| 摘要 |
A dehumidification system includes a rotating bed containing a mass of thermally regenerable desiccant divided into a process sector and a regeneration sector. Process air flows through the process sector and regenerant air flows through the regeneration sector. A damper is provided for controlling the flow of the regenerant air, and a heating element is interposed between the damper and the regeneration sector to heat the regenerant air upstream of the regeneration sector. A recycle stream portion of the regenerant air is recirculated and conducted downstream of the ambient make-up air damper for at least one additional pass through the heating element and the regeneration sector. A heat exchanger is interposed between the process air downstream of the process sector of the rotating bed and the regenerant air upstream of the regeneration sector of the rotating bed for transferring heat from the process air to the regenerant air. The procss air flows through the heat exchanger to produce an increasing temperature profile along one direction in the heat exchanger, and the regenerant air flows through the heat exchanger in the direction of the increasing temperature profile. A baffle is associated with the heat exchanger having a flow resistance comparable to the flow resistance of the heat exchanger so that the flow of process sector is proportional. A master controller is provided that controls the air stream flow rates and desiccant bed wheel speed in order to fully regenerate a fixed mass of the desiccant material under any operating condition.
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