Cyclopedia of Heating, Plumbing and Sanitation: Heating and ventilation. Steam and hot-water fitting. Electric wiringAmerican technical society, 1909 |
Загальні терміни та фрази
air-valves alternating current Angle Valve arrangement basement boiler branch circuit building cable carbonic acid cast-iron cent circulation coil cold cold-air computing condensation conduit cross-arms cubic feet damper diameter direct radiation discharge drop ducts efficiency Electric engine entering exhaust steam expansion tank feeders feet of air feet per minute floor flow furnace give given heat loss heat units heater heating surface heating system hot water hot-water heating inches indirect inlet installed insulation iron lamps length limewater live steam National Electric Code necessary neutral conductor opening outlet outlet-box placed poles practice pump radiating surface reactance revolutions per minute risers schoolhouse sections shown in Fig shows sizes skin effect square feet square foot steam heating supply Table temperature three-wire system trap tube two-wire two-wire circuit usually valve velocity voltage voltmeter volts walls warm air zero
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Сторінка 233 - ... being the amount of heat necessary to raise the temperature of 1 pound of water 1 degree Fahrenheit.
Сторінка 75 - XIX have been prepared for velocities of 10 and 15 feet per second. The sizes given in Table XIX have been found sufficient in most cases; but the larger sizes, based on a flow of 10 feet per second, give greater safety and should be more generally used. The size of the largest riser should usually be limited to 2$ inches in school and dwelling-house work, unless it is a special pipe carried up in a concealed position: If the length of riser is short between the lowest radiator and the main, a higher...
Сторінка 37 - 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.
Сторінка 17 - It is the active element in the chemical process of combustion and also in the somewhat similar process which takes place in the respiration of human beings. Taken into the lungs, it acts upon the excess of carbon in the blood, and possibly upon other ingredient?, forming chemical compounds which are thrown off in the act of respiration or breathing.
Сторінка 308 - Rigid supporting requires under ordinary conditions, where wiring over flat surfaces, supports at least every four and one-half feet. If the wires are liable to be disturbed, the distance between supports should be shortened. In buildings of mill construction, mains of No.
Сторінка 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...
Сторінка 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...
Сторінка 16 - Sometimes a by-pass damper is attached, so that part of the air will pass through the heater and part around or over it; in this way the proportions of cold and heated air may be so adjusted as to give the desired temperature to the air entering the rooms. These forms of regulation are common where a blower is used for warming a single room, as in the case of a church or hall ; but where several rooms are warmed, as in a schoolhouse. it is customary to use the main or primary heater at the blower...
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 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...