Hot Water Heating and Fitting (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. 1908 Excerpt: ...and other fittings are once fully appreciated, the results in.hot-water circulation will leave very little more to be desired, as by a careful study of the laws that underlie the subject an engineer can predict be'forehand with assurance under what loss of temperature the water of an apparatus will circulate. Branch Circuits. All that can be said of a simple circuit applies also to the branch circuits from a large main. The one leads directly from the head of the boiler, the other from the large mains; and when the latter is of ample size and a proper circulation is maintained therein, branches from it will give results equally as good as with those taken directly from the boiler. In fact, in long, low buildings better results can be obtained, and at a less first cost, by carrying a large trunk main through the centre of the building and branching it properly, than can be obtained by a number of long simple ciicuits that are of necessity of a comparatively small diameter, and so give a very much greater resistance for the amount of water passed than that of a single large main. I may repeat again that single parallel circuits carried from the head of a boiler to the remote divisions of a building will only be used by those who are not skilled in proportioning and branching large mains into proper subdivisions. It is the practical means used, however, for preventing complete failure and securing reasonably equable temperatures, as the hot water from the boilers is so divided at the start that each circuit takes its share, the amount passing in any direction being regulated by the diameter of the pipe, its length and bends, and the height of the end of the circuit above the boiler. I do not wish to be understood, however, as saying that the simple circuit sys...