Analysis of a bi-desiccant system of dehumidification.

摘要

This research studies the behavior of a liquid-solid system of dehumidification which is applicable to passive energy applications such as solar energy. A liquid desiccant typically has better regeneration characteristics than a solid desiccant, and is therefore more easily regenerated using solar energy. Solid desiccants have much better drying characteristics than liquid desiccants, and serve well in the dehumidification step. An attempt has been made in this study to find a compatible pair of desiccants, one liquid and one solid, whereby the desirable characteristics of both are used.;The system evaluated involves a packed bed of solid desiccant which is wetted with the liquid desiccant. This be-desiccant bed is the dehumidifying section of the process. The liquid is then regenerated on its own. The bi-desiccant bed is regenerated by flushing it with fresh liquid.;A thermodynamic analysis has shown that it is possible to achieve the desired result provided the appropriate solid and liquid desiccants are found. The critical factor in this determination is the distribution of moisture between the air stream, the solid, and the liquid. The capacity of a liquid desiccant which provides low humidity in the air stream can be improved with a solid partner provided the solid readily absorbs moisture from the liquid and can be regenerated with fresh liquid.