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Power, Heating and Ventilation Volume 2; Heating and Ventilating Plants

Power, Heating and Ventilation Volume 2; Heating and Ventilating Plants


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About the Book

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. 1914 Excerpt: ... into a main return leading to a vented receiver in the boiler room. The trap should be provided with a by-pass and drain connection, as shown. The flow main supplying the radiators is taken from the top of the tank and the return is brought into the bottom at the opposite end, as shown, with provision for draining the tank and entire heating system to the sewer, if desired. An expansion pipe, without valve, connects the heating tank with the expansion tank as indicated. Assuming the average temperature of the water passing through the heater as 170, each square foot of coil surface will supply about 40 square feet of direct radiation for a steam pressure of 5 pounds; 60 square feet for a pressure of 10 pounds; and 60 square feet for a pressure of 20 pounds. By using a heater in which the water passes through tubes surrounded by steam the above ratios may be increased from 20 to 30 per cent depending upon the velocity of flow. Calculation of Pipe Sizes. It has already been shown that the velocity of flow through the pipes of a hot-water heating system is dependent upon the difference in temperature of the water in the supply and return mains, and upon the height of the radiation above the boiler. If these quantities are known, the "pressure head" for producing flow may be found by the following equation, from Chapter I, H--T X h X 0.000367, in which H = pressure head, in feet. T = difference in temperature between supply and return. h = height of radiation above the boiler, in feet. Table XXXIV. gives the pressure or friction heads required to Table XXXIV. Pressure Heads For Flow Through Hot-water Pipes. Gallons per minute 5 10 15 20 30 40 GO 60 80 100 120 140 160 180 200 280 800 850400 600 produce a given flow in gallons per minute through pipes ...


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Product Details
  • ISBN-13: 9781236437204
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 74
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1236437209
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 150 gr


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