss occurs. Other advantages claimed for the baseboard heat-distributing unit are: it is inconspicuous; it offers a minimum of interference with' furniture placement, and it distributes the heat, near the floor. This last characteristic reduces the floor-to-ceiling temperature gradient to about 2 to 4 F deg, and tends to produce uniform temperatures throughout the room. It makes baseboard heat-distributing units adaptable to basementlesa homes, where cold floors are prevalent.1 Heat loss calculations for baseboard heating systems are the same as those used for other types of heat-distributing Radiators/ Convectors, Baseboard and Finned-Tube Units 859 Table 3 .... Small-Tube Casf-iron Radiators Table 5 7... Heat Emission of Pipe Coils Placed Vertically on a Wad (Pipes Horizontal} Containing Steam at 215 F and Surrounded with Air at -70F Bte per Bnear foot of coO per boar (itof Baeor foot of pipe)________ Sue of Pipe ! in. IX in. IHfa. Single row.................... Two............................... Four............................... Eight............................. Ten................................ Twelve.......................... 132 252 440 567 651 732 812 162 312 545 702 796 907 1005 ' 185 343 616 . 793 . 907 1020 1135 units. The procedure for designing baseboard heating sys tems is given in I = B = R Installation Guide No. 800* Rat ings for baseboard heat-distributing units are expressed in Btuh per linear foot. FINNED-TUBE UNITS. A finned-tube' heat-distributing unit'is a room-air heater composed of a finned-tube element fabricated from metallic tube to which metallic fins have been bonded. It does not include a fin-tube type baseboard element provided with an enclosure for replacement of the conventional baseboard; Finned-tube units are available in several tube sices, either steel or copper (1 to 2 in. IPS or \ to li nominal copper) with various fin rims, spacings, and materials. The resistance to toe flow of steam or water in finned-tube elements is the same as that through' standard distribution piping of equal site. The finned-tube unit can be used with either steam or hot water systems. It has advantages for installation where it is desired to distribute the heat along the entire outside wall, and thereby prevent'down drafts along the walls in buildings such as schools, churches, hospitals, and factories. Normal placement of finned tube is along the walls'where the heat loss is greatest. If necessary, the units can be in stalled in two or three tiers along available wall space to meet the hating requirements. For hot water system instal lations where two or three tiers are required, a sinuous' water flow through the heaters is recommended, because a header connection with parallel flow may permit the water to short circuit along the path of least resistance. Finned-tube elements may be installed -bare in locations where human contact is unlikely; they may be protected by open-type grilles, fabricated of expanded or perforated metal, covering the top and front of the element, or they may be TTicfttlloH in a variety of designs of covers or enclosures. A cover is a fabricated shield having at least a portion of the front skirt made of solid material. It can be mounted on the finned-tube element so that there is clearance be tween the wall and toe cover, and toe rear of toe finned-tube element is not completely enclosed. A cover may have a top, front, or inclined outlet. An enclosure is a shield of solid material installed so that the finned-tube element is completely enclosed at both front and rear. An enclosure may have an integral back or may be installed tightly against the wall so that the wall itself forms the back. An enclosure may have a top, front, of inclined outlet. A' multiplicity of enclosures have been developed, in co operation with architects and designers, to meet the require ments of modem building design. The wide variety of finnedtube elements (tube size and material, fin size, spacing, and material, and multiple tier installation), together with the Table A .... Cast-Iron Wall Radiators . Approximate Pfaaenwon* Indies Heat Output* Height 13% 13% 22 13% 29 Length or Width Thidcnen SqFt 16% . . 22 13% 29 13% .3 - 3. 3 3 3 6% . 8 .- 8 11 11 Btuh 1560 1920 1920 2610 2840 ' to faetalled radiator* opened in nocmal manner, net to radiator* to hind Mxdoeaito, grilka, or ander shelve*. Foe Bta per boar rating* at pentane divide table vetaee by teetan foand io Table 7.