Experimental Investigation on the Thermal Insulation Properties of Eic-Cellulose

2014 ◽  
Vol 554 ◽  
pp. 322-326 ◽  
Author(s):  
Wuryanti Sri ◽  
Suhardjo Poertadji ◽  
Bambang Soegijono ◽  
Nasution Henry
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Experimental Investigation ◽  
Thermal Insulation ◽  
Cellulose Fibers ◽  
Extraction Process ◽  
Thermal Capacity ◽  
Insulation Material ◽  
Low Thermal Conductivity ◽  
Thermal Conductivities

The material with low thermal conductivity means it has a high insulating capability for reducing heat transfer. One of materials for insulation is cellulose. This study presents a insulation material of cellulose made from reeds imperata cylindrical type with the extraction process. The extraction of cellulose fibers to form a sheet by adding 3.5% Na-CMC (Sodium Cellulose Carboksil Metyl). The process of forming the sheet uses blender for 30 minutes, 45 minutes, and 60 minutes. Furthermore, each mixture are put into the oven with temperature of 40°C for 36 hours. There are three parameters will be investigated, i.e. thermal conductivity, density and thermal capacity. The results showed that the lowest and the highest of thermal conductivities were 0.22 W/m K and a maximum 0.36 W/m K, respectively.

Analysis of Thermal Insulation Material on Building Exterior Wall

2017 ◽  
Vol 873 ◽  
pp. 153-157 ◽  
Author(s):  
Jia Jiu Diao ◽  
Xin Qin Liao ◽  
Can Fa Diao
Keyword(s):  
Thermal Conductivity ◽  
Flame Retardant ◽  
Thermal Insulation ◽  
Insulation Material ◽  
Low Thermal Conductivity ◽  
Insulation Materials ◽  
Existing Problems ◽  
Comprehensive Properties ◽  
First Choice ◽  
Insulation Performance

The use of performance, application status and existing problems of organic and inorganic thermal insulation materials, which are commonly used in the external walls of the building, are described in detail in this paper. Organic thermal insulation materials with low thermal conductivity, good thermal insulation performance, but with the flammable, low fire rating, poor safety, then it needing for flame retardant treatment. However, Inorganic thermal insulation materials with flame retardant, high fire rating, good safety performance, but poor thermal insulation properties than the organic insulation materials, so it needs to develop a low thermal conductivity of inorganic insulation materials.In the end, we pointed out that the inorganic insulation materials with low thermal conductivity and excellent comprehensive properties are expected to be the first choice for building thermal insulation materials.

scholarly journals Experimental and CFD Investigation on the Application for Aerogel Insulation in Buildings

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3310
Author(s):  
Santu Golder ◽  
Ramadas Narayanan ◽  
Md. Rashed Hossain ◽  
Mohammad Rofiqul Islam
Keyword(s):  
Thermal Conductivity ◽  
Energy Consumption ◽  
Thermal Insulation ◽  
Cfd Simulation ◽  
Extended Period ◽  
Building Energy ◽  
Insulation Material ◽  
Low Thermal Conductivity ◽  
Insulation Materials ◽  
Temperature Decay

Reducing building energy consumption is a significant challenge and is one of the most important research areas worldwide. Insulation will help to keep the building’s desired temperature by reducing the heat flow. Additionally, proper insulation can provide an extended period of comfort, leading to reduced building energy requirements. Encapsulated air is the major aspect of most thermal insulation materials. Low thermal conductivity is a good characteristic of thermal insulation materials. Aerogel has low thermal conductivity, so it is suitable for glazing and insulation purposes. This research paper investigates the effectiveness of aerogel as an insulation material in buildings by incorporating a translucent aerogel-glazing system in the window and aerogel insulation in the wall of a building. Experimental investigation of a 10 mm thick aerogel blanket surrounded box was conducted to assess its performance. Additionally, a CFD simulation was conducted, and the results of temperature degradation for the wall showed good agreement with experimental results. Additionally, the CFD simulation of temperature decay was compared between the aerogel-glazed window and argon-glazed window. It was found that the aerogel-glazed window has slower temperature decay compared to the argon-glazed window. The results showed that integrating aerogel in the glazing system and wall insulation in a building has the potential to reduce the building’s energy consumption. Moreover, a numeric simulation was conducted, and showed that the building’s annual energy consumption is reduced by 6% with the use of aerogel insulation compared to fiberglass.

scholarly journals Analysis of the effectiveness of thermal insulation of a multi-layer reinforced concrete slab using layer of concrete with low thermal conductivity under the climatic conditions of Vietnam

2018 ◽  
Vol 251 ◽  
pp. 04026 ◽  
Author(s):  
Vu Dinh Tho ◽  
Elena Korol ◽  
Nguyen Huy Hoang
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Reinforced Concrete ◽  
Thermal Insulation ◽  
Concrete Slab ◽  
Climatic Conditions ◽  
Concrete Slabs ◽  
Reinforced Concrete Slab ◽  
Low Thermal Conductivity ◽  
Reinforced Concrete Slabs

