The kiln drying of lumber; a practical and theoretical treatise . FiG. 33.—Cross section of kiln. Inclined piling is excellent where the circulation ischiefly in the vertical direction and transverse of the kiln. C, condensers; H, Heaters. creased circulation. It short-circuited the piles anddid not pass through them satisfactorily on accountof the baffling effect of the flat piled boards. Inclined piling, on the other hand, as indicated inFigure 33, or edge-piling, as in Figure 34, gives verysatisfactory results with the vertical transverse methodof circulation. It will be observed that in Fi
The kiln drying of lumber; a practical and theoretical treatise . FiG. 33.—Cross section of kiln. Inclined piling is excellent where the circulation ischiefly in the vertical direction and transverse of the kiln. C, condensers; H, Heaters. creased circulation. It short-circuited the piles anddid not pass through them satisfactorily on accountof the baffling effect of the flat piled boards. Inclined piling, on the other hand, as indicated inFigure 33, or edge-piling, as in Figure 34, gives verysatisfactory results with the vertical transverse methodof circulation. It will be observed that in Figure 33,which represents a cross section of a condensing kiln. 160 THE KILN DRYING OF LUMBER the lumber is so arranged as to take advantage of thenatural tendency of the air to descend in passingthrough the pile. This is in fact a better arrange-ment than the edge-piling shown in Figure 34, withheaters beneath the lumber and condensers on the sides,because the forced air movement is contrary to and isopposed by the natural tendency in Figure 34, and local. Fig. 34.—Cross section of kiln. Edge piling is effective where circulation is verticaland transverse of the kiln. H, heaters; C, condensers. eddy currents are apt to occur, causing stagnation inplaces and irregular drying. The Best Arrangement.—The best arrangement ofall is that shown in Figure 35 with edge-piled lumber,in which the condensers are placed beneath the pileand the heaters on the sides. This takes the fullestadvantage of the principle of descending air and offersthe least resistance to its motion. It will give muchmore uniform drying than the method illustrated inFigure 34, for there is no tendency here for the forma- THE CIRCULATION AND METHOD OF PILING 161 tion of eddy currents or stagnation of the air at anypoint. Both factors are working in the same direction,instead of being opposed to each other as is the casein Figure 34. By way of caution to those who contemplate erect-ing new kilns, it should not b
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Keywords: ., bookcentury1900, bookdecade1910, bookidkilndry, booksubjectlumber
