Abstract:Hygroscopic material can moderate the indoor humidity variation due to its moisture buffering effect. This effect would change when used as interior finish mainly due to air exchange and wall moisture transfer. The author focused on clarifying the extent of the wall'’s influence on indoor moisture buffering and building humidity environment. A room model was established and the situation of no wall moisture transfer was simulated by adding a vapour barrier between the interior finish and the wall. Comparing th… Show more
“…The result relates to increased ventilation on the building envelope’s hygroscopic materials when opening doors. Some studies 46 have shown that high ventilation rates affect the moisture buffering effect of building envelope’s hygroscopic materials, thus increasing fluctuations in indoor relative humidity, but it also contributes to more indoor moisture removal, which helps to reduce indoor relative humidity and increases the optimal RH period (40–60%). Therefore, opening the door was conducive to indoor moisture removal and maintaining a comfortable humidity level, especially when the RH of the outdoor air was low.Figure 13.Variations in indoor and outdoor RH of the Kim-shaped house under open- and closed-door working conditions.…”
The ecological experience of traditional regional architecture provides an excellent reference for coping with increased energy consumption from cooling in tropical developing countries. However, the thermal comfort of traditional architecture and the effectiveness of its passive measures still need to be further verified in summertime conditions in hot and humid regions. In this study, we selected the traditional Li architecture, including boat- and Kim-shaped houses, for thermal environment tests. Subsequently, we analyzed the operative temperature and PMV-PPD index to determine their indoor thermal comfort and major passive strategies under hot summer conditions. Finally, we propose suggestions for improving the deficiencies of existing passive strategies. Our results show that the traditional Li architecture failed to satisfy indoor thermal comfort for more than half of the test time during the summer. Gable bottom openings and entry door ventilation can increase indoor ventilation with negligible increases in heat gain; however, existing ventilation efficiency is too low to substantially improve indoor thermal comfort. Additionally, we found that the evolution from boat- to Kim-shaped houses was not fully compatible with the significance of climatic adaptation. Kim-shaped houses benefited from the change in the envelope and external environment and its indoor moisture dissipation rate was accelerated; however, their eave shading made the wind speed attenuation more remarkable between indoor and outdoor. These results can help improve the indoor thermal comfort of traditional architecture in hot and humid regions.
“…The result relates to increased ventilation on the building envelope’s hygroscopic materials when opening doors. Some studies 46 have shown that high ventilation rates affect the moisture buffering effect of building envelope’s hygroscopic materials, thus increasing fluctuations in indoor relative humidity, but it also contributes to more indoor moisture removal, which helps to reduce indoor relative humidity and increases the optimal RH period (40–60%). Therefore, opening the door was conducive to indoor moisture removal and maintaining a comfortable humidity level, especially when the RH of the outdoor air was low.Figure 13.Variations in indoor and outdoor RH of the Kim-shaped house under open- and closed-door working conditions.…”
The ecological experience of traditional regional architecture provides an excellent reference for coping with increased energy consumption from cooling in tropical developing countries. However, the thermal comfort of traditional architecture and the effectiveness of its passive measures still need to be further verified in summertime conditions in hot and humid regions. In this study, we selected the traditional Li architecture, including boat- and Kim-shaped houses, for thermal environment tests. Subsequently, we analyzed the operative temperature and PMV-PPD index to determine their indoor thermal comfort and major passive strategies under hot summer conditions. Finally, we propose suggestions for improving the deficiencies of existing passive strategies. Our results show that the traditional Li architecture failed to satisfy indoor thermal comfort for more than half of the test time during the summer. Gable bottom openings and entry door ventilation can increase indoor ventilation with negligible increases in heat gain; however, existing ventilation efficiency is too low to substantially improve indoor thermal comfort. Additionally, we found that the evolution from boat- to Kim-shaped houses was not fully compatible with the significance of climatic adaptation. Kim-shaped houses benefited from the change in the envelope and external environment and its indoor moisture dissipation rate was accelerated; however, their eave shading made the wind speed attenuation more remarkable between indoor and outdoor. These results can help improve the indoor thermal comfort of traditional architecture in hot and humid regions.
“…Two types of indicators were defined to quantify how much of the buffering effect was created at a given macroenvironment fluctuation. Equation ( 10) is the absolute reduction of fluctuation, respectively, for temperature buffering (TB) [°C] and equation (11) is the humidity buffering (HB) [% RH]:…”
Section: Measurement For Water Vapour Diffusion Coefficientmentioning
confidence: 99%
“…Buildings with a large thermal mass and hygroscopic inertia, producing airtight and thermally insulated envelopes, impede heat and mass transfer between outdoor and indoor, thus stabilising the indoor environment. [9][10][11] In general, the buildings which provide low energy operation for collection storage have three features for passive environmental control, 'high thermal resistance value and energy storage capacity', 'good building airtightness' and 'effective absorption dehumidification'. [12][13][14] Due to the passive environmental control, the indoor air temperature and relative humidity can be maintained within the comfort zone while the total energy consumption falls by 69.2% in a measured winter.…”
Storage enclosures made of paper-based materials are commonly used to store and classify archival documents for their hygrothermal buffering effect. However, there is little information about papermaking and quantitative studies on such an effect. Aiming to assess the feasibility of using the enclosure to buffer temperature and relative humidity fluctuations, without any detrimental effect on the collections, this paper reports four measurements and a feasibility assessment: thermophysical properties of the enclosure material, hygroscopic properties of the material, air change rate of the enclosure, buffering effect in a climate chamber and the assessment of safeguarding collections without causing any detrimental effect. The measurement results show that the enclosure can buffer macro-environmental fluctuations, which was considered sufficient to mitigate temperature and humidity fluctuations from the room environment and to secure a condition inside that is safe for the collections. The paper-based material determines the buffering capacity of the enclosure, and an appropriate air change rate ensures average temperature and relative humidity inside the enclosure at a controllable level and prevents off-gassing accumulation. This work provides assurance that using enclosures is an effective approach to collection storage and establishes a significant basis for further heat–air–moisture simulation and energy-saving optimisation study in the service operation.
“…Additionally, Controlling relative humidity is crucial for maintaining building longevity, ensuring proper storage conditions, and minimizing energy usage [15][16][17]. Humidity control materials (HCM) are porous materials that can regulate ambient humidity and temperature without external power or mechanical equipment.…”
Combining phase change materials with hygroscopic materials in building construction is considered a promising solution for improving the indoor environment of building envelopes. In this study, a diatomite-based Phase Change Humidity Control Material (PCHCM) sourced from the Sig mine in northwest Algeria was used as a finishing layer in buildings and experimentally analyzed in a thermal chamber. The experiment involved exposing three brick walls with different insulation layers (mortar, Algerian diatomite, and PCHCM) to controlled temperatures and humidities using a ZL-7918A controller. Temperature fluctuations were measured every 30 minutes for 38 hours using an infrared camera (TESTO890) based on the experimental conditions. Two sets of results were obtained depending on the conditions. PCHCM demonstrated better output conditions when the charging temperatures were equal to or greater than the PCM fusion temperature. However, diatomite alone provided more interesting results when the charging temperatures were below the PCM fusion temperature. The numerical study, compared to a previous benchmark, showed good agreement with a relative error of less than 4.8%. A second analysis focused on two types of PCHCM: the first type had one PCM with a melting point of 28 °C, while the second type combined two PCMs with different melting points (28 °C and 22 °C). Comparative analysis revealed a better desired temperature and humidity when using the second type of PCHCM on the inner side of the wall.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
