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Desiccant System Description

A liquid desiccant air conditioning system consists of two main components (1) the desiccant dehumidifier, and (2) the regenerator/regeneration heat source, as shown in Fig. 3.1. The role of the dehumidifier is to reduce the moisture content of the building supply air to provide a comfortable environment for occupants. As moisture is absorbed by the liquid desiccant solution, it becomes dilute and thus its ability to absorb moisture is reduced. In order to re-use the desiccant solution, the regenerator and regenerator heat source are used to evaporate off the moisture gained, thus re-concentrating the liquid desiccant solution. Following

Liquid desiccant system layout and operation regeneration

Fig. 3.1 Liquid desiccant system layout and operation regeneration, the liquid desiccant solution should be reduced in temperature close to that of the supply air requirement, to facilitate both latent and sensible cooling.

In this thesis, a membrane based dehumidifier and regenerator heat and mass exchanger (HMX) have been employed to overcome issues of desiccant entrainment in the supply airstream. Because the dehumidification and regeneration processes involve both the transfer of heat and mass (water vapour), they are referred to as heat and mass exchangers. Next, Sect. 3.2 provides an evaluation of a suitable liquid desiccant solution for the SOFC tri-generation system.

 
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