Comprehensive correction of thermal conductivity of moist porous building materials with static moisture distribution and moisture transfer

Wang, Yingying; Zhao, Zejiao; Liu, Yanfeng; Wang, Dengjia; Ma, Chao; Liu, Jiaping

doi:10.1016/j.energy.2019.03.178

Cited by 20 publications

(9 citation statements)

References 26 publications

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“…Heat transport and storage parameters acquired for 90-days samples in dependence on moisture content are shown in Figure 5 and Figure 6. As confirmed by many researchers in recent decades, the thermal properties of the porous construction materials are significantly affected by moisture content [49,94,95]. This is due to the high thermal conductivity of water ( λ w = 0.56 W/(m∙K) at 20 °C) compared to dry air ( λ a = 0.025 W/(m∙K) at 20 °C) [96] that fills the materials pores.…”

Section: Resultsmentioning

confidence: 96%

Mortars with Crushed Lava Granulate for Repair of Damp Historical Buildings

et al. 2019

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In this paper, crushed lava granulate was used as full silica sand replacement in composition of repair mortars based on hydrated lime, natural hydraulic lime, or cement-lime binder. Lava granules were analyzed by X-ray fluorescence analysis (XRF), X-ray diffraction (XRD), and scanning electron microscopy (SEM). Particle size distribution of both silica and lava aggregates was assessed using standard sieve analysis. Hygrothermal function of the developed lightweight materials was characterized by the measurement of complete set of hygric, thermal, and structural parameters of the hardened mortar samples that were tested for both 28 days and 90 days cured specimens. As the repair mortars must also meet requirements on mechanical performance, their compressive strength, flexural strength, and dynamic Young’s modulus were tested. The newly developed mortars composed of lava aggregate and hydrated lime or natural hydraulic lime met technical, functional, compatibility, and performance criteria on masonry and rendering materials, and were found well applicable for repair of historically valuable buildings.

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Section: Resultsmentioning

confidence: 96%

Mortars with Crushed Lava Granulate for Repair of Damp Historical Buildings

et al. 2019

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“…Mukai et al [19] researched the theories of coupled hygrothermal transfer in buildings, they built an experimental platform to measure the temperature, relative humidity, and indoor and outdoor temperatures and compared the measured results with the simulation values; at the same time, they also compared the indoor temperature, relative humidity, heat flow, and humidity flow of the inner layer materials and insulation materials of buildings under natural conditions, and used the WUFI-Plus software to simulate energy consumption with humidity transfer time taken into consideration. To stabilize the humidity and indoor temperature within a comfortable range for human body, Wang et al [20] considered the issues of power grid security and building energy conservation, and established an air conditioning energy consumption monitoring system under climatic conditions in hot and humid areas; then, for the problem of increased energy consumption caused by heat and humidity and the traditional treatment methods, they constructed a BP neural network optimized by particle swarm algorithm and accurately predicted the energy consumption of air conditioners. The coupled hygrothermal transfer process will directly affect the thermal performance of materials, the energy consumption of buildings, and the thermal comfort of the internal environment.…”

Section: Introductionmentioning

confidence: 99%

Energy Consumption Assessment and Energy-Saving Management in Tourist Resorts

Lou¹,

Liang²,

Gao³

2021

IJHT

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For tourism industry, the ever-increasing energy consumption and the high carbon emissions are requiring close attention and prompt solution, thusly endowing the research on the energy-saving of buildings in tourist resorts very important and practical significance. For this reason, this study carefully considered the actual situations such the energy utilization method and the hygrothermal environment of tourist resorts and constructed a hygrothermal transfer model and the corresponding hygrothermal balance equation for buildings in tourist resorts; then, the paper proposed a few effective strategies for the energy-saving management of buildings in tourist resorts, and studied the annual energy consumption of tourist resorts and gave a building energy consumption analysis. At last, experimental results verified the rationality and effectiveness of the proposed energy consumption assessment and energy-saving management methods for tourist resort buildings in hygrothermal environment. This study provided a useful reference for the energy-saving methods of buildings in tourist resorts.

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“…In thermal calculations, the moisture content of materials plays a significant role in heat transfer. The thermal conductivity of the material will depend on the sorption moisture [1][2][3][4][5]. For this reason, the protective properties of the enclosing structures may decrease.…”

Section: Introductionmentioning

confidence: 99%

Study of the dependence of equilibrium sorption humidity of heat-insulating products on temperature

Petrov

Kupriyanov

2021

E3S Web Conf.

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The desiccator method for products like mineral wool has a low accuracy, which is due to the small mass of the samples and the uneven content of the binder between the samples. The standard method does not involve testing materials at different temperatures. However, the value of sorption moisture depends not only on the nature and structure of the material, but also on the temperature conditions. At the moment, the regularities of changes in the sorption moisture content of materials depending on the air temperature have been studied only in separate scientific works and do not cover the entire spectrum of modern building materials. The paper presents the results of a study of the sorption moisture content of modern mineral wool products at various temperatures above 0 ºС. The results show an increase in sorption humidity with decreasing temperature from 22 ºС to 0 ºС. The greatest increase in humidity occurs at values of relative air humidity in the range of 90–97 %. It is shown that the standard desiccator method for studying sorption moisture requires scientific development and increased control of test conditions with decreasing temperature.

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Comprehensive correction of thermal conductivity of moist porous building materials with static moisture distribution and moisture transfer

Cited by 20 publications

References 26 publications

Mortars with Crushed Lava Granulate for Repair of Damp Historical Buildings

Mortars with Crushed Lava Granulate for Repair of Damp Historical Buildings

Energy Consumption Assessment and Energy-Saving Management in Tourist Resorts

Study of the dependence of equilibrium sorption humidity of heat-insulating products on temperature

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