Dry Room Design
Use the key below to identify components
A Return air plenum wall & barrier eliminates high moisture areas by sweeping air across the entire room.
B Makeup air duct.
C Reactivation exhaust through building wall or roof. Can provide low grade heat in the winter.
D Redundant D/H system can provide 50% to 100% system backup for production dry rooms.
E Dehumidification system with desiccant wheel and all heating/cooling for dry room. All systems use double wall construction with double wall access for controls and valves. This eliminates leakage at piping connections.
F Water cooled condensing unit piped to remote dry cooler. Air cooled remote units and screw compressor systems are also provided.
G All welded aluminum ducting to prevent moisture infiltration or leakage.
H 3″ modular wall panels with smooth white aluminum skin on both sides.
I Airlocks for personnel entry/exit and gowning when also a clean room.
J Dry air supply ducts to machine enclosures for provision of ultra-dry air to critical processes.
Dry Room Envelope
Dry rooms utilize prefabricated, metal clad panels for all walls, and roof to insure moisture infiltration is controlled to near zero. The dry room must be a completely self-contained unit, with all essential mechanical conditioning equipment, controls, and ductwork designed to maintain the dry room at 72ºF, ±2º, 2% R.H. (1.8 gr/lb) or drier, as specified by the end user.
Wall and roof panels shall be constructed of rigid insulating material with smooth tempered skins bonded to each side of the panel core. Panels are assembled using cam lock devices, which pull the panels firmly together to form a tight seal. Panel seams are than sealed with silicone to prevent air and moisture infiltration along cracks. Floors are sealed with an appropriate conductive, vapor barrier material.
Perimeter doors are manufactured of the same type material as the walls, with double gasketing on three sides and an adjustable gasket seal on the bottom. An airlock or room vestibule is required to prevent moisture infiltration and maintain pressure no less than .03” positive, to prevent infiltration.
Mechanical Conditioning System
The dry room conditioning system shall consist of a custom designed desiccant drying system assembled to provide continuous dewpoint and temperature control. Whenever possible, the conditioning system should be located directly adjacent to the dry room. This concept reduces leakage possibilities from long runs of ductwork, compromising the system’s ability for precise temperature and dewpoint control. A desiccant dehumidifier is utilized because of its ability to achieve a delivered air condition as low as .047 gr/lb. of dry air (-76ºF dewpoint). This unit provides continuous dewpoint control. The air circulation and air distribution system is uniform throughout the room utilizing a distribution plenum. Air is returned to the conditioning system through grills in the walls. The ceiling plenum also houses lighting troffers and required ducting.