scholarly journals USE OF MICROWAVE RADIATION FOR SEPARATION OF LIQUID GLASS HEAT INSULATION MATERIALS

2021 ◽  
pp. 15-24
Author(s):  
Tatyana Rymar
Keyword(s):  
Microwave Radiation ◽  
Thermal Insulation ◽  
Liquid Glass ◽  
Foam Glass ◽  
High Energy ◽  
Production Costs ◽  
Insulation Material ◽  
Volumetric Heating ◽  
Insulation Materials ◽  
Glass Granulate

The study of the thermal insulation market of Ukraine showed that the market is dominated by aerated concrete and silicates, which are used as thermal insulation materials at an average density of 300-500 kg / m3. Their disadvantages include high values of water absorption and hygroscopicity, as well as very low flexural strength, because this material does not have elasticity and the use of small bending forces leads to its cracking. Foam glass has a set of operational properties that meet the highest regulatory requirements. Foam glass is the strongest of all effective thermal insulation materials, but this material is fragile. It is sensitive to vibration - induced damage. In addition, the technology of production of foam glass is quite complex and requires high energy consumption, as a consequence, the cost of this material is high. Therefore, it was important to develop thermal insulation material with the appropriate level of performance while reducing production costs. This was achieved by using energy-saving microwave technology to swell liquid glass materials. This technology is based on the simultaneous swelling of the liquid glass granulate and the binder under microwave radiation, which, due to the volumetric heating of the liquid glass composition, allows to obtain a strong monolithic material with a rigid, homogeneous and mostly closed-porous structure. The production of thermal insulation materials is proposed to be carried out on the basis of liquid glass granulate, because the introduction of granules reduces the deformability and shrinkage of the material and prevents its cracking, increases its strength, because the granular material has a certain plastic deformation, reduces water hygroscopicity. granules swell to form a compacted shell, which slows down the absorption kinetics of water and its vapor. The monolithic granules are proposed to be carried out with a binder that foams not only due to the release of water, but also with the help of a gasifier, because this technology will allow uniform distribution of the binder in the intergranular space, thus forming a more homogeneous structure of the material, which has a positive effect on its physical and mechanical characteristics.

scholarly journals Factors for Eco-Efficiency Improvement of Thermal Insulation Materials

2016 ◽  
Vol 678 ◽  
pp. 1-13 ◽  
Author(s):  
Jun Kono ◽  
Yutaka Goto ◽  
York Ostermeyer ◽  
Rolf Frischknecht ◽  
Holger Wallbaum
Keyword(s):  
Life Cycle ◽  
Physical Properties ◽  
Production Process ◽  
Environmental Impacts ◽  
Thermal Insulation ◽  
Foam Glass ◽  
Insulation Material ◽  
Contributing Factors ◽  
Insulation Materials ◽  
Thermo Physical Properties

Thermal insulation material is an important component to reduce the environmental impact of buildings through the reduction of energy consumption in the operation phase. However, the material itself has embodied environmental impacts for the value it provides. Eco-efficiency is a method that quantifies relation between the environmental performance and the created value of a product system. This study investigated contributing factors of the eco-efficiency of thermal insulation materials to support decision making of material manufacturers. For the improvement of eco-efficiency, the assessment was made in two scopes: investigating the contributing factors of impact caused at production processes; and thermal performance through thermo-physical properties. For quantifying environmental impacts, cradle-to-grave life cycle assessment (LCA) of each materials were made. The life cycle impact assessment (LCIA) indicators used were ReCiPe H/A and global warming potential (GWP100a). For the assessment of production process, the inventories of the materials were assigned to six categories: heat, chemicals, electricity, transportation, raw materials and wastes. Among the assessed materials, contribution of electricity and heat within the production process was large for foam glass which had the highest potential to improve the eco-efficiency which was by factor 1.72. The analysis on relation between thermo-physical properties and eco-efficiency based on product data of the materials highlighted the importance of density as an indicator upon development and use. Althoughdensity often gains less attention,the finding suggested the effectiveness of improving the efficiency by having lower density without compensating the performance of the materials.

scholarly journals INVESTIGATION OF THE INFLUENCE OF MICROWAVE RADIATION ON THE PROPERTIES OF GRANULAR HEAT INSULATION MATERIALS BASED ON LIQUID GLASS

