Numerical Simulation Analysis on Lengthwise Graphitization Furnace Co-Production Silicon Carbide

2012 ◽  
Vol 557-559 ◽  
pp. 835-838
Author(s):  
Yong Gang Li ◽  
Yang Dong Hu ◽  
Lian Ying Wu ◽  
Chun Li Yu
Keyword(s):  
Thermal Conductivity ◽  
Silicon Carbide ◽  
Energy Consumption ◽  
Percolation Theory ◽  
Thermal Conductivity Coefficient ◽  
Simulation Analysis ◽  
Insulation Material ◽  
Thermal Coefficient ◽  
Finite Element Software ◽  
Graphitization Furnace

The effective thermal conductivity coefficient of silicon carbide (SiC) synthesis materials and graphitization furnace insulation material were obtained by applying heat percolation theory and thermal coefficient equation of various layer-compositors. This paper proposed a further numerical analysis on the temperature distribution of SiC furnace, lengthwise graphitization (LWG) furnace and Co-production furnace by open source finite element software FEPG. The results show that the Co-production furnace can produce SiC after finishing graphitization production and Co-production furnace’s energy consumption subtract energy consumption of LWG furnace, SiC production energy consumption of Co-production furnace is half and SiC yield of Co-production furnace is 57-73 percent of same type of SiC furnace. Besides, applying Co-production process could reduce the exhaust of whole LWG furnace.

Numerical Simulation Analysis of Temperature Field on Silicon Carbide Synthesis Furnace

2011 ◽  
Vol 686 ◽  
pp. 494-500 ◽  
Author(s):  
Yong Gang Li ◽  
Yang Dong Hu ◽  
Lian Ying Wu ◽  
Hong Li
Keyword(s):  
Silicon Carbide ◽  
Finite Element ◽  
Temperature Field ◽  
Simulation Analysis ◽  
Heat Transfer Process ◽  
Thermal Coefficient ◽  
Finite Element Software ◽  
Save Energy ◽  
Dynamic Heat Transfer ◽  
Silicone Carbide

Based on heat percolation theory and thermal coefficient equation of various layer-compositors, the effective thermal conductivity of silicone carbide（SiC）synthetic material was obtained, and the effective heat capacity under the complicated thermal effect in the process of raising temperature figured out in the present investigation. Based on the experimental results and using the finite element numerical model of nonlinear dynamic heat transfer process, the temperature field in SiC synthesis furnace was simulated by open source finite element software-FECsoft. And the dynamic laws of temperature distribution and thermal gradient of the furnace, the relation between the furnace core’s temperature and the energy consumption and output were obtained. Based on the above analysis, some measures to save energy and increasing output of the silicon carbide synthesis furnace were proposed in this paper.

scholarly journals Analysis of Specificity of ecological insulation material thermal Parameters

2018 ◽  
Vol 251 ◽  
pp. 01011 ◽  
Author(s):  
Baiba Gaujena ◽  
Jelena Tihana ◽  
Anatolijs Borodinecs ◽  
Vladislavs Agapovs
Keyword(s):  
Thermal Conductivity ◽  
Water Absorption ◽  
Thermal Conductivity Coefficient ◽  
Insulation Material ◽  
Drying Process ◽  
Hemp Fiber ◽  
Characteristics Method ◽  
Quality Water ◽  
Absorption Thickness

This paper is devoted to analysis of insulation materials quality and characteristics, method for the determination of thermal conductivity coefficient and the influence of various factors on the thermal conductivity coefficient. The paper summarizes the estimated process consumption of thermal energy. The research is defined experimental hemp fiber-sheaves insulation plates manufactured in Latvia further specified actual parameter and quality water absorption; thickness changes; drying process; thermal conductivity coefficient; thermal conductivity coefficient depending from moisture. Research is made using experimental hemp fiber-sheaves insulation pattern manufactured in Latvia – plates in size 300 x 300 mm. In research totally are used three hemp fiber-sheaves pattern series with different substance and extrusion modes. Each series consist from four plate with different thickness. As result of research is determined hemp fiber-sheaves insulation pattern Water absorption, dynamics of Drying process, Thickness changes, Thermal conductivity coefficient and Thermal conductivity coefficient depending from moisture.

