. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students . lso for air cooling under certain conditions. Principle of Operation.—^^The principle of operation is practi-cally the same in most of the standard machines and is illustratedin the following descriptions. The McCreery air purifying and cooling device is shown insection in Fig. 179. Air enters as indicated, and first passesthrough a tempering coil to raise it above the freezing point in 252 HEATING AND VENTILATING PLANTS winter weather; then through a double sheet of water discha
. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students . lso for air cooling under certain conditions. Principle of Operation.—^^The principle of operation is practi-cally the same in most of the standard machines and is illustratedin the following descriptions. The McCreery air purifying and cooling device is shown insection in Fig. 179. Air enters as indicated, and first passesthrough a tempering coil to raise it above the freezing point in 252 HEATING AND VENTILATING PLANTS winter weather; then through a double sheet of water dischargedfrom specially designed spray heads or nozzles, under a pressureof 5 to 10 pounds per square inch. Before leaving the spray chamber the air passes through an-other curtain of water as shown by the arrows. It is next drawnthrough a series of V-shaped baffles for removing the surplusmoisture, and then passes through a secondary or re-heater be-fore reaching the fan. The water is supplied to the sprayheads by means of a small centrifugal pump, either belted to thefan shaft or driven by an independent Fig. 179. McCreery Air Purifying and Cooliiig Device. The spray and the water which is removed by the baffle platesfalls into a tank at the bottom of the spray chamber and is usedover and over again. When it becomes too dirty to effectuallycleanse the air, it is drawn off and replaced by a fresh supply. Fig. 180 shows a plan and elevation of the Thomas is similar in principle to the one just described, except theair passes through a shallower spray of water, and its path issomewhat more direct. Form, of Spray.—It has been found by experience that sheetsof water in the form of rain are the most efficient for removingdust from the air, while a fine mist has a greater cooling effect. Certain washers make use of a combination of these sprays inthe standard machines and emplo) the latter, alone, where cool-ing is the principle object sought. Air Velocity Throu
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectventilation, bookyear
