. Bulletin of the Department of Agriculture. Agriculture; Agriculture -- United States. HUMIDITY-EEGULATED AND RECIRCULATING DRY KILN. 11 spray. This spray completely saturates the air in the flue B at what- ever predetermined temperature is required. The baffle plates D D are to separate all entrained particles of water from the air, so that it is delivered to the heaters in a saturated condition at the required temperature. This temperature is, therefore, the dew point of the air w^hen heated above, and the method of humidity control may therefore be called the dew-point method. It is a
. Bulletin of the Department of Agriculture. Agriculture; Agriculture -- United States. HUMIDITY-EEGULATED AND RECIRCULATING DRY KILN. 11 spray. This spray completely saturates the air in the flue B at what- ever predetermined temperature is required. The baffle plates D D are to separate all entrained particles of water from the air, so that it is delivered to the heaters in a saturated condition at the required temperature. This temperature is, therefore, the dew point of the air w^hen heated above, and the method of humidity control may therefore be called the dew-point method. It is a very simple matter by means of the humidity diagram,^ or by a hydrodeik, to determine what dew-point temperature is needed for any desired humidity above the Fig. 1.—Diagrammatic section of improved dry kiln with spray cliambers in center. Double-truck form. Besides regulating the humidity the spray F also acts as an ejector and forces a circulation of air through the flue B. The heating sys- tem H is concentrated near the outer walls, so as to heat the rising column of air. The temperature within the drying chamber is con- trolled by means of any suitable thermostat, actuating a valve on the main steam line. The lumber is piled in such a way that the stickers slope downward toward the center. M is an auxiliary steam spray pointing downward for use at very high temperatures. C is a gutter to catch the precipitation and ' Forest Service Bulletin 104, " Principles of Drying Lumber at Atmospheric Pressure and Humidity Diagram," Superintendent of Documents, Government Printing Office, Washington, D. C. Price, 5 cents. Lumber World Review, Feb. 10. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. ,
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