Thermal and humid environment of rammed-earth dwellings in Northwest Sichuan

Jia-hua, Liang; Tan, Jiaye; Bin, Jiang

doi:10.1177/1420326x211061113

Cited by 8 publications

(4 citation statements)

References 23 publications

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“…In this space, the air temperature was lower compared to S1 and S2, where the interior wall covering is cement (Figure 7). It should be noted that traditional materials such as cement and concrete increase energy consumption, heat retention and thermal variations in buildings (Liang, Tan and Jiang, 2022;Gondal, Syed-Athar and Khurram, 2021). In addition, incorporation of a green roof in buildings tends to improve the thermal environment in the indoor spaces and, consequently, the feeling of thermal comfort (Rahman, Zaid and Shuhaimi, 2022).…”

Section: Resultsmentioning

confidence: 99%

Thermal Comfort and Microclimate in Indoor Spaces of Low-rise Residential Buildings in Dry Tropical Climate

Therán-Nieto,

Pérez-Arévalo,

Marín-Carranza

et al. 2023

JDBE

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The aim of this research is to analyze thermal comfort and microclimate for indoor spaces in low-rise residential buildings in dry tropical climate. The study area is the municipality of Palmar de Varela in northern Colombia. The experimental methodology is based on measuring three microclimatic parameters: air temperature (Ta), relative humidity (RH) and natural ventilation (W). The study assessed the thermal sensation in indoor spaces based on Thermal Sensation Vote (TSV) and Predicted mean vote (PMV). Data gathered from surveys were analyzed with data mining technologies. The findings suggest that suspended ceilings and ceramic tiles aid to the thermal equilibrium of the building, resulting in a 1.1 °C decrease in indoor air temperature. Likewise, the correlation between temperature and wind (r = -0.72; -0.56) indicates that natural ventilation in buildings can alleviate thermal discomfort. Based on the thermal sensation evaluation, the predominant feeling reported by interviewees in indoor spaces was warm (2) in S1 and S2, and slightly warm (1) in S3. In addition, the correlation between air temperature and comfort sensation in indoor spaces (r = 0.64; 0.44) suggests that temperature has a direct impact on thermal sensation votes.

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Section: Resultsmentioning

confidence: 99%

Thermal Comfort and Microclimate in Indoor Spaces of Low-rise Residential Buildings in Dry Tropical Climate

Therán-Nieto,

Pérez-Arévalo,

Marín-Carranza

et al. 2023

JDBE

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“…The test results for the thermal conductivity and thermal–diffusion coefficient, and the calculation results for the specific heat capacity [ 26 ] are shown in Figure 5 . To improve the accuracy of the fitting results, a quadratic polynomial was used to fit the experimental data, and the functional relationship between the thermal conductivity and thermal–diffusion coefficient of the rammed–earth material and water content was obtained as follows: λ = 0.03 w + 5.139 w 2 + 0.551, D = 8.18 × 10 −9 w − 2.57 × 10 −11 w 2 + 3.591 × 10 −7 , where λ is the thermal conductivity (W/m·K), D is the thermal–diffusion coefficient (m 2 /s), and w is the moisture content weight.…”

Section: Study Of Thermal and Humidity Physical Properties Of Rammed–...mentioning

confidence: 99%

“…The test results for the thermal conductivity and thermal-diffusion coefficient, and the calculation results for the specific heat capacity [26] are shown in Figure 5. To improve the accuracy of the fitting results, a quadratic polynomial was used to fit the experimental data, and the functional relationship between the thermal conductivity and thermal-diffusion coefficient of the rammed-earth material and water content was obtained as follows:…”

Section: Thermal Performance Analysismentioning

confidence: 99%

Thermal and Humidity Performance Test of Rammed-Earth Dwellings in Northwest Sichuan during Summer and Winter

Jiang,

et al. 2023

Materials

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Rammed-earth dwellings have a long history in the construction field. It is a natural material that is both green and environmentally friendly. In recent years, the advantages of rammed earth, such as environmental protection, low cost, and recyclability, have attracted considerable attention. In this study, the thermal and humidity physical properties of rammed–earth materials in the northwest Sichuan region, the variation laws of thermal physical parameters, such as the thermal conductivity of rammed–earth under different moisture content conditions, and isothermal moisture absorption and desorption curves were investigated. The results indicated that the thermal physical parameters of the rammed earth measured in the experiment increased with an increase in moisture content, and its moisture absorption performance was better than the moisture release performance in the range of 11.31–97.3% relative humidity. The experimental site, Mianyang City, Sichuan Province, is a subtropical monsoon humid climate zone characterized by warm winters and hot summers with four distinct seasons. In this study, we investigated the hygrothermal coupling transfer of walls, as well as the indoor temperature and humidity changes in new rammed–earth buildings during summer and winter climates. During the test period, the maximum indoor temperature in summer was 35.08 °C, the minimum temperature was 33.76 °C, and the average daily temperature fluctuation was 3.62 °C. In winter, the maximum indoor temperature was 8.59 °C, the minimum temperature was 6.18 °C, and the average daily temperature fluctuation was 1.21 °C. An analysis was performed on the thermal insulation performance of rammed–earth buildings in an extremely high-temperature climate during summer, thermal insulation performance, the thermal–buffering capacity of walls in a low–temperature and high-humidity climate during winter, and thermal and humidity regulation of indoor environments provided by walls during summer and winter. The results showed that the rammed–earth buildings exhibited warmth in winter, coolness in summer, and a more stable and comfortable indoor environment.

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“…

is the external water vapor flux of sludge. Wherein the expression of water diffusion mass flux

is Equation (4) [ 28 ]:

…”

Section: Numerical Simulationmentioning

confidence: 99%

Numerical Simulation of Heat and Mass Transfer in Sludge Low-Temperature Drying Process

Wang

Lai

et al. 2022

Entropy

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Based on the sludge mass transfer flux model, this paper conducts a simulation study on the drying characteristics of sludge under low-temperature environment and compares it with the previous experimental results. It is found that when the sludge moisture content is low, the change of its drying curve is basically consistent with the experimental results, but there is a large error when the sludge moisture content is 0.4–0.6. In order to better simulate sludge drying characteristics, a model of cracking and shrinkage coefficients based on sludge moisture content is proposed, and the effective diffusion coefficient and mass transfer coefficient are modified. The maximum error between simulation and experiment is reduced to 23.78%. Based on this model, the sludge drying mechanism was studied. It was found that heat transfer and diffusion played a major role in the initial stage of sludge drying, and diffusion played a major role in sludge drying 30 min later.

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Thermal and humid environment of rammed-earth dwellings in Northwest Sichuan

Cited by 8 publications

References 23 publications

Thermal Comfort and Microclimate in Indoor Spaces of Low-rise Residential Buildings in Dry Tropical Climate

Thermal Comfort and Microclimate in Indoor Spaces of Low-rise Residential Buildings in Dry Tropical Climate

Thermal and Humidity Performance Test of Rammed-Earth Dwellings in Northwest Sichuan during Summer and Winter

Numerical Simulation of Heat and Mass Transfer in Sludge Low-Temperature Drying Process

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