Performance Test and Research of Ceramic Fiberboard

2014 ◽  
Vol 488-489 ◽  
pp. 36-39
Author(s):  
Ru Ji ◽  
Xi Dong Wang ◽  
Zuo Tai Zhang ◽  
Li Li Liu
Keyword(s):  
Thermal Conductivity ◽  
Moisture Content ◽  
Bulk Density ◽  
Effective Thermal Conductivity ◽  
Performance Test ◽  
Influence Factors ◽  
Thermal Capacity ◽  
Ceramic Fiber ◽  
Insulation Materials ◽  
Coefficient Of Thermal Conductivity

Ceramic fiber has great refractory and insulating ability. The coefficient of thermal conductivity is a significant characteristic of the fiber insulation materials, and shows the material thermal capacity. This paper not only research basic properties of ceramic fiberboard, but also focus on the influence factors of the effective thermal conductivity which include bulk density, temperature and moisture content.

Measuring the Thermo-Technical Parameters of Autoclaved Aerated Concrete

2016 ◽  
Vol 824 ◽  
pp. 100-107 ◽  
Author(s):  
Alena Struhárová
Keyword(s):  
Thermal Conductivity ◽  
Moisture Content ◽  
Physical Properties ◽  
Bulk Density ◽  
Capillary Absorption ◽  
Measuring Device ◽  
Technical Parameters ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Technical Properties

Bulk density and moisture content are factors that significantly affect the physical properties of autoclaved aerated concrete (AAC) including thermal conductivity and other thermo-technical characteristics. This article shows the results of measurements of compressive strength, capillary absorption, water absorption and porosity of AAC (ash on fluidized fly ash) at different bulk density and also the results of thermal conductivity of AAC at different bulk density and variable moisture content of the material. The thermo-technical properties were measured using the Isomet 2104, a portable measuring device. Acquired results demonstrate dependence of physical properties including thermal conductivity of AAC on bulk density and moisture content. The reliability and accuracy of the method of measuring was also shown.

Performance Study of Fiber Reinforced New Lightweight Insulation Materials

2013 ◽  
Vol 662 ◽  
pp. 331-334
Author(s):  
Huan Qi Zhao ◽  
Guo Zhong Li
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Bending Strength ◽  
Raw Materials ◽  
The Self ◽  
Performance Study ◽  
Foaming Agent ◽  
Insulation Materials ◽  
Influencing Mechanism ◽  
Coefficient Of Thermal Conductivity

Cement-based lightweight insulation materials were made. Cement and fly ash are main raw materials. The self-developed composite excitation agent and foaming agent are used. The method of foaming is the physical foaming. The inflection of fiber dosage on the performance of lightweight insulation materials was researched. Its influencing mechanism was discussed. Experiments show that foaming lightweight insulation materials were made with 1.22MPa bending strength, 2.95MPa compressive strength and the 0.072W/mk coefficient of thermal conductivity when the fiber mixing content is 1.2%.

scholarly journals Composites with Excellent Insulation and High Adaptability for Lightweight Envelopes

Energies ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 53 ◽  
Author(s):  
Liang Guo ◽  
Wenbin Tong ◽  
Yexin Xu ◽  
Hong Ye
Keyword(s):  
Thermal Conductivity ◽  
Effective Thermal Conductivity ◽  
Flow Direction ◽  
Base Material ◽  
Core Material ◽  
Insulation Materials ◽  
The Core ◽  
Cross Section Area ◽  
Heat Flow Direction ◽  
Section Area

Lightweight insulation materials are widely used in lightweight buildings, cold-chain vehicles and containers. A kind of insulation composite, which can combine the super insulation of state-of-the-art insulation materials or structures and the machinability or adaptability of traditional insulation materials, was proposed. The composite consists of two components, i.e., polyurethane (PU) foam as the base material and vacuum insulation panel (VIP) or silica aerogel as the core material. The core material is in plate shape and covered with the base material on all sides. The thermal conductivity of the core material is nearly one order lower than that of the base material. The effective thermal conductivity of the insulation composite was explored by simulation. Simulation results show that the effective thermal conductivity of the composite increases with the increase of the thermal conductivity of the core material. The effective thermal conductivities of the composites decrease with the increase of the cross-section area of the core material perpendicular to heat flow direction and the thicknesses of the core material parallel with heat flow direction. These rules can be elucidated by a series-parallel mode thermal resistance network method, which was verified by the measured results. For composite with a VIP as the core material, when the cross-section area and thickness of the VIP are respectively larger than 60% and 21% of the composite, the composite’s effective thermal conductivity can be 50% or less than that of the base material. Simulated heat loss of the envelope adopting the insulation composites with VIP as the core material is nearly a half of that of the envelope adopting traditional insulation materials.

A Simplified Model for Effective Thermal Conductivity of Highly Porous Ceramic Fiber Insulation

2015 ◽  
Vol 7 (4) ◽  
Author(s):  
Nicholas P. G. Lumley ◽  
Emory Ford ◽  
Eric Minford ◽  
Jason M. Porter
Keyword(s):  
Experimental Data ◽  
Thermal Conductivity ◽  
Natural Convection ◽  
Effective Thermal Conductivity ◽  
Research Effort ◽  
Porous Ceramic ◽  
Ceramic Fiber ◽  
Chemical Process Industry ◽  
Thermophysical Model ◽  
Highly Porous

Highly porous ceramic fiber insulations are beginning to be considered as a replacement for firebrick insulations in high temperature, high pressure applications by the chemical process industry. However, the implementation of such materials has been impeded by a lack of experimental data and predictive models, especially at high gas pressure. The goal of this work was to develop a general, applied thermophysical model to predict effective thermal conductivity, keff, of porous ceramic fiber insulation materials and to determine the temperature, pressure, and gas conditions under which natural convection is a possible mode of heat transfer. A model was developed which calculates keff as the sum of conduction, convection, and radiation partial conductivities. The model was validated using available experimental data, including laboratory measurements made by this research effort. Overall, it was concluded that natural convection is indeed possible for the most porous insulations at pressures exceeding 10 atm. Furthermore, keff for some example insulations was determined as a function of temperature, pressure, and gas environment.

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