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installation flat wallpipes are used to convey the warm air to second and third floorrooms, whereas round pipes with easy bends are run to first floorrooms. At any rate, these are the actual ratios we find in practice,and in order to be conservative we must reckon with them. The curves plotted as above are figured on the basis of air enteringthe heater chamber at zero, 10 degrees, etc., up to 70 degrees, inorder to fit all conditions between the two limits of outside air METHODS APPLIED TO THE DESIGN OF WARM AIR HEATING SYSTEMS 391 supply and indoor re-circulation, and are designated 1, or 2 and 3,according as they refer to first, or second and third floors. In order to apply these curves to any effective flue height, as wellas to the assumed thirty-five feet, the sloping lines in the upperrighthand corner of the chart were drawn. It can be seen fromformula (1) that the quantity of air delivered is proportional to thesquare root of the height. Therefore, in order to find the value of

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BTUs. Chart I 392 METHODS APPLIED TO THE DESIGN OF WARM AIR HEATING SYSTEMS Q for an effective flue height of five feet, it will be necessary tomultiply the value for thirty-live feet by i6 or .379. This is a 35straight line relation, and the line marked h = 5 feet is plotted bymaking the abscissa of any point equal to .379 times the ordinate.The lines for 10, 15, 20, 25 and 30 feet are plotted in the samemanner, the line marked h = 35 feet standing at an angle of 45degrees, as its ordinate is equal to its abscissa at every point. This gives us along the right-hand half of the horizontal axis alittle above the center of the chart, the^ value of Q for any height, andfor a pipe with a cross-sectional area of one square foot. To get thevalue of Q for any value of h and a pipe of any cross-sectional area,we use the sloping lines in the lower right-hand corner of the chart.It can be seen from formula (1) that the value of Q is proportionalto the value of A, and consequently, to the value o

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2009_09_30 Wallpipe (4) by Beth Burdick

2009_09_30 Wallpipe (3) by Beth Burdick

wallpipe by Bill Cameron

Bathroom Pipes by CORGI HomePlan

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Wallpipes by Stuart Crawford

wallpipe.jpg by Dan Au

wallpipe by dmcooper78

Wallpipe by Eduardo TOCA

wallpipes by dakegra

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Image from page 115 of "Heating and Ventilating Magazine" (1911) by Internet Archive Book Images

Identifier: heatingventilati09newyuoft

Title: Heating and Ventilating Magazine

Year: 1911 (1910s)

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Publisher: New York

Contributing Library: Gerstein - University of Toronto

Digitizing Sponsor: MSN

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each 5 ft., or part there-of, of length in excess of 15 ft. (orwhen odd ^-in. sizes of pipe are notused, add i in. to diameter of pipe foreach 10 ft. or part thereof, of length,in excess of 15 ft.) ; and in such acase the riser must be increased incapacity to equal the capacity of thecellar or basement pipe. An offset inthe riser pipe is equivalent to an addi- THE HEATING AND VENTILATING MAGAZINE 13 tion of the length of the cellar pipe andshould be counted in when measuringthe total length of the cellar pipe. Rule 4.—All warm air pipes incellar or basement must be coveredwith good non-conducting pipe cover-ing. Rule 5.—All warm air risers shouldbe carried up in inside partitions, Rule 6.—A separate compartmentshould be made in the crown of thefurnace or bonnet of the furnace foreach extra long or tortuous warm airpipe, thus insuring a positive supplyof warm air to that pipe. Rule 7.—The furnace must bedouble cased, or the casing must belined inside or must be covered outside

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TYPICAL LAYOUT OF WARM AIR FURNACE HEATING SYSTEM, FOR LARGE COUNTRYRESIDENCE, ACCORDING TO FEDERAL SYSTEM OF HEATING AND VENTILATION wherever possible, and should bedouble wall pipe, or should be singlepipe installed according to the fire-proofing method as described in theLeagues handbook. If double wallpipe is used, the capacity should notbe reduced. If cases arise where it isabsolutely necessary to carry up warmair risers in outer walls, such risersmust be so thoroughly protected withcovering as to be completely insulatedfrom the cooling effect of the outsidetemperature. with a good non-conducting materialcovering. Rule 8.—Each warm air pipe, ex-cept one, should be provided with atight disc damper. Rule 9.—The furnace must beattached to a chimney flue of correctconstruction; one which will furnishsufficient draft to insure a good com-bustion of the fuel. Rule 10.—The fresh air supply tothe furnace must be adequate. Additional directions are given for 14 THE HEATING AND VENTI

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Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.

Octocorallia colony by Kelli Scott

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