Multi-layer reinforced concrete slabs with thermal insulation materials are widely used in practice all over the world. In Vietnam, in order to apply modern construction of multi-layer structures with an inner layer of low thermal conductivity concrete into practice, it is necessary to conduct numerical researches on the peculiarities of the country climatic conditions country. In this paper, the authors analyze the heat transfer in multilayer reinforced concrete slabs’ roof under the climatic conditions of Hanoi (Vietnam) using finite element method with computer simulation. The object of the study is the insulating capacity of multilayer reinforced concrete roofs under the influence of changes in the temperature of the outer surface of the structure of the buildings’ roof. The research methods are based on the numerical simulation of heat transfer from the outer to the inner surface of the building roof. From the results obtained, compared to the traditional design solution, multilayer reinforced concrete slab appears to have more advantages, and these advantages are available with the use of heat-insulating material made of polystyrene concrete. These scientific researches enable to choose the rational roof design in Vietnam, which satisfies the demand to reduce influence of temperature.

scholarly journals Biobased foams for thermal insulation: material selection, processing, modelling, and performance

RSC Advances ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 4375-4394
Author(s):  
Rebecca Mort ◽  
Keith Vorst ◽  
Greg Curtzwiler ◽  
Shan Jiang
Keyword(s):  
Thermal Conductivity ◽  
Physical Properties ◽  
Thermal Insulation ◽  
Material Selection ◽  
Insulation Material ◽  
Materials Selection ◽  
Thermal Insulation Material ◽  
Low Thermal Conductivity ◽  
And Performance

This review outlines the progress in biobased foams with a focus on low thermal conductivity. It introduces materials selection and processing, compares performance, examines modelling of physical properties, and discusses challenges in applying models to real systems.

Study on transient heat transfer through multilayer thermal insulation: Numerical analysis and experimental investigation

2010 ◽  
Vol 3 (4) ◽  
pp. 279-294 ◽  
Author(s):  
Lazaros Elias Mavromatidis ◽  
Pierre Michel ◽  
Mohamed El Mankibi ◽  
Mat Santamouris
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Numerical Analysis ◽  
Thermal Insulation ◽  
Transient Heat Transfer

Cryogenic thermal insulating and mechanical properties of rigid polyurethane foams blown with hydrofluoroolefin: Effect of perfluoroalkane

2021 ◽  
pp. 0021955X2110626
Author(s):  
Tae Seok Kim ◽  
Yeongbeom Lee ◽  
Chul Hyun Hwang ◽  
Kwang Ho Song ◽  
Woo Nyon Kim
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Thermal Stability ◽  
Cell Size ◽  
Thermal Insulation ◽  
Coefficient Of Thermal Expansion ◽  
Lower Surface ◽  
Polyurethane Foams ◽  
Insulation Material ◽  
Pu Foams

The effect of perfluoroalkane (PFA) on the morphology, thermal conductivity, mechanical properties and thermal stability of rigid polyurethane (PU) foams was investigated under ambient and cryogenic conditions. The PU foams were blown with hydrofluorolefin. Morphological results showed that the minimum cell size (153 μm) was observed when the PFA content was 1.0 part per hundred polyols by weight (php). This was due to the lower surface tension of the mixed polyol solution when the PFA content was 1.0 php. The thermal conductivity of PU foams measured under ambient (0.0215 W/mK) and cryogenic (0.0179 W/mK at −100°C) conditions reached a minimum when the PFA content was 1.0 php. The low value of thermal conductivity was a result of the small cell size of the foams. The above results suggest that PFA acted as a nucleating agent to enhanced the thermal insulation properties of PU foams. The compressive and shear strengths of the PU foams did not appreciably change with PFA content at either −170°C or 20°C. However, it shows that the mechanical strengths at −170°C and 20°C for the PU foams meet the specification. Coefficient of thermal expansion, and thermal shock tests of the PU foams showed enough thermal stability for the LNG carrier’s operation temperature. Therefore, it is suggested that the PU foams blown by HFO with the PFA addition can be used as a thermal insulation material for a conventional LNG carrier.

scholarly journals Experimental investigation of rockwool insulation hygrothermal properties related to material structure

2015 ◽  
Vol 19 (3) ◽  
pp. 923-928 ◽  
Author(s):  
Maja Djurovic-Petrovic
Keyword(s):  
Thermal Conductivity ◽  
Experimental Investigation ◽  
Sorption Properties ◽  
Material Structure ◽  
Insulation Material ◽  
Wide Range ◽  
Two Samples

The hygrothermal properties related to rockwool insulation material structure with different additives are presented using rockwool insulation products obtained from row material of southern Serbia (Vranje region) in the wide range of reference temperatures (10?C to 70?C). The hygrothermal properties of basic sample (without additives) are compared to two samples with different additives for two sets of rockwool insulation samples namely: light-soft-panels (LSP) with density of 50 kg/m3, and middle-weight-panels (MWP) with density of 80 kg/m3. It is shown that there is significant (approximately 10%) improvement of thermal conductivity for additives based on zeolite. Also, correlation of thermal conductivity and sorption properties of selected samples are presented.

scholarly journals Innovative composite on the basis of an aerogel mat with an epoxy resin modified with PET waste and PCM

