The Hygric Performances of Moisture Adsorbing/Desorbing Building Materials

Abstract

Controlling indoor relative humidity is of great importance in the evaluation of thermal comfort and perceived air quality. This study aimed to develop a new mineral fiber board as an interior surface material with high capacity of moisture adsorption and desorption. A series of experiments were carried out in this study using an accurately controlled chamber, mock-up rooms, and real-scale test houses. The chamber test was conducted to measure the moisture adsorption and desorption content of the materials. In the mock-up rooms, the effects of the new mineral fiber board on indoor humidity were investigated under three different conditions. The three different conditions include: 1) a mock-up room with an electric humidifier, 2) a mock-up room with an open water basin, and 3) a mock-up room without artificial humidifying measures. In the real-scale test houses, the efficiency of the new mineral fiber board was also investigated under two different conditions of low-humidity and very high-humidity. Through the chamber test, it was found that the moisture adsorption content of the new mineral fiber board was three times more than that of the ordinary mineral fiber board. The moisture desorption content of the new board was also two and half times more than that of the ordinary mineral fiber board. In the mock-up test, the newly developed mineral fiber board could also control indoor humidity levels effectively by desorbing moisture under low humidity conditions. However, through the real-scale test, it was found that the new mineral fiber board could not absorb or desorb indoor moisture effectively if extremely dry or humid conditions last for a long time. Overall, the new mineral fiber board was proven to be effective in controlling indoor moisture except under extremely dry or humid conditions.

Preparation and Characteristics of Humidity Controlling Characteristic Porous Ceramics with Waste Fiberglass and Waste Catalyst

“…Chemical composition: X-ray fluorescence (XRF) analysis was performed with an automated RIX 2000 spectrometer [15]. The specific surface area, specific pore volume and average pore diameter (BJH method) of the samples were measured by N 2 adsorptiondesorption isotherms at 77 K using a surface area analyzer (Micromeritics, ASAP 2000).The adsorption/desorption efficiency were measured using the JIS A 1470 method [16], [17]. Table I presents the compositions of the waste fiberglass and waste catalyst.…”

Humidity‐conditioning mesoporous molecular sieves synthesized from thin‐film‐transistor liquid‐crystal‐display waste glass and SiC sludge

“…The sample was suspended in acetone, and droplets of the suspension were placed on a polymer micro grid supported on a Cu grid. The adsorption–desorption efficiency was measured using the JIS A 1470‐1 method . Before conducting moisture adsorption and desorption tests, the specimen was preconditioned inside the chamber with the ambient temperature of 23 ± 0.5°C and the relative humidity (RH) of 53% until the specimen reached a constant mass.…”

Study on heat and moisture transfer characteristics of HPCMs

“…Tomita et al (2004) studied the humidity-control performance of silica-based hygroscopic materials based on equilibrium analysis and kinetics, and found that this material was very suitable for humidity control in airtight rooms. Kim et al (2010) developed a novel mineral fiber board, whose hygroscopic performance was three times more than the ordinary board and had an excellent performance in moderating indoor humidity. Feng et al (2018) tested the thermal and hygroscopic performance of the metal-organic frame material.…”