scholarly journals Experimental Verification of Use of Vacuum Insulating Material in Electric Vehicle Headliner to Reduce Thermal Load

2019 ◽  
Vol 9 (20) ◽  
pp. 4207 ◽  
Author(s):  
Baek ◽  
Lee ◽  
Kim
Keyword(s):  
Thermal Conductivity ◽  
Energy Conditions ◽  
Insulation Material ◽  
Cooling Period ◽  
Vacuum Insulation ◽  
Heating And Cooling ◽  
Cabin Temperature ◽  
Materials Used ◽  
Insulation Performance ◽  
Reduced Surface

In electric vehicles (EVs), the use of high-temperature heat transfer components that effectively block external heat and minimize cooling losses can increase vehicle mileage during heating/cooling operations and improve passenger comfort. In particular, in ensuring high thermal insulation, the car headliner forms an important component for effectively managing environmental heat energy and heating and cooling processes inside the EV. In this study, we have proposed and experimentally verified the use and efficacy of vacuum insulation material in the headliner of EVs to reduce the heat load. The thermal conductivity and air permeability of various conventional insulating and vacuum insulation materials used for the headliner were compared to accurately predict the vacuum insulation material performance. We found that the vacuum insulation material affords reduced surface roughness and thermal conductivity and high formability relative to conventional insulation. We also confirmed consequent improvements in the insulation performance by comparing the characteristics of the proposed vacuum-insulation-material headliner (relative to conventional materials) via prototyping and reliability testing. With the “improved” headliner, in summer, the temperature of the automobile cabin was lowered by 2.8 °C, and the cabin temperature was lowered by 3.9 °C during the cooling period relative to conventional insulators, which proves that the cabin temperature can be maintained at a low value during summer parking or cooling. In winter, the cabin temperature was found to be 7.7 °C higher than that obtained with the conventional insulator, which indicates that the cabin temperature can be maintained higher via reduction in the heat loss (because of using vacuum insulation) under the same heating energy conditions during winter.

scholarly journals Optimum Thickness of Thermal Insulation with Both Economic and Ecological Costs of Heating and Cooling

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3835
Author(s):  
Robert Dylewski ◽  
Janusz Adamczyk
Keyword(s):  
Thermal Insulation ◽  
Construction Materials ◽  
Optimum Thickness ◽  
Degree Days ◽  
Transfer Coefficients ◽  
Cooling Period ◽  
Heating And Cooling ◽  
Optimum Heat ◽  
Materials Used ◽  
Building Walls

The energy efficiency of the construction sector should be determined by the cleanliness of the environment and, thus, the health of society. The scientific aim of this article was to develop a methodology for determining the optimum thickness of thermal insulation, taking into account both economic and ecological aspects and considering both heating and cooling costs. The method takes into account the number of degree days of the heating period, as well as the number of degree days of the cooling period. Variants in terms of different types of thermal insulation, various types of construction materials for building walls, climatic zones and heat sources, were taken into consideration. In order to find the optimum thicknesses of thermal insulation, both in economic and ecological terms, a metacriterion was used. The optimum thicknesses of thermal insulation with the use of the metacriterion were obtained in the range of 0.11–0.55 m. It was observed that the values of the optimum heat transfer coefficients for economic and ecological reasons do not depend on the type of construction materials used for vertical walls. The type of applied heat source is of the greatest importance for the size of the economic and ecological benefits. The proposed mathematical model for determining the optimum thickness of thermal insulation with the use of a metacriterion is a kind of generalization of earlier models from the literature.

Testing reflective insulation for improvement of buildings energy efficiency

2012 ◽  
Vol 2 (1) ◽  
Author(s):  
Michalis Vrachopoulos ◽  
Maria Koukou ◽  
Dimitris Stavlas ◽  
Vasilis Stamatopoulos ◽  
Achilleas Gonidis ◽  
...  
Keyword(s):  
Building Materials ◽  
Educational Institution ◽  
Vertical Wall ◽  
Experimental Chamber ◽  
Insulation Material ◽  
Heating And Cooling ◽  
Heat Insulation Material ◽  
Wall Construction ◽  
Water Proofing ◽  
Materials Used

AbstractReflective insulation stands as an alternative to common building materials used to reduce a building’s heating and cooling loads. In this work, an experimental prototype chamber facility has been designed and constructed at the campus of the Technological Educational Institution of Halkida, located in an area of climatic zone B in Greece, aiming to the evaluation of reflective insulation’s performance. Reflective insulation is a part of the test room wall construction, specifically, heat insulