Minutes of Proceedings Volume 143 (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. 1901 Excerpt: ...by an addition of 34 to all losses by radiation from the building and by incoming leakage. The climatic extreme is usually attained once or twice during the month of January or early in February, when a temperature of 5 to 7 F. may be reached, accompanied by a wind of storm velocity. On very rare occasions the temperature has fallen to zero. A basis of zero temperature, and a wind-velocity of 60 miles per hour may therefore be taken to represent the most extreme conditions. For such a wind-velocity the coefficient, when applied to glass, should be increased from the German basis of 1 03, by an addition of at least 23 per cent, to provide for loss of heat or introduction of cold air by inward leakage around the window-frames. In New York the windows of office-buildings are fairly well fitted, and are usually weather-stripped after the first season; but as the first season forms the basis of test, allow ance should be made for the introduction of cold air through leakage. For very large or unusually lofty rooms with disproportionately small exposed surface, some allowance has to be made for dissipation of heat from the rear or from the upper part of the room, and in such a case the ratio of the total cubic contents to the total heating surface, expressed in corresponding units, should not be less than 80 to 1. A good ratio is found by dealing with 20 feet of the exposed end of the room by the formulas, and a relation of 1 square foot of surface to each 100 cubic feet of the rear part of the room. The methods of supplying steam to, and affording egress for condensed steam from, sectional radiators are known as the " onepipe," "two-pipe" and "three-pipe" systems. In the first, a single pipe supplies steam and is made large e...