District Heating; A Brief Exposition of the Development of District Heating and Its Position Among Public Utilities - Softcover

Inhaltsangabe

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. 1915 Excerpt: ...W=AxdxVxK (1) Then, Iff If) W=AXdsX62.o4XKA lbs. per sec. as =A X3600X62.04XKV(Hw. ds) lbs. per hr. = 223344XA XKV(HwXds) (13) Formula (13) is the equation used for computing the charts, furnished with the meter. These charts, as will be seen, are mounted upon a cylinder placed at the side of the water glass, and are graduated to read in pounds of steam per hour directly. The Republic Steam Flow Meter. This meter, Fig. 38, is the outgrowth of the Gebhardt Indicating water-column meter. The first attempt at improvement--with the idea of making the meter a recording device--consisted in the application of the water column of a Pitot-tube in contact with a resistance coil. The vertical movement of the water column, proportional to the velocity of steam causes a varying amount of current to flow through the coil and registers through a recording ammeter and integrating watt-meter. The readings from these instruments when multiplied by proper experimental constants for different pressures give the quantity of steam flawing. Unfortunately, difficulty was encountered with the water column, it being found that impurities in the steam,--boiler compound and oils,--coated the coils and made correct results impossible. Finally, mercury was adopted with much better success, and by interposing an oil seal between the electric wires and the tubes, no water is permitted to interfere. (These instruments have not been on the market long enough to have proven their worth, but it appears they will be acceptable for commercial use.) Fig. 39 requires very little explanation. Each conductor in the set has a specific resistance which regulates the flow of current so as to register according to the square root of the height of the mercury column. The current for actuating the instr...

Die Inhaltsangabe kann sich auf eine andere Ausgabe dieses Titels beziehen.