Mechanics of the Household. E. S. Keene
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FORMS OF RADIATORS
Radiators are much the same in appearance for both steam and hot-water heating. They are hollow cast-iron columns so designed that they may be fastened together in units of any number of sections. The sections are made in size to present a definite number of square feet of outside surface that is spoken of as radiating surface. The amount of radiating surface in any radiator depends on its height and the contour of the cross-section. The radiator sections may be made in the form of a single column as Fig. 22 or they may be divided into two, three, four or more columns to increase their radiating surface.
The following table, taken from a manufacturer’s catalogue, shows the method of rating the heating capacity of a particular design. In the table, the first column gives the number of sections in the radiator, the second column states the length of the radiator in inches. The columns headed heating surface give the heights of the sections in inches and the amount of radiating surface in various radiators of different heights and numbers of sections. As an example: This table refers to the three-column radiators of Fig. 23. Such a radiator 32 inches high with 10 sections would contain 45 square feet of radiating surface and would be 25 inches in length.
| No. of sections | Length 2½ in. per section | Heating surface—square feet | |||||
| 45 in. high, 6 sq. ft. per sec. | 38 in. high, 5 sq. ft. per sec. | 32 in. high, 4½ sq. ft. per sec. | 26 in. high, 3¾ sq. ft. per sec. | 23 in. high, 3¼ sq. ft. per sec. | 20 in. high, 2¾ sq. ft. per sec. | ||
| 2 | 5 | 12 | 10 | 9 | 7½ | 6½ | 5½ |
| 3 | 7½ | 18 | 15 | 13½ | 11¼ | 9¾ | 8¼ |
| 4 | 10 | 24 | 20 | 18 | 15 | 13 | 11 |
| 5 | 12½ | 30 | 25 | 22½ | 18¾ | 16¼ | 13¾ |
| 6 | 15 | 36 | 30 | 27 | 22½ | 19½ | 16½ |
| 7 | 17½ | 42 | 35 | 31½ | 26¼ | 22¾ | 19¼ |
| 8 | 20 | 48 | 40 | 36 | 30 | 26 | 22 |
| 9 | 22½ | 54 | 45 | 40½ | 33¾ | 29¼ | 24¾ |
| 10 | 25 | 60 | 50 | 45 | 37½ | 32½ | 27½ |
| 11 | 27½ | 66 | 55 | 49½ | 41¼ | 35¾ | 30¼ |
| 12 | 30 | 72 | 60 | 54 | 45 | 39 | 33 |
| 13 | 32½ | 78 | 65 | 58½ | 48¾ | 42¼ | 35¾ |
| 14 | 35 | 84 | 70 | 63 | 52½ | 45½ | 38½ |
| 15 | 37½ | 90 | 75 | 67½ | 56¼ | 48¾ | 41¼ |
| 16 | 40 | 96 | 80 | 72 | 60 | 52 | 44 |
| 17 | 42½ | 102 | 85 | 76½ | 63¾ | 55¼ | 46¾ |
| 18 | 45 | 108 | 90 | 81 | 67½ | 58½ | 49½ |
| 19 | 47½ | 114 | 95 | 85½ | 71¼ | 61¾ | 52¼ |
| 20 | 50 | 120 | |||||