The kiln drying of lumber; a practical and theoretical treatise . Fig. 46 shows diagrammatically thearrangement of the spray water and condenser regulat-ing apparatus. Construction.—^Any kind of building constructionmay be used, but it should be water- and moisture-proof. All cement work except the foundations shouldbe waterproofed. This may be accomplished by using5 per cent, solution of alum and 8 per cent, of soap inthe water used for mixing the concrete, or the wallsmay be thoroughly coated with high temperature as-phaltum varnish. In cold climates either standard wooden studdingconstructi
The kiln drying of lumber; a practical and theoretical treatise . Fig. 46 shows diagrammatically thearrangement of the spray water and condenser regulat-ing apparatus. Construction.—^Any kind of building constructionmay be used, but it should be water- and moisture-proof. All cement work except the foundations shouldbe waterproofed. This may be accomplished by using5 per cent, solution of alum and 8 per cent, of soap inthe water used for mixing the concrete, or the wallsmay be thoroughly coated with high temperature as-phaltum varnish. In cold climates either standard wooden studdingconstruction or hollow tile is preferable on account ofinsulation. A certain amount of radiation from the IMPROVED WATER SPRAY DRY KILN 197 side walls is desirable, since it increases the efficiencyof the condensers and the sprays—the heat given to thewalls does not need to be removed by the not use galvanized pipes or metal in a dry kiln,as the fumes rapidly decompose the coating. Use plainwrought iron pipes and paint them with a good high ^ 4/un 3 » Gfi/tOUir/AG IV/f/W/KX. jr/yf/iirf^£ A^D ATTACM/7£/yr TOOfi£ INCH FEBD PIPE. /CC£P iV£l,L rVll. OF iVAT£/i Fig. 46,—Diagrammatic sketch of water spray and condenser system. temperature asphaltum varnish or black baking —The operation is very simple. Theheated air rises in the flue between the two piles oflumber. As it comes in contact with the piles, parts ofit are cooled and forced to pass outwardly through thepiles to the spray chambers. Here the velocity of thedescending column of air is greatly augmented by thesprays. It then passes out through the baffle plates 198 THE KILN DRYING OF LUMBER into the space inunediately beneath the heaters. Hereit is in a saturated condition and its temperature istherefore manifestly the dewpoint of the air after it be-comes heated in passing through the steam pipes. Thismay, therefore, be termed the dewpoint method ofhumidity control, since thi
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Keywords: ., bookcentury1900, bookdecade1910, bookidkilndry, booksubjectlumber
