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The Influence of Two Natural Reinforcement Fibers on the hygrothermal properties of Earthen Plasters in Mogao Grottoes of China

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Journal of Renewable Materials 2020年第12期8卷 1691-1710页

作者： Wenbei Bi Zengfeng Yan Huan Zhao Lixin Sun Xudong Wang Zhengmo Zhang School of Architecture Xi’an University of Architecture and TechnologyXi’an710055China China Academy of Building Research Beijing100044China Conservation Institute Dunhuang AcademyDunhuang736200China School of Engineering and Mechanics Lanzhou UniversityLanzhou730000China

Murals in Mogao Grottoes consist of three parts:support layer,earthen plasters and paint *** earthen plasters play a key role in the preservation of *** is a mixture of Dengban soil,sand,and plant *** different natural fibers,hemp fiber and cotton fiber,were reinforced to earthen plasters in the same percentage to evaluate the influence on hygrothermal *** two types of earthen plasters were studied:one containing hemp fiber in the fine plaster(HFP)and the other containing cotton fiber in the fine plaster(CFP).Specific heat capacity,dry thermal conductivity,water vapor permeability,and sorption isotherms were *** results showed that the difference between two natural fibers has much more impact on the hygric properties(water vapor permeability and sorption isotherms)of earthen plasters than on their thermal performance(specific heat capacity and dry thermal conductivity).The CFP with higher density has higher thermal conductivity than the HFP with lower *** no significant differences of specific heat capacity were *** with HFP,CFP used in murals can reduce the rate of water transfer and prevent salt from transferring water to the mural *** overall findings highlight that all these features of CFP are beneficial to the long-term preservation of mur*** study of the earthen plasters in Mogao Grottoes is of general significance,and the measured properties can be used to obtain coupled heat and moisture analysis of the earthen plasters and to dissect the degradation mechanism of murals.

关键词： Earthen plasters natural reinforced fibers hygrothermal properties dry thermal conductivity water vapor permeability sorption isotherms

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Cross validation of hygrothermal properties of historical Chinese blue bricks with isothermal sorption experiments

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Frontiers of Architectural Research 2021年第1期10卷 164-175页

作者： Yonghui Li Yan Ma Huarong Xie Jiaomin Li Xinjian Li School of Architecture Southeast UniversityNanjing210096China Key Laboratory of Urban and Architectural Heritage Conservation(Southeast University) Ministry of EducationNanjing210096China School of Architecture Nanjing Tech UniversityNanjing211816China

The historical,cultural,and social value of heritage buildings mandates special protection of these *** brick is one kind of the main construction materials of heritage buildings,which is porous material and easily subject to deterioration due to environmental factors such as ***,determining the dynamic moisture content rule of materials under fluctuant ambient humidity is necessary for preventative *** study measured the equilibrium moisture content of eight types of Chinese blue bricks under isothermal conditions with varying humidity *** results show that when ambient humidity increased from 10%to 90%,the moisture sorption of historical Chinese blue bricks tripled,which is 3 times greater than that of modern Chinese blue bricks and 10(at low humidity)to 20 times(at high humidity)greater than that of clay bricks in the international *** results contribute to the improvement of the international building material database and research related to hygrothermal performance of heritage buildings in East Asia.©2021 Higher Education Press Limited *** services by Elsevier *** behalf of KeAi Communications *** is an open access article under the CC BY-NC-ND license(http://***/licenses/by-nc-nd/4.0/).

关键词： Heritage building hygrothermal properties Blue brick Isothermal sorption curve

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Experimental Study of Temperature and Humidity Variations in an Incubator Fitted with a Flat-Plate Collector

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Smart Grid and Renewable Energy 2024年第11期15卷 267-275页

作者： Germain Wende Pouiré Ouedraogo Boureima Dianda Boureima Kabore Carole Flaviane Teguiwendé Sawadogo Sié Kam Ecole Suprieure dIngnierie (ESI) Universit Yembila Abdoulaye TOGUYENI Fada NGourma Burkina Faso Laboratoire dEnergies Thermiques Renouvelables Universit Joseph KI-ZERBO Ouagadougou Burkina Faso Centre national de la recherche scientifique et technologique Ouagadougou Burkina Faso Unit de Formation et de Recherche Sciences et Technologies (UR-ST) Universit Norbert ZONGO Koudougou Burkina Faso

In Burkina Faso, where livestock farming is widely practiced, particularly in rural areas without access to electricity, solar energy offers a viable alternative due to the country’s abundant sunshine. To support poultry farmers in increasing their production, we developed a solar-powered incubator equipped with a flat-plate collector, requiring no grid electricity. This is a new approach that we want to experiment with because the incubators on the global market operate either with the electricity grid, photovoltaic, gas or oil and not a solar thermal concentrator. This solar concentrator represents the heat source of the device during the day. We plan to look for rocks with high thermal inertia in order to heat them during the day using another flat solar concentrator and then introduce them into the incubator at night to continue the incubation process. In 2022, we conducted a simulation to study temperature variation inside the incubator. In this work, we built a prototype to experimentally evaluate key hydrothermal properties such as air temperature and humidity. Furthermore, we will not introduce rocks into the incubator overnight but will let the system run overnight to see how the hygrothermal properties vary. The findings revealed temperature fluctuations from 25˚C to 65˚C, instead of the desired 36˚C to 38˚C, and humidity levels ranging from 15% to 57%, instead of the target 55% to 75%. Solutions have been proposed to enhance the system’s performance.

关键词： Solar Incubator Flat-Plate Collector hygrothermal properties

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