Experimental study on water evaporation from sand using environmental chamber

Song, Weikang; Cui, Yu‐Jun; Tang, Anh Minh; Ding, Wenqi; Tran, Thanh Danh

doi:10.1139/cgj-2013-0155

Cited by 67 publications

(29 citation statements)

References 32 publications

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“…Abundant research work has been implemented to study the evaporation process and the corresponding soil response (Fisher et al, 1923;Wilson et al, 1994Wilson et al, , 1997Shimojima et al, 1996;Diaz et al, 2005;Tang et al, 2011a;Song et al, 2014). It has been stated that both exterior factors (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The interior factors are physical and chemical soil parameters, among which are soil permeability, composition, particle size, salinity and thickness, etc. To author's knowledge, much research has been performed on the effects of atmospheric conditions on evaporation (An et al, 2017;Davarzani et al, 2014;Song et al, 2014;Wilson et al, 1994). However, the effect of soil nature on the evaporation process still requires further investigation due to soil complexity, in spite of the numerous assessment that have been made in terms of the influence of soil characteristics on evaporation (Diaz et al, 2005;Shahraeeni et al, 2012;Yuan et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of moisture evaporation process with different soil characteristics

Tang

et al. 2019

JGS Special Publication

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Evaporation of water from soils induces soil cracking, salinization and degradation, especially in arid irrigated areas. The factors that influence water evaporation from soil includes external type, referring to atmospheric conditions and interior type, covering surficial soil characteristics and water content conditions. In spite of the numerous assessment that have been made on the influence of atmospheric conditions and soil characteristics on evaporation of moisture from soils, many aspects still require further investigation due to soil complexity. In this study, laboratory-based evaporation tests were performed on clayey soil and three kinds of quartzite sands of different particle sizes using the same environmental conditions. Three different tests were performed on slurry samples to evaluate the effects of soil characteristics on its free water evaporation process at room temperature (20-22°C) and relative humidity (50 ± 2%) conditions: soil thickness, particle size of mixing sand and mixing sands ratio. It is shown that larger soil sample thicknesses accelerate water evaporation rate and extend the constant evaporation rate stage. Higher sand mix proportions lead to larger evaporation area and soil porosity, allowing higher evaporation rate and longer duration of the first stage and the starting of the falling rate stage at lower water content. However, soil particle size was not found to have a significant impact on evaporation rate on per unit weight of added soil basis.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study of moisture evaporation process with different soil characteristics

Tang

et al. 2019

JGS Special Publication

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“…Furthermore, in the first meters of depth below the ground surface, when groundwater flow is not present, conduction is the dominant process governing heat transfer in soil. This process is driven by temperature gradients and depends mainly on thermal conductivity, in turn, a property strictly related to water content (Gonzales et al, 2012;Leong et al, 1998;Schön J.H., 2011;Song et al, 2014). Therefore, a better knowledge of the relationship between thermal conductivity and water content is required for understanding the VSG systems behaviour in saturated and unsaturated conditions.…”

Section: Introductionmentioning

confidence: 99%

Thermal properties variations in unconsolidated material for very shallow geothermal application (ITER project)

Sipio¹,

Bertermann²

2018

International Agrophysics

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In engineering, agricultural and meteorological project design, sediment thermal properties are highly important parameters, and thermal conductivity plays a fundamental role when dimensioning ground heat exchangers, especially in very shallow geothermal systems. Herein, the first 2 m of depth from surface is of critical importance. However, the heat transfer determination in unconsolidated material is difficult to estimate, as it depends on several factors, including particle size, bulk density, water content, mineralogy composition and ground temperature. The performance of a very shallow geothermal system, as a horizontal collector or heat basket, is strongly correlated to the type of sediment at disposal and rapidly decreases in the case of dry-unsaturated conditions. The available experimental data are often scattered, incomplete and do not fully support thermo-active ground structure modeling. The ITER project, funded by the European Union, contributes to a better knowledge of the relationship between thermal conductivity and water content, required for understanding the very shallow geothermal systems behaviour in saturated and unsaturated conditions. So as to enhance the performance of horizontal geothermal heat exchangers, thermally enhanced backfilling material were tested in the laboratory, and an overview of physical-thermal properties variations under several moisture and load conditions for different mixtures of natural material was here presented.

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“…[38][39][40][41]. Diurnal, monthly and seasonal variations of climatic data, especially air temperature and rainfall, can affect the moisture transfer in soils.…”

Section: Introductionmentioning

confidence: 99%

Factors Influencing the Thermal Efficiency of Horizontal Ground Heat Exchangers

Sipio

Bertermann

2017

Energies

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Abstract:The performance of very shallow geothermal systems (VSGs), interesting the first 2 m of depth from ground level, is strongly correlated to the kind of sediment locally available. These systems are attractive due to their low installation costs, less legal constraints, easy maintenance and possibility for technical improvements. The Improving Thermal Efficiency of horizontal ground heat exchangers Project (ITER) aims to understand how to enhance the heat transfer of the sediments surrounding the pipes and to depict the VSGs behavior in extreme thermal situations. In this regard, five helices were installed horizontally surrounded by five different backfilling materials under the same climatic conditions and tested under different operation modes. The field test monitoring concerned: (a) monthly measurement of thermal conductivity and moisture content on surface; (b) continuous recording of air and ground temperature (inside and outside each helix); (c) continuous climatological and ground volumetric water content (VWC) data acquisition. The interactions between soils, VSGs, environment and climate are presented here, focusing on the differences and similarities between the behavior of the helix and surrounding material, especially when the heat pump is running in heating mode for a very long time, forcing the ground temperature to drop below 0 • C.

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Experimental study on water evaporation from sand using environmental chamber

Cited by 67 publications

References 32 publications

Experimental study of moisture evaporation process with different soil characteristics

Experimental study of moisture evaporation process with different soil characteristics

Thermal properties variations in unconsolidated material for very shallow geothermal application (ITER project)

Factors Influencing the Thermal Efficiency of Horizontal Ground Heat Exchangers

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