Carpentry and Contracting: A Practical Reference Work on Carpentry, Building Superintendence, Etc, Том 4American technical society, 1919 |
З цієї книги
Результати 1-5 із 67
Сторінка 24
... Square Foot of Surface per Hour— Southern Exposure DIFFERENCE BETWEEN INSIDE AND OUT- SIDE TEMPERATURES MATERIAL 10 ° 8 - in . Brick Wall 12 - in . Brick Wall 16 - in . Brick Wall 20 - in . Brick Wall 24 - in . Brick Wall 28 - in ...
... Square Foot of Surface per Hour— Southern Exposure DIFFERENCE BETWEEN INSIDE AND OUT- SIDE TEMPERATURES MATERIAL 10 ° 8 - in . Brick Wall 12 - in . Brick Wall 16 - in . Brick Wall 20 - in . Brick Wall 24 - in . Brick Wall 28 - in ...
Сторінка 25
... square foot of surface per hour , for varying differences in inside and outside temperatures . In computing the heat ... square feet and a glass surface of 50 square feet , when the outside temperature is zero ? The wall is of brick , 16 ...
... square foot of surface per hour , for varying differences in inside and outside temperatures . In computing the heat ... square feet and a glass surface of 50 square feet , when the outside temperature is zero ? The wall is of brick , 16 ...
Сторінка 27
... square foot of exposed surface consists one - sixth of glass and five - sixths of wall , and the heat loss for 70 ° difference in temperature would be as follows : 5 Wall X 19 = 15.8 6 1 Glass X 85 = 14.1 6 29.9 Increasing this 20 per ...
... square foot of exposed surface consists one - sixth of glass and five - sixths of wall , and the heat loss for 70 ° difference in temperature would be as follows : 5 Wall X 19 = 15.8 6 1 Glass X 85 = 14.1 6 29.9 Increasing this 20 per ...
Сторінка 28
... foot of air 55 degrees at average temperatures and pressures , or will raise 55 cubic feet 1 degree , so that the heat required for the ventilation of any room can be found by the following ... square feet , 28 18 HEATING AND VENTILATION.
... foot of air 55 degrees at average temperatures and pressures , or will raise 55 cubic feet 1 degree , so that the heat required for the ventilation of any room can be found by the following ... square feet , 28 18 HEATING AND VENTILATION.
Сторінка 35
... square foot of grate per hour must be main- tained . One pound of good anthracite coal will give off about 13,000 B. T. U. , and a good furnace should utilize 70 per cent of this heat . The efficiency of an ordinary furnace is often ...
... square foot of grate per hour must be main- tained . One pound of good anthracite coal will give off about 13,000 B. T. U. , and a good furnace should utilize 70 per cent of this heat . The efficiency of an ordinary furnace is often ...
Інші видання - Показати все
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...