Abstract
This paper presents a theoretical analysis of a novel arrangement for the rotary dehumidifier (RD) which is radially divided to comprise a calming section that acts as a buffer upon the matrix shifting over from the regeneration to the dehumidification modes. The matrix is regenerated using the waste heat of a vapor compression (VC) unit through a heat pump/heat recovery system (HRS). Both the process air section and the calming section are internally cooled by an air stream which passes radially along the spokes that are in thermal contact with the desiccant metallic substrate, radially cooled rotary dehumidifier (RCRD). The analysis is carried out on six arrangements representing the changing steps from the RD to the RCRD. The differential equations are given and are numerically solved. Computations are presented for a silica gel RD bed with an aluminium substrate and a dehumidifier rotational speed of 10 rev/h, while the calming section occupies 5% of the total face area. The results indicated that the RCRD acquires a 4.3% improvement in the COP compared with the VC unit. Moreover, the VC evaporator temperature, when it is combined with the RCRD, would be 19°C compared with 11.5°C for the VC unit alone for given supply air conditions.
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