Influence of Hygroscopic Materials in the Stabilization of Relative Humidity Inside Museum Display Cases

Abstract The preservation of artworks is profoundly influenced by fluctuations in temperature and, especially, relative humidity. Thus, it is crucial for hygrothermal conditions in museums to be stabilized, particularly inside display cases. Today there are advanced hygrothermal simulation models available that enable us to quantify the temperature and relative humidity fluctuations of the air inside the museum display cases, provided that we know the climate in the exhibition rooms, the degree of ventilation of the display case and the constitution of its surroundings. However, the placement of hygroscopic materials inside display cases also influences the fluctuation of interior relative humidity. This paper presents the results of an experimental study conducted in a flow chamber, showing the enormous potential of hygroscopic materials in stabilizing relative humidity inside of display cases. In addition, it presents a numerical simulation study conducted in display cases evaluating how the insertion of hygroscopic finishing materials in the base of the display case, under varying ventilation conditions influences stabilization of interior relative humidity.