Space pressurization control system for high containment laborat

Details Space pressurization control system for high containment laborat Space pressurization control system for high containment laborat

1995-05-15

1998-02-24

Joyce, Harold

Ventilation

Having both inlet and outlet airways

Pressure regulation

454229, 454255, F24F 1100

Patent

active

057206589

ABSTRACT:
An apparatus and method for space pressure control in high containment laboratories. The system comprises a volumetric air flow controller and a differential pressure controller. The differential pressure controller couples to the volumetric air flow controller. To establish negative space pressurization in the laboratory, the differential pressure controller generates a variable offset signal for volumetric operation. In response to the offset signal, the volumetric air controller controls the ducted supply air to the laboratory at a set shortfall compared to the ducted exhaust air flow. The shortfall of ducted supply air creates a negative pressure which is also sensed by the differential pressure controller. The differential pressure controller reduces the variable offset signal to zero once the desired negative pressure level is attained. To maintain the negative pressure level, the supply and exhaust air flow rates must remain equal. Any change in the negative pressure level is detected by the differential pressure controller which will generate the offset signal required to restore the negative pressure level. Furthermore, if the negative pressure level is completely lost, either by breach of the laboratory containment barrier or by equipment failure, then the system will automatically revert to volumetric operation using the offset signal.

REFERENCES:
patent: 3402654 (1968-09-01), Berst
patent: 3766844 (1973-10-01), Donnelly et al.
patent: 4428529 (1984-01-01), Bentsen
patent: 4485729 (1984-12-01), Crittenden et al.
patent: 4705457 (1987-11-01), Belusa
patent: 4773311 (1988-09-01), Sharp
patent: 5115728 (1992-05-01), Ahmed et al.

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