. The Bell System technical journal . Fig. 19—Silica gel drying unit. ducts are located at the ceiling opposite to the grill openings, anyregain of moisture in the room itself is largely concentrated in airstrata above the cables. Operation of the Baltimore conditioning system (Fig. 19) may bedescribed briefly as follows: Approximately 10,300 cu. ft. of air perminute from the storage room is mixed with 2600 cu. ft. per minute ofoutside fresh air. The temperature of this air mixture which may be ashigh as 100° F. is lowered to a maximum of 68° F. by passing it overand around copper tubes throug
. The Bell System technical journal . Fig. 19—Silica gel drying unit. ducts are located at the ceiling opposite to the grill openings, anyregain of moisture in the room itself is largely concentrated in airstrata above the cables. Operation of the Baltimore conditioning system (Fig. 19) may bedescribed briefly as follows: Approximately 10,300 cu. ft. of air perminute from the storage room is mixed with 2600 cu. ft. per minute ofoutside fresh air. The temperature of this air mixture which may be ashigh as 100° F. is lowered to a maximum of 68° F. by passing it overand around copper tubes through which water at 58-60° F. is circu-lating. The cool air then passes through the first silica gel adsorberwhere it is partially dehydrated; then it is again cooled and is passedinto the second adsorber where the drying is completed and from which 452 BELL SYSTEM TECHNICAL JOURNAL. T -[|_- 0. - 10 o ^ > O 1- z z> uz < o-
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