Performance properties of vacuum insulation panels produced with various filling materials

2014 ◽  
Vol 21 (4) ◽  
pp. 521-527 ◽  
Author(s):  
Metin Davraz ◽  
Hilmi C. Bayrakci
Keyword(s):  
Thermal Conductivity ◽  
Silicon Carbide ◽  
Glass Fiber ◽  
Fumed Silica ◽  
Production Costs ◽  
Unit Weight ◽  
Insulation Material ◽  
Core Samples ◽  
Vacuum Insulation ◽  
Precipitated Silica

AbstractVacuum insulation panel (VIP) is known to be the most effective insulation material. However, the usage areas of VIPs are restricted because of their high production costs. The core of VIP is the most important item affecting the cost of VIP. In this study, to obtain VIPs, which are provided with minimum thermal conductivity resistance value (R=5 m2 K/mW), was aimed for the optimal thickness of the panel (<40 mm). Therefore, 14 different core samples of VIP were produced by using various types of powders (fumed silica, precipitated silica, perlite, and diatomite), opacifiers (silicon carbide, carbon black, and titanium dioxide), and fibers (glass fiber, organic fiber, and cellulosic fiber). By using appropriate test methods, the physical properties of core samples such as unit weight, porosity, mass per volume and mechanical properties, their uniaxial compressive strength, tensile strength, and dimensional stability and also thermal conductivity coefficient in vacuum were determined. Results were compared with values of reference materials. The most appropriate compression pressure used in the manufacture of core sample was 27.5 kN. In addition, taking into account the benefit-cost relationship, the results of this study showed that the mix of fumed silica and precipitated silica (powder material), silicon carbide (opacifier), and glass fiber (fiber) was determined as the most suitable raw materials.

Research on Temperature Field about Cutting Area in Plunge Milling Ti Alloy Based on Finite Element

2010 ◽  
Vol 102-104 ◽  
pp. 630-633
Author(s):  
Xu Da Qin ◽  
Wei Cheng Liu ◽  
Hao Jia ◽  
Xiao Lai Ji
Keyword(s):  
Thermal Conductivity ◽  
Finite Element ◽  
Temperature Field ◽  
Thermal Conductivity Coefficient ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Ti Alloy ◽  
Plunge Milling ◽  
Finite Element Software

Because of the small thermal conductivity coefficient of Ti alloy, the heat cannot disperse timely and accumulate seriously when plunge milling Ti alloy. If the cutting parameters can not be controlled well, the phenomenon of sticking will happen easily. According to the simulation and analysis of temperature field by using finite element software ABAQUS, the influence on cutting speed and feed for the Distributing of Temperature Field about Cutting Area in Plunge Milling Ti Alloy is acquired.

scholarly journals Defining the thermal conductivity of thermally heterogeneous hollow wall bricks used as elements for increasing the comfort of buildings

2021 ◽  
pp. 64-72
Author(s):  
Krzysztof PAWŁOWSKI ◽  
Maciej NIEDOSTATKIEWICZ
Keyword(s):  
Thermal Conductivity ◽  
Numerical Calculation ◽  
Thermal Conductivity Coefficient ◽  
Heterogeneous Structure ◽  
Insulation Material ◽  
Thermal Requirements ◽  
Stationary Approach ◽  
Calculation Analysis ◽  
Structural Layer ◽  
Hollow Bricks

The article presents numerical calculation analysis in the scope of determining thermal conductivity coefficient λeq [W/(m·K)] of thermally heterogeneous hollow bricks of thermally heterogeneous structure (a combination of structural material with thermal insulation material). Numerical calculations were conducted by means of professional software TRISCO-KOBRU 86, serving thermal circulation analysis in a 2D field in stationary approach. The analyzed hollow wall bricks may be used, for instance, as a structural layer of layered outer walls of a building. In the article also the results of the Uc thermal conductivity coefficient calculations for double-layer walls with the use of the analyzed hollow wall bricks are presented in regard to thermal requirements.