2021 ◽  
pp. 6-16
Author(s):  
Tatyana Rymar
Keyword(s):  
Microwave Radiation ◽  
Liquid Glass ◽  
Structural Changes ◽  
Glass Composition ◽  
Thermal Action ◽  
Convective Heating ◽  
Energy Costs ◽  
Chemical Methods ◽  
Volumetric Heating ◽  
Insulation Materials

The main methods of improving the performance of granular thermal insulationmaterials based on liquid glass are chemical methods of their modification, which are based onchanging their structure through the use of special ingredients. At the same time, there is a need to introduce often a large number of components and individual technological operations, which is notalways technological. One of the promising methods of changing the physical state of substancesunder the action of an electromagnetic field is non-thermal treatment of microwave radiation. Theadvantages of using microwave radiation in comparison with the generally accepted methods ofmodification of materials are the transformation of their structure without significant changes in thetechnological process and the need to use additional components. Due to volumetric heating and themechanism of non-thermal action of microwave radiation on processing objects the duration of theirheating considerably decreases. When microwave heating of a liquid glass composition part of theenergy of electromagnetic radiation is converted into heat, which contributes to the intense swellingof the material, and the other part is aimed at structural changes in the material, which improve itsproperties due to the non-thermal effect of microwave radiation. Studies show that the best set ofperformance properties have granular materials obtained under the action of microwave radiationat a power of 650 W, which corresponds to a temperature of 110-120 0C. The required duration ofsuch heat treatment is 6-7 minutes. The closest to them in terms of coefficient of swelling are materialsobtained by convective heating at a temperature of 200 0C for 1 hour, but their physical andmechanical properties are much lower. Thus, it can be noted that the use of microwave radiationallows to obtain granular thermal insulation materials with a better set of performance properties atlower energy costs for their production.

scholarly journals RESEARCH OF PROCESSES OF FORMATION OF STRUCTURE OF COMPOSITE THERMAL INSULATION MATERIALS ON THE BASIS OF LIQUID GLASS BTAINED WITH THE USE OF ENVIRONMENTALLY SAFE MICROWAVE TECHNOLOGIES

2021 ◽  
pp. 3-10
Author(s):  
Tatyana Ernstovna Rymar ◽  
Oleksandr Viktorovith Suvorin
Keyword(s):  
Thermal Conductivity ◽  
Microwave Radiation ◽  
Thermal Insulation ◽  
Liquid Glass ◽  
Large Scale ◽  
Energy Use ◽  
Scale Production ◽  
Energy Prices ◽  
Insulation Materials ◽  
Save Energy

Improving the efficiency of energy use is one of the main tasks in the chemical industry not only in Ukraine but also around the world, which is due to the steady rise in energy prices. In this regard, an effective way to save energy is the thermal modernization of buildings, industrial equipment and communications with thermal insulation materials. It should be noted that the share of domestic materials in the Ukrainian market is not more than 30 %. Therefore, the creation of new types of insulation materials is a very important task. This material is a heat–insulating material based on liquid glass, created with the involvement of microwave radiation as an alternative to traditional convective thermal heating. The technology of production of heat–insulating materials on the basis of liquid glass by hot foaming involves obtaining the material in the form of granules, not plates, due to the difficulty of uniform heating of the inner layers of large samples. The problem of large–scale production of high–quality thermal insulation materials based on liquid glass in plate form is not solved due to poor heating of the inner layers of the plate due to the low thermal conductivity of the swollen outer layers. That is why the production of composite thermal insulation materials based on granular filler and liquid glass binder is proposed to be carried out under the action of microwave radiation. Thermal insulation properties of expanded materials are directly determined by their macrostructure. Therefore, the purpose of this study is to determine changes in the structure of the material from the type and amount of ingredients used in the liquid glass composition. On the basis of the conducted researches it is shown that the materials with use as a filler of zinc oxide and as a gas–forming agent of hydrogen peroxide have the most ordered structure. It is established that their use in the amount of 9–10 wt.h. provides a rate of gas evolution and growth of pore centers, which is comparable to the process of curing composition, which allows to obtain materials with a homogeneous, fine and closed–porous structure, which provides high insulating properties with a thermal conductivity coefficient of 0.05–0.055 W / m · K, which meets the requirements for thermal insulation materials.

