Engineering Work in Public Buildings; Power, Lighting, Heating, Ventilation, Water Supply ... (Paperback)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ...of the manifold calorifier system with steam connections to a central boiler-house. A complete arterial and venous circulating system in mains and branches is an extension of the fundamental idea, and has a practical gain over the simple one of forced main circulation and thermosyphonage in branches. Such a system represents a complete exposition of "twopipe" hot water fitting. Its advantages are positive flow through all radiators. The heating engineer can generally arrange for final satisfactory results in the fitting-up of details in an ordinary gravity hot-water installation, by adopting twoand one-pipe and overhead principles according to the exigencies of each special portion of the system. Although the "one-pipe" system looks unscientific and crude, it is yet based on sound fundamentals, the most prominent of which is the fact that a section of a quasi-horizontal pipe conveying hot water in a steadyflowing stream exhibits the phenomenon, and quite naturally, of hot water at the upper part and cooler water at the lower. The object of the simplest forced hot-water system is to provide flow and return mains, with such effective movement in the pipes that a high temperature may be present at considerable distances from the calorifiers. It should, however, be noticed that this high tension system of hot-water mains again brings about an equivalent to saving in "copper," for to attempt anything on the same scale with thermo-syphonage would need great diameter of mains and a great body of water in the main system. A vigorous flow will need a less diameter of pipe, much as the high voltage reduces necessity for cross-section of cable; and it seems indicated practically that a relatively small main--not...