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An air separation unit for an OBOGS includes a housing having an inlet for receiving a wet inlet air and an outlet for outputting a dry product gas. The housing includes an outer side wall and annular walls defining a series of concentric annular chambers. A first annular chamber is coupled to the i

An air separation unit for an OBOGS includes a housing having an inlet for receiving a wet inlet air and an outlet for outputting a dry product gas. The housing includes an outer side wall and annular walls defining a series of concentric annular chambers. A first annular chamber is coupled to the inlet and includes a desiccant material to receive the wet inlet air and output a dried air. An unfilled second annular chamber is coupled to the first annular chamber. A third annular chamber is coupled to the second annular chamber at a first end and the outlet at a second end. The third annular chamber receives air separation material to selectively remove unwanted constituents from the dried air and output the dry product gas. A tap may be coupled to the second annular chamber so that dried air may be removed from the housing.

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1. An air separation unit for an OBOGS comprising a housing having an inlet for receiving a wet inlet air and an outlet for outputting a dry product gas, the housing including an outer side wall and first, second and third annular walls to thereby define a series of concentric annular chambers withi

1. An air separation unit for an OBOGS comprising a housing having an inlet for receiving a wet inlet air and an outlet for outputting a dry product gas, the housing including an outer side wall and first, second and third annular walls to thereby define a series of concentric annular chambers within the housing, wherein: a. a first annular chamber is defined by the outer side wall and the first annular wall and is fluidly coupled to the inlet, the first annular chamber including a desiccant material configured to receive the wet inlet air and output a dried air;b. an unfilled second annular chamber defined by the first annular wall and the second annular wall and fluidly coupled to the first annular chamber via a first passageway; andc. a third annular chamber defined by the second annular wall and the third annular wall and fluidly coupled to the second annular chamber via a second passageway at a first end and the outlet at a second end, the third annular chamber configured to receive air separation material to selectively remove unwanted constituents from the dried air and output the dry product gas. 2. The air separation unit bed of claim 1 further comprising a fourth annular chamber defined by the third annular wall and a central post and fluidly coupled to the third annular chamber via a third passageway at a first end and the outlet at a second end, the fourth annular chamber configured to receive air separation material to selectively remove unwanted constituents from the dried air and output the dry product gas. 3. The air separation unit of claim 2 wherein at least a portion of the air separation material in the third annular chamber is different than at least a portion of the air separation material in the fourth annular chamber. 4. The air separation unit of claim 1 wherein the housing further includes a dried air tap fluidly coupled to the second annular chamber whereby a portion of the dried air may be removed from the housing before the dried air enters the third annular chamber. 5. The air separation unit of claim 1 wherein the air separation material comprises a zeolite. 6. The air separation unit of claim 5 wherein the zeolite is selected to adsorb nitrogen gas and output an oxygen product gas. 7. The air separation unit of claim 1 wherein the desiccant material comprises a porous or non-porous alumina-based particulate material. 8. The air separation unit of claim 1 wherein the first passageway comprises an orifice defined within the first annular wall, the orifice having a diameter smaller than a diameter of the desiccant material. 9. An air separation system for an OBOGS comprising: a. first and second air separation units, each air separation unit comprising:a housing having an inlet for receiving a wet inlet air and an outlet for outputting a dry product gas, the housing including an outer side wall and first, second and third annular walls to thereby define a series of concentric annular chambers within the housing, wherein: i. a first annular chamber is defined by the outer side wall and the first annular wall and is fluidly coupled to the inlet, the first annular chamber including a desiccant material configured to receive the wet inlet air and output a dried air;ii. an unfilled second annular chamber defined by the first annular wall and the second annular wall and fluidly coupled to the first annular chamber via a first passageway, the housing including a dried air tap fluidly coupled to the second annular chamber whereby a portion of the dried air may be removed from the housing;iii. a third annular chamber defined by the second annular wall and the third annular wall and fluidly coupled to the second annular chamber via a second passageway at a first end and the outlet at a second end, the third annular chamber configured to receive air separation material to selectively remove unwanted constituents from the dried air and output the dry product gas; andb. a switchable valve assembly configured to receive the wet inlet air and selectively deliver the wet inlet air to the first air separation unit when in a first state and the second air separation unit when in a second state; andc. a plenum fluidly coupled to the dried air tap of each of the first and second air separation units at a first end and to the switchable valve assembly at a second end, the plenum configured to receive a portion of the dried air from the selected first or second air separation unit and selectively cycle the switchable valve assembly between the first state and the second state as a function of a purity of the dry product gas being output from the selected air separation unit receiving the wet inlet air. 10. The air separation system of claim 9 further comprising: d. a control unit operably coupled to the plenum whereby the plenum selectively cycles the switchable valve assembly between the first and second states upon receipt of a control signal from the control unit. 11. The air separation system of claim 10 further comprising: e. an output gas sensor downstream from the outlet of each of the first and second air separation units and configured to measure the purity of the dry gas product, wherein the control unit sends the control signal to the plenum when the measured purity falls below a threshold limit.