Cold Storage, Heating and Ventilating on Board Ship (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ... 0.574; 6-inch, 0.523 unit. These figures are the values of A. For radiators the problem is rather more complicated, in the matter of convection. The French savants referred to have threshed the matter out, and have produced some formulae applicable to all cases, as a result of their experiments, and the formulae are apparently pretty correct in practice. They are very complicated, however, and it will be perhaps sufficient if it be mentioned that heat liberated by convection from a sphere is considerably more for any given surface, and in a given time, than from a cylinder; and again the heat liberated from a horizontal cylinder, of a given diameter, is usually more than from a vertical cylinder of the same diameter. The rates for horizontal cylinders given above were taken from Mr. Box's book. The rate with vertical pipes does not appear to have been measured, but Professor Carpenter and others have made some very interesting experiments upon radiators of different forms, heated by steam and hot water. The radiators experimented on were of various forms, among them those shown in the drawings; also some consisting merely of iron pipes of different diameters and different lengths, arranged some horizontally and some vertically; also pipes and other arrangements with ribs cast on them, brass tubes plain and corrugated, and other forms. The net result of the experiments conducted by Carpenter, and by others whose work he quotes, appears to be a liberation of heat, the combined effect of radiation and convection, ranging from i,25 B. T. U. per square foot of surface per I degree F. difference of temperature between the heated surface and the surrounding air, per hour, up to 2.89 B. T. U. The best results are obtained with pipes or radiators of...