2018 ◽  
Vol 44 ◽  
pp. 00031 ◽  
Author(s):  
Bernardeta Dębska ◽  
Lech Lichołai ◽  
Jerzy Szyszka
Keyword(s):  
Epoxy Resin ◽  
Thermal Insulation ◽  
Thermal Capacity ◽  
Mineral Wool ◽  
Insulation Material ◽  
Composite Sandwich ◽  
Poly Ethylene Terephthalate ◽  
Large Heat ◽  
Poly Ethylene ◽  
Encapsulated Phase Change Material

The article presents a patent proposition of a composite – sandwich panel made of aerogel mat and a composition of encapsulated phase-change material PCM and epoxy resin modified by glycolysis based on poly(ethylene terephthalate) waste. A multifunctional thermal insulation material with a large heat capacity was obtained. This ability makes it possible to limit the temperature fluctuation in the space encased with the composite. In addition, thanks to the use of aerogel mat, which is characterized by much higher thermal insulation than commonly available materials, it is possible to achieve the assumed thermal resistance using more than two times lower thickness of insulation. The combination of aerogel and resin-PCM makes it possible to give the material virtually any shape. After the hardening process is completed, it has incomparably greater tensile, bending and compression strengths than Styrofoam and mineral wool. These features predispose it for use in situations where high thermal insulation is required while maintaining a low thickness of insulation material and a large thermal capacity of the housing material is indicated, e.g. thin divisions used in passive buildings, window joinery elements, engine compartments and cabin components in vehicles, household appliances etc.

Unused Plant Waste and Thermal Insulation Composition Boards on their Basis

2021 ◽  
Vol 887 ◽  
pp. 480-486
Author(s):  
T.N. Vachnina ◽  
I.V. Susoeva ◽  
A.A. Titunin ◽  
S.V. Tsybakin
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Wood Fiber ◽  
Mineral Wool ◽  
Wood Waste ◽  
Insulation Material ◽  
Plant Fibers ◽  
Coefficient Of Thermal Conductivity ◽  
Plant Waste ◽  
Technology Of Production

Many plant wastes are not currently used in production, they are disposed of in landfills or incinerated. The aim of this study is to develop a composite thermal insulation material from unused spinning waste of flax and cotton fibers and soft wood waste. Samples of thermal insulation materials from plant waste were made by drying using the technology of production of soft wood fiber boards. For composite board defined physico-mechanical characteristics and thermal conductivity. The experiment was carried out according to a second-order plan, regression models of the dependences of the material indicators on the proportion of the binder additive, drying temperature and the proportion of wood waste additives were developed. The study showed that composites from unused spinning waste of plant fibers and soft wood waste have the necessary strength under static bending, the swelling in thickness after staying in water is much lower in comparison with the performance of boards from other plant fillers. The coefficient of thermal conductivity of the boards is comparable with the indicator for mineral wool boards.

scholarly journals Continuous, Strong, Porous Silk Firoin-Based Aerogel Fibers toward Textile Thermal Insulation

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1899 ◽  
Author(s):  
Haiwei Yang ◽  
Zongqian Wang ◽  
Zhi Liu ◽  
Huan Cheng ◽  
Changlong Li
Keyword(s):  
Heat Transfer ◽  
Thermal Insulation ◽  
Hollow Fiber ◽  
High Performance ◽  
Large Scale ◽  
Low Density ◽  
Potential Candidate ◽  
Scale Production ◽  
Insulation Material ◽  
High Porosity

Aerogel fiber, with the characteristics of ultra-low density, ultra-high porosity, and high specific surface area, is the most potential candidate for manufacturing wearable thermal insulation material. However, aerogel fibers generally show weak mechanical properties and complex preparation processes. Herein, through firstly preparing a cellulose acetate/polyacrylic acid (CA/PAA) hollow fiber using coaxial wet-spinning followed by injecting the silk fibroin (SF) solution into the hollow fiber, the CA/PAA-wrapped SF aerogel fibers toward textile thermal insulation were successfully constructed after freeze-drying. The sheath (CA/PAA hollow fiber) possesses a multiscale porous structure, including micropores (11.37 ± 4.01 μm), sub-micron pores (217.47 ± 46.16 nm), as well as nanopores on the inner (44.00 ± 21.65 nm) and outer (36.43 ± 17.55 nm) surfaces, which is crucial to the formation of a SF aerogel core. Furthermore, the porous CA/PAA-wrapped SF aerogel fibers have many advantages, such as low density (0.21 g/cm3), high porosity (86%), high strength at break (2.6 ± 0.4 MPa), as well as potential continuous and large-scale production. The delicate structure of multiscale porous sheath and ultra-low-density SF aerogel core synergistically inhibit air circulation and limit convective heat transfer. Meanwhile, the high porosity of aerogel fibers weakens heat transfer and the SF aerogel cellular walls prevent infrared radiation. The results show that the mat composed of these aerogel fibers exhibits excellent thermal insulating properties with a wide working temperature from −20 to 100 °C. Therefore, this SF-based aerogel fiber can be considered as a practical option for high performance thermal insulation.

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