Drying Processes with Gas Heat

Abstract

In DRYING, the process of removing water from a body or from the surface of the body being dried, water is evaporated and usually leaves as a vapor. Speed of drying can be increased through greater air circulation and lower relative humidity. Air circulation is attained simply. The relative humidity may be lowered by increasing the temperature of the air or body or by removing moisture from the air before it comes in contact with the work. Raising the temperature of air increases its capacity to take up water. Extracting moisture from the air with a dehumidifier or dehydrator produces lower relative humidities of the air before it is circulated. Two general methods of lowering the relative humidity of air used for drying have applications within certain well-defined limits. Many materials such as foods, chemicals, drugs, and leather are harmed by excessive heat and must be dried at low temperatures by the dehumidification method. Silica ...