Preparation and Properties of Phase Change Thermal Insulation Materials

2018 ◽  
Vol 281 ◽  
pp. 131-136
Author(s):  
Shi Chao Zhang ◽  
Wei Wu ◽  
Yu Feng Chen ◽  
Liu Shi Tao ◽  
Kai Fang ◽  
...  
Keyword(s):  
Phase Change ◽  
Thermal Insulation ◽  
Calcium Silicate ◽  
Phase Change Materials ◽  
Performance Test ◽  
Thermal Protection ◽  
Insulation Material ◽  
Insulation Materials ◽  
Short Time ◽  
Change Material

With the increase of the speed of vehicle, the thermal protection system of its powerplant requires higher insulation materials. Phase change materials can absorb large amounts of heat in short time. So the introduction of phase change materials in thermal insulation materials can achieve efficient insulation in a limited space for a short time. In this paper, a new phase change thermal insulation material was prepared by pressure molding with microporous calcium silicate as matrix and Li2CO3 as phase change material. The morphology stability, exudation and heat insulation of the materials were tested. The results show that the porous structure of microporous calcium silicate has a good encapsulation when the phase transition of Li2CO3 is changed into liquid. And the material has no leakage during use. The thermal performance test also shows that the insulation performance of the material has obvious advantages in the short term application.

scholarly journals Study on Energy-saving Insulation Materials in the Building’s Exterior

2015 ◽  
Vol 4 (1) ◽  
pp. 4
Author(s):  
Yang Zhang ◽  
Yazhi Hu
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Construction Industry ◽  
New Technologies ◽  
High Energy ◽  
Insulation Material ◽  
Curtain Wall ◽  
Construction Engineering ◽  
Technology Application ◽  
Insulation Materials

<p>Construction industry has been one of China's energy guzzlers, if we can reduce the energy consumption of the building industry through the use of new materials or new technologies, which will have a significant impact on the development of economy and society. The status quo of China's construction industry, high energy consumption, paper use energy-saving technologies in the field of construction works to expand the analysis, discusses the necessity of the construction industry currently uses energy-saving insulation materials and analyzes the current energy field of construction engineering technology application status, on the basis of focus on the application of energy-saving insulation materials in construction, particularly in the new system and the new glass curtain wall insulation material in construction applications, which further enhance the energy-saving technology within the field of construction engineering the application level has a certain reference.</p>

Effect of Operating Temperatures on Thermal Conductivity of Polystyrene Insulation Material: Impact on Envelope-Induced Cooling Load

2014 ◽  
Vol 564 ◽  
pp. 315-320 ◽  
Author(s):  
Maatouk Khoukhi ◽  
Mahmoud Tahat
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Energy Performance ◽  
Building Envelope ◽  
Insulation Material ◽  
Cooling Load ◽  
Thermal Insulation Material ◽  
Insulation Materials ◽  
Energy Performance Of Buildings ◽  
The Impact

The impact of the thermal conductivity (k-value) change of polystyrene insulation material in building envelope due to changes in temperature on the thermal and energy performance of a typical residential building under hot climate is investigated. Indeed, the thermal and energy performance of buildings depends on the thermal characteristics of the building envelope, and particularly on the thermal resistance of the insulation material used. The thermal insulation material which is determined by its thermal conductivity, which describes the ability of heat to flow cross the material in presence of a gradient of temperature, is the main key to assess the performance of the thermal insulation material. When performing the energy analysis or calculating the cooling load for buildings, we use published values of thermal conductivity of insulation materials, which are normally evaluated at 24°C according to the ASTM standards. In reality, thermal insulation in building is exposed to significant and continuous temperature variations, due essentially to the change of outdoor air temperature and solar radiation. Many types of insulation materials are produced and used in Oman, but not enough information is available to evaluate their performance under the prevailing climatic condition. The main objective of this study is to investigate the relationship between the temperature and thermal conductivity of various densities of polystyrene, which is widely used as building insulation material in Oman. Moreover, the impact of thermal conductivity variation with temperature on the envelope-induced cooling load for a simple building model is discussed. This work will serve as a platform to investigate the effect of the operating temperature on thermal conductivity of other building material insulations, and leads to more accurate assessment of the thermal and energy performance of buildings in Oman.

