Sanitary, Heating and Ventilation Engineering: A General Reference Work, Volume 3American technical Society, 1919 - Heating |
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Sanitary, Heating and Ventilation Engineering: A General Reference ..., Volume 1 American Technical Society No preview available - 2016 |
Common terms and phrases
air-valves arc struck boiler bottom building carbonic acid cast-iron center line circulation coils cold-air cone cubic feet cubic foot curve cylinder describe the arc diameter direct radiation discharge divide draw a line draw lines drop ducts efficiency elbow eleva engine exhaust steam expansion tank feet of air feet per minute floor flow flues frustum furnace heat loss heater heating surface heating system height horizontal line hot water hot-water inches indirect inlet limewater line A B lines drawn lines intersecting live steam metal method miter line ogee outlet place the stretchout pressure prism pump radiating surface radii radius radius equal revolutions per minute right angles riser shown by similar shown in Fig side elevation similar numbers spaces square feet square foot supply Table tank temperature true length true section usually valve velocity vent ventilation vertical lines walls warm air water-line
Popular passages
Page 308 - Take the various lengths from 2 to 3 to 4 to 5 to 6 to 7 to 8 to A in plan and place them as shown by similar numbers on the horizontal line ab (Fig.
Page 1 - ... editors have freely consulted the standard technical literature of America and Europe in the preparation of these volumes. They desire to express their indebtedness particularly to the following eminent authorities whose well-known works should be in the library of everyone connected with building.
Page 37 - ... most readily through pipes leading toward the sheltered side of the house and to the upper rooms. Therefore pipes leading toward the north or west, or to rooms on the first floor, should be favored in regard to length and size. The furnace should be placed somewhat to the north or west of the center of the house, or toward the points of compass from which the prevailing winds blow.
Page 24 - ... layers, and the difference between the inside and outside temperatures. ' The exact amount of heat lost in this way is very difficult to determine theoretically, hence we depend principally on the results of experiments. Loss by Air-Leakage. The leakage of air from a room varies from one to two or more changes of the entire contents per hour, depending upon the construction, opening of doors, etc. It is commo'n practice to allow for one change -per hour in well-constructed buildings where two...
Page 117 - Fig. 100 may be carried back, if desired, into the supply drop, as shown by the dotted lines. Combination Systems. Sometimes the boiler and piping are arranged for either steam or hot water, since the demand for a higher or lower temperature of the radiators might change. The object...
Page 110 - We have seen that an average cast-iron radiator gives off about 1.7 BTU per hour per square foot of surface per degree difference in temperature between the radiator and the surrounding air, when working under ordinary conditions; and this holds true whether it is filled with steam or water.
Page 61 - It is readily seen that the return water, in order to reach the boiler, must flow through the trap, which raises the water-line or seal to the level shown by the dotted line. The balance pipe is to equalize the pressure above and below the water in the trap, and prevent siphonic action, which would tend to drain the water out of the return mains after a flow was once started. The balance pipe, when possible, should be 15 or 20 feet in length, with a throttle-valve placed near its connection with...
Page 64 - the condensation drains back through the same pipes, and is carried along with the flow of steam to the extreme end of the main, where it is returned to the boiler. The main is made large, and of the same size throughout its entire length. It must be given a good pitch to insure satisfactory results.
Page 58 - X 225 = 240; that is the efficiency varies directly as the difference in temperature between the steam and the air of the room. It is not customary to consider this unless the steam pressure should be raised to 10 or 15 pounds or the temperature of the rooms changed 15 or 20 degrees from the normal. From the above it is easy to compute the size of radiator for any given room. First compute the heat loss per hour by...
Page 72 - We have seen that the higher the initial pressure with a given drop, the greater will be the quantity of steam discharged ; therefore a .smaller pipe will be required to deliver 80 pounds of steam at 40 pounds than at 3 pounds initial pressure From Table XV, we find that a given pipe will discharge 1 .7 times as much steam per minute with a pressure of 40 pounds and a drop of 3 pounds, as it would with a pressure of 3 pounds, dropping to zero. From this it is evident that if we divide 80 by 1 .7...