Experimental study on the thermal conductivity of aerogel-enhanced insulating materials under various hygrothermal environments

Yang, Wen‐Jei; Liu, Jiaping; Wang, Yingying; Gao, Sijia

doi:10.1016/j.enbuild.2019.109583

Cited by 45 publications

(5 citation statements)

References 47 publications

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“…Generally speaking, the resistivity of ordinary cement-based composite materials is in the range of 104∼107 Ω·m under normal conditions, which is a kind of nonconductive material. Carbon fiber materials are widely used in various fields due to their electrical conductivity, thermal conductivity, controllability of surface morphology, low density, and low quality; this is also the main reason why it can become an ideal reinforcing fiber material [ 3 ]. However, due to the frequent agglomeration of carbon fiber materials, it is difficult to disperse in cement-based composite materials, studies have shown that adding dispersants or using ultrasonic technology can make them have better dispersibility in solution.…”

Section: Introductionmentioning

confidence: 99%

Application of Cement-Based Carbon Fiber Material in Construction of Building Durability

Li¹,

Li²,

Zhang³

et al. 2022

International Journal of Analytical Chemistry

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In order to solve the problem of drying shrinkage of cement-based carbon fiber materials in the early stage of hardening, the author proposes the application of cement-based carbon fiber materials in the construction of building durability. The author uses a self-designed fast ring test method to test and study the drying shrinkage performance of cement-based carbon fiber materials in the early stage of hardening. The results showed that the addition of MP-I and MP-II fibers, which can significantly reduce shrinkage cracking in plastic concrete, has little effect on preventing the shrinkage and cracking of concrete in the early stage of hardening. Mixed with a certain amount of steel fiber, carbon fiber, MH-I, and MPH-I hardened anticrack fiber, all have a better effect on preventing early water loss and drying shrinkage of hardening. The MH-I and MPH-I hardening anticracking fibers have an economical and feasible dosage, and the early water loss shrinkage and crack reduction rates of concrete hardening are 71.2% and 79.0%, respectively. MH-I fibers have no anticracking effect in the plastic stage and are only suitable for shrinkage and crack prevention of concrete in the early stage of hardening, while MPH-I hardened anticrack fibers have a 100% crack-reducing effect in the plastic stage, it is an engineering fiber material that can simultaneously prevent the plasticity and early hardening of concrete from shrinkage and cracking. The application of MPH-I hardened anticrack fiber is of great significance to improve the quality of structural engineering.

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Section: Introductionmentioning

confidence: 99%

Application of Cement-Based Carbon Fiber Material in Construction of Building Durability

Li¹,

Li²,

Zhang³

et al. 2022

International Journal of Analytical Chemistry

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“…However, traditional thermal insulation materials have become the preferred materials in many building and thermal energy storage applications because of their low thermal conductivity and low cost [23]. However, with the continuous research on building thermal insulation materials, researchers have recently proposed a new type of building super thermal insulation material-aerogel-enhanced HGM, which is also taken as the research object in this study [24]. Thermal conductivity can be affected by temperature, water content and humidity according to existing literature and published studies [25].…”

Section: Test Materialsmentioning

confidence: 99%

The Effect of Relative Humidity Dependent Thermal Conductivity on Building Insulation Layer Thickness Optimization

Yang

Zhang

et al. 2022

Buildings

Self Cite

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Optimization of insulation layer thickness is a significant factor in energy-efficient building design. Accurate determination of the thickness of the insulation layer will contribute to building energy conservation. In this study, ten typical cities in five thermal zones were selected, and the external thermal insulation of a typical residential building was taken as the research object. Using the degree day method and the economic model of full life cycle cost analysis, the optimal thickness of seven kinds of building insulation materials under absolute dry conditions, the lowest humidity and the highest humidity of the monthly average of the annual daily average were obtained. In addition, the carbon emission, energy saving and recovery period of materials under different working conditions were further obtained through numerical calculation. The results show that the optimum thickness of seven building insulation materials in ten typical cities under three working conditions is 18.21–346.05 mm. Their carbon emission change rate is between −2.7% and 38.6%, energy saving change rate is between −0.4% and 18.4%, and the payback period growth is within 1.5 years. Among them, polystyrene foam is the material least affected by humidity. It is recommended to be the main building insulation material in high humidity areas.

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“…The aerogel insulation coating is evenly coated on the outer side of the ice valve tube and processed to the required thickness after derusting and cleaning the ice valve tube. After that, the waterproof and protective treatments are carried out because the thermal conductivity of the aerogel insulation coating is sensitive to humidity [27].…”

Section: Experimental Setup and Stepsmentioning

confidence: 99%

Experimental Study on the Insulation Layer Thickness of a Novel Ice Coring Device in Loose Sandstone-Type Uranium Deposits

Huang

Peng

et al. 2021

Energies

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The target strata of sandstone-type uranium deposits are usually located in the fragile and loose strata, which makes it difficult to obtain core samples; consequently, a novel ice coring device for loose sandstone-type uranium deposits is proposed to solve this problem. Experiments proved that the artificial sample can replace the natural sample, and the coring method has high reliability. Ensuring the allegro formation of an ice valve with a given cold source is critical for this coring system, and reducing the loss of cold energy with help of insulation layer is one of the methods to speed up the formation of ice valve. Since the diameter of the drill tool is limited by its working scenario, the thickness of insulation layer is limited to ensure the size of core. Therefore, this paper conducted laboratory experiments of the insulation layer with different thicknesses to study the effect of the insulation layer on the formation of the sand–ice valve. Results show that the insulation layer can reduce the loss of cold energy during the freezing process and significantly affect the formation time of the sand–ice valve. When the thickness of the aerogel insulation layer is 2 mm, the freezing time is 44% shorter than that without insulation layer. According to the tests, the novel ice coring device is expected to solve the coring problem in loose sandstone-type uranium deposits.

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Experimental study on the thermal conductivity of aerogel-enhanced insulating materials under various hygrothermal environments

Cited by 45 publications

References 47 publications

Application of Cement-Based Carbon Fiber Material in Construction of Building Durability

Application of Cement-Based Carbon Fiber Material in Construction of Building Durability

The Effect of Relative Humidity Dependent Thermal Conductivity on Building Insulation Layer Thickness Optimization

Experimental Study on the Insulation Layer Thickness of a Novel Ice Coring Device in Loose Sandstone-Type Uranium Deposits

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