A New Energy Saving Roofing Insulation Board System of Polyphenylene Foam Concrete

2012 ◽  
Vol 531-532 ◽  
pp. 421-424
Author(s):  
Dong Zhou Xia
Keyword(s):  
Energy Saving ◽  
Thermal Insulation ◽  
Foam Glass ◽  
Expanded Polystyrene ◽  
Glass Block ◽  
Engineering Practice ◽  
Foam Concrete ◽  
Insulation Materials ◽  
New Energy ◽  
Board System

In engineering practice, the most widely used roof insulation materials are expanded perlite, expanded vermiculite, extruded polystyrene board (XPS), expanded polystyrene board (EPS), foam glass block，rigid polyurethane foam insulation layer, and so on. These products have many advantages, such as light weight, high compressive strength, good integral property, convenient construction. But there are a lot of defects at the same time, such as bad fireproof performance and durability, environmental pollution, and so on. So we need an efficient roofing insulation materials to meet the growing needs of the roofing energy saving, energy saving roofing insulation board system of polyphenylene foam concrete just meet this demand, it has the characteristics of thermal insulation, lightweight and compressive resistance, waterproof and moistureproof, fire durable, and simple structure. Through the application of this new materials in practical engineering, the energy saving roofing insulation board will provide an efficient and practical material for future roof thermal insulation and energy saving.

scholarly journals PRODUCTION OF THERMAL INSULATION MATERIAL BASED ON VOLCANIC ASH DEPOSITS OF PRIMAGADANYA

2019 ◽  
Vol 10 (2) ◽  
pp. 78-91
Author(s):  
A. V Bolotin ◽  
S. M Sergeev ◽  
A. A Lunegova ◽  
E. A Kochetkova
Keyword(s):  
Thermal Insulation ◽  
Building Materials ◽  
Volcanic Ash ◽  
Mineral Wool ◽  
Raw Material ◽  
Thermal Calculation ◽  
Vapor Permeability ◽  
Insulation Material ◽  
Comparative Performance ◽  
Insulation Materials

Modern technologies are not standing still, and scientists are trying not only to invent new building materials, but also to find non-standard use of various raw materials that were previously considered unsuitable for use. Innovative technologies are actively used for modern construction of buildings, in particular, some types of new materials are used in the construction of various facilities. This is especially true in areas where it is not possible to import or use ordinary building materials for various reasons. Often, when designing a building, developers are wondering whether it is worth making the house warm during construction, and which insulation for the walls of the house is better to choose. This article addresses the question of which insulation for walls is most suitable for construction. The most common are mineral insulation, which are represented on the market today in the form of basalt slabs, fiberglass, etc. They have such advantages as low thermal conductivity, good thermal insulation and vapor permeability. The article presents a table with comparative performance characteristics of a mineral wool stone slab and a fiberglass slab. Stone or basalt wool has several advantages. It is able to withstand significant temperatures and temperature changes, the mats are easy to transport, convenient to install. In our opinion, a serious alternative to basalt in the production of thermal insulation materials is volcanic ash. One of the main features of volcanic ash are its building qualities, such as good thermal insulation and an environmentally friendly composition. Since here we are considering the possibility of producing insulation materials based on volcanic ash, we performed a thermal calculation of the enclosing structures. Also in the tables are the costs of transportation of volcanic ash from the field to the point of the proposed production of insulating material. Volcanic ash can be widely used in countries with high volcanic activity as an inexpensive raw material for the manufacture of building materials. It does not require additional processing and has a number of useful properties.

scholarly journals Aplikácia analytickej viacúrovňovej metódy pri výbere zatepľovacieho materiálu

2020 ◽  
Vol 19 (2) ◽  
pp. 21-26
Author(s):  
Michaela Horváthová ◽  
◽  
Linda Makovická-Osvaldová
Keyword(s):  
Thermal Insulation ◽  
Ignition Time ◽  
Insulation Material ◽  
Thermal Coefficient ◽  
Multilevel Method ◽  
Insulation Materials ◽  
Applied Method ◽  
Selection Of

The article deals with the selection of four types of insulation material based on the particular criteria. Specifically, it will be a matter of decision among facade insulation materials. We chose four species of the most used thermal insulation materials that are available on the market and are used frequently. The applied method is an analytical multilevel method that allows us to divide the whole problem into hierarchies and then compare two elements together and thus gain the weights of the criteria. Subsequently, we assessed the alternatives. The selected criteria are the price of the material, the thermal coefficient conductivity, flammability class and ignition time of the sample. The method is verified in the software BPMSG AHP priority calculator.

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