Study on Preparation and Properties of Cement-Based Foamed Lightweight Thermal Insulation Material

2011 ◽  
Vol 306-307 ◽  
pp. 994-997
Author(s):  
Cong Cong Jiang ◽  
Guo Zhong Li ◽  
Shui Zhang
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Fly Ash ◽  
Thermal Insulation ◽  
Thermal Conductivity Coefficient ◽  
Steel Slag ◽  
Activation Mechanism ◽  
Dry Density ◽  
Insulation Material ◽  
Thermal Insulation Material

A cement-based foamed lightweight thermal insulation material was prepared with cement, industrial waste (fly ash, steel slag) as the main raw materials, by using self-developed composite activator and foaming agent. The influence of foam content on dry density, compressive strength and thermal conductivity coefficient of material was studied, the activation mechanism of composite activator to fly ash and steel slag was discussed. Results showed that, the dry density and compressive strength of material decreased, and thermal conductivity coefficient decreased first and then increased with the increasing foam content.

scholarly journals Research of thermal performance properties of the wall construction products made of materials using heat power engineering waste

2021 ◽  
Vol 274 ◽  
pp. 07001
Author(s):  
Dmitriy Kraynov ◽  
Galina Medvedeva
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Oil And Gas ◽  
Thermal Conductivity Coefficient ◽  
Base Material ◽  
Design Stage ◽  
Industrial Complex ◽  
Insulation Material ◽  
Performance Properties ◽  
Building Product

A technology for the utilization of technogenic waste from the oil and gas industrial complex (sulfur) and ash and slag waste from the combined heat and power plant for the manufacture of thermal insulation material with high strength and performance properties has been developed. A technological scheme is proposed. The optimal parameters and composition of the obtained thermal insulation materials have been determined. A numerical method for determining the thermal conductivity coefficient of a building product based on the calculation of a stationary temperature field is considered. The dependence of the thermal conductivity coefficient of a block on the value of the thermal conductivity coefficients of the base material and filler is obtained. The efficiency of block insulation has been determined. This method can be used at the design stage of wall products, varying their overall dimensions, the geometry of the slots and also using various thermal insulating materials as a void filler.

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.

High thermal conductivity of pure dense SiC ceramics prepared via HTPVT

2019 ◽  
Vol 12 (03) ◽  
pp. 1950032 ◽  
Author(s):  
Yuchen Deng ◽  
Yaming Zhang ◽  
Nanlong Zhang ◽  
Qiang Zhi ◽  
Bo Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Silicon Carbide ◽  
Grain Size ◽  
Phase Composition ◽  
Room Temperature ◽  
Vapor Transport ◽  
Physical Vapor Transport ◽  
Growth Substrate ◽  
Sic Ceramics ◽  
Evolution Of Microstructure

Pure dense silicon carbide (SiC) ceramics were obtained via the high-temperature physical vapor transport (HTPVT) method using graphite paper as the growth substrate. The phase composition, the evolution of microstructure, the thermal diffusivity and thermal conductivity at RT to 200∘C were investigated. The obtained samples had a relative density of higher than 98.7% and a large grain size of 1[Formula: see text]mm, the samples also had a room-temperature thermal conductivity of [Formula: see text] and with the temperature increased to 200∘C, the thermal conductivity still maintained at [Formula: see text].

scholarly journals Thermal, Physical and Mechanical Performance of Orange Peel Boards: A New Recycled Material for Building Application

2021 ◽  
Vol 13 (14) ◽  
pp. 7945
Author(s):  
Matteo Vitale ◽  
María del Mar Barbero-Barrera ◽  
Santi Maria Cascone
Keyword(s):  
Thermal Conductivity ◽  
Bending Strength ◽  
Mechanical Performance ◽  
Orange Peel ◽  
Insulation Material ◽  
Orange Peels ◽  
Orange Fruit ◽  
Citrus Waste ◽  
Absorption Thickness ◽  
Loss Of Strength

More than 124 million tons of oranges are consumed in the world annually. Transformation of orange fruit generates a huge quantity of waste, largely composed of peels. Some attempts to reuse by-products derived from citrus waste have been proposed for energy production, nutrient source or pharmaceutical, food and cosmetic industries. However, their use in the building sector had not been researched. In this study, orange peels, in five different ratios, from 100% of wet peels to 75% and from 0% of dry peels to 25%, were submitted to a thermo-compression procedure. They were evaluated according to their physical (bulk density, water absorption, thickness swelling, surface soundness and thermal conductivity) and mechanical properties (bending strength and modulus of elasticity). The results showed that orange peels can be used as thermal insulation material. The addition of dried peels makes the structure of the board heterogeneous and thus increases its porosity and causes the loss of strength. Hence, the board with the sole use of wet peel, whose thermal conductivity is 0.065 W/mK while flexural strength is 0.09 MPa, is recommended.

Sign in / Sign up

Export Citation Format

Share Document