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Sanitary, Heating and Ventilation Engineering Volume 3; A General Reference Work

Sanitary, Heating and Ventilation Engineering Volume 3; A General Reference Work


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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. 1918 Excerpt: ... computing the size of heater for any given building is the same as in the case of indirect heating. First obtain the B. T. U. required for ventilation, and to that add the heat loss through walls, etc.; and divide the result by the efficiency of the heater under the given conditions. Example. An audience hall is to be provided with 400,000 cubic feet of air per hour. The heat loss through walls, etc., is 250,000 B.T.U. per hour in zero weather. What will be the size of heater, and how many rows of pipe deep must it be, with 20 pounds steam pressure? 400,000 X 70 _ 509 090 B T Tj for ventilation 55 Therefore 250,000 + 509,090 = 759,090 B. T. U., total to be supplied. We must next find to what temperature the entering air must be raised in order to bring in the required amount of heat, so that the number of rows of pipe in the heater may be obtained and its corresponding efficiency determined. We have entering the room for purposes of ventilation, 400,000 cubic feet of air every hour, at a temperature of 70 degrees; and the problem now becomes: To what temperature must this air be raised to carry in 250,000 B. T. U. additional for warming? We have learned that 1 B. T. U. will raise 55 cubic feet of air 1 degree. Then 250,000 B. T. U. will raise 250,000 X 55 cubic feet of air 1 degree. 250,000 X 55 = 400,000 The air in this case must be raised to 70 + 34 = 104 degrees, to provide for both ventilation and warming. Referring to Table XXX, we find that a heater 12 pipes deep will be required, and that the corresponding efficiency of the heater will be 1,650 B. T. U. Then = 460 square feet of surface required. Efficiency of Cast-Iron Heaters. Heaters made up of indirect pin radiators of the usual depth, have an efficiency of at least 1,500 B. T. U., with steam at...


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Product Details
  • ISBN-13: 9781130068672
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 88
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1130068676
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 172 gr

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