Buildings Indoor Air Quality requires a control in the Relative Humidity parameter. In passive architecture in humid climates relative humidity is even more important for human comfort and difficult to control. Therefore, nowadays, there is a research on dehumidifying systems. The present article shows an innovative dehumidifying panel composed of a plaster and Calcium Chloride salt. Laboratory tests are carried out to establish its viability as an indoor air moister regulator integrated in common plaster building interior coatings. There are two types of tests that have been carried out in two consecutive empirical phases: in the first phase, the tests of characterization of the Calcium Chloride as a desiccant are carried out; in a second phase, the dehumidifying panel as a whole is tested. Finally, both types of empirical tests show the efficiency and viability as an air moisture passive control system. ResumenEl confort interior en los edificios requiere de un control de la Humedad Relativa. En la arquitectura pasiva en climas húmedos esta humedad relativa es aún más importante para el confort humano y difícil de controlar; por lo que, actualmente, se investigan sistemas de deshumidificación. El presente artículo presenta el diseño y evaluación de un innovador panel deshumidificador compuesto de yeso y de sal de Cloruro Cálcico. Se llevan a cabo ensayos para establecer su viabilidad como regulador de humedad integrado en recubrimientos interiores comunes como el yeso. Los ensayos son de dos tipos, realizados en dos fases consecutivas: en una primera fase, se realizan los ensayos de caracterización del comportamiento del Cloruro Cálcico como desecante; y, en una segunda fase, se ensaya el comportamiento del panel en su conjunto. Finalmente, ambos ensayos demuestran la eficacia y viabilidad del conjunto como regulador de humedad.
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