Carpentry and Contracting: A Practical Reference Work on Carpentry, Building Superintendence, Etc, Том 4American technical society, 1919 |
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Сторінка 13
... become a medium for conveying heat to offset that lost by leakage and conduction through walls and windows . A system for indirect steam may be so designed that it will supply a greater quantity of fresh air than the ordinary form of ...
... become a medium for conveying heat to offset that lost by leakage and conduction through walls and windows . A system for indirect steam may be so designed that it will supply a greater quantity of fresh air than the ordinary form of ...
Сторінка 14
... becomes heated before entering the room . A switch damper is placed in the casing at the base of the radiator , so ... become overheated , and more or less heat wasted through open doors and windows . A comparison of the relative costs ...
... becomes heated before entering the room . A switch damper is placed in the casing at the base of the radiator , so ... become overheated , and more or less heat wasted through open doors and windows . A comparison of the relative costs ...
Сторінка 19
... becomes milky . The size of the cylinder and the quantity of limewater are so propor- tioned that a change in color at the first , second , third , etc. , cylinder full of air indicates different proportions of carbonic acid . This test ...
... becomes milky . The size of the cylinder and the quantity of limewater are so propor- tioned that a change in color at the first , second , third , etc. , cylinder full of air indicates different proportions of carbonic acid . This test ...
Сторінка 22
... becomes filled with pure air without sensible currents or drafts . The cooler air sinks to the bottom of the room ... become chilled and the air - flow through it will become sluggish . In theaters and churches which are closely packed ...
... becomes filled with pure air without sensible currents or drafts . The cooler air sinks to the bottom of the room ... become chilled and the air - flow through it will become sluggish . In theaters and churches which are closely packed ...
Сторінка 29
... becomes heated . It then rises through the warm - air pipes at the top of the casing , and is discharged through the registers into the rooms above . As the warm air is taken from the top of the furnace , cold air flows in through the ...
... becomes heated . It then rises through the warm - air pipes at the top of the casing , and is discharged through the registers into the rooms above . As the warm air is taken from the top of the furnace , cold air flows in through the ...
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Carpentry and Contracting: A Practical Reference Work on Carpentry ..., Том 2 American Technical Society Попередній перегляд недоступний - 2016 |
Загальні терміни та фрази
air-valves arrangement ball cock basement boiler bolt bottom bowl building butts carbonic acid carried cast-iron check valve circulation closet cock coil cold cold-air compute condensation connected damper diameter direct radiation discharge door drain efficiency escutcheon expansion tank faucet fittings fixtures floor flow flue flush friction furnace gallons give grate hard water hardware heat loss heat units heater heating surface heating system hinge horizontal hot water hot-water hour inches indirect inlet installed iron joint knob latch lavatory limewater live steam lock method Mineral Wool necessary ordinary outlet placed porcelain pump quantity radiating surface risers sash screw seal sections sewer shown in Fig sink siphon soft water solder square feet square foot steam heating supply Table temperature trap usually valve velocity vent ventilation vertical vitrified clay pipe wall warm air water closets weight
Популярні уривки
Сторінка 2 - BAKER Professor of Civil Engineering, University of Illinois, Author of " A Treatise on Masonry Construction.
Сторінка 159 - British thermal unit is the amount of heat required to raise the temperature of 1 pound of water 1 degree Fahrenheit.
Сторінка 57 - BTU The temperature of steam at 3 pounds' pressure is 220 degrees, and 220 — 70 = 150, which may be taken as the average difference between the temperature of the steam and the air of the room, in ordinary lowpressure work. Taking the above results, we have 150 X 1 .7 = 255 BTU as the efficiency of an average cast-iron or pipe radiator. This, for convenient use, may be taken as 250. A circulation coil made up of pipes from 1 to 2 inches in diameter, will easily give off 300 BTU under the same conditions...
Сторінка 35 - For the best types of househeating boilers, we may assume a combustion of 5 pounds of coal per square foot of grate per hour, and an average efficiency of 60 per cent, which corresponds to 8,000 BTU per pound of coal, available for useful work. In the case of...
Сторінка 120 - The ordinary pet-cock air-valve is the most reliable for hot-water radiators, although there are several forms of automatic valves which are claimed to give satisfaction. One of these is shown in Fig. 104. This is similar in construction to a steam trap. As air collects in the chamber, and the water-line is lowered, the float drops, and in so doing opens a small valve at the top of the chamber, which allows the air to escape. As the water flows in to take its place, the float is forced upward and...
Сторінка 55 - The pipes are eitherconnected in pairs at the top by return bends, or each separate tube has a thin metal diaphragm passing up the center nearly to the top. It is necessary that a loop be formed, else a "dead end
Сторінка 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...
Сторінка 68 - Return. between the riser and radiator is above the floor; and the third, when the radiator has to be set close in the corner of a room and there is not space for the usual connection. A globe valve should never be used in a horizontal steam supply or dry return. The reason for this is plainly shown in Fig.
Сторінка 110 - Connections. temperature of 170 degrees in the radiators. Variations may be made, however, to suit the existing conditions of outside temperature. We have seen that an average...
Сторінка 125 - In schoolhouse and hospital work, where larger volumes of air are warmed to lower temperatures, an efficiency as high as 500 BTU may be allowed for radiators of good form. Flues and Casings. For cleanliness, as well as for obtaining the best results, indirect stacks should be hung at one side of the register or flue receiving the warm air, and the cold-air duct should enter beneath the heater at the other side. A space of at least 10 inches, and preferably 12, should be allowed for the warm air above...