Principles of Drying Lumber at Atmospheric Pressure and Humidity Diagram (Classic Reprint) - Hardcover

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Excerpt from Principles of Drying Lumber at Atmospheric Pressure and Humidity Diagram

The rate of evaporation may best be controlled by controlling the amount of vapor present in the air (relative humidity); it Should not be controlled by reducing the air circulation, since a large circulation is needed at all times to supply the necessary heat.

The humidity Should be graded from 100 per cent at the charging end to whatever humidity corresponds with the desired degree of dryness at the discharging end. The kiln should be so designed that the proper degree can be maintained at its every section. This may 3 be accomplished either by suitable ventilation Or by condensers at the sides.

Any well-made kiln which will fulfill the conditions required as to circulation and humidity control should work satisfactorily; but each case must be studied by itself and the various factors modified to suit the particular conditions of the problem. In every new case the lumber should be constantly watched and, if checking begins, the humidity should be increased until it stops. It is not reducing the circulation, but adding the'necessary moisture to the air, that should be depended on to prevent checking. For this purpose it is well to have steam jets in the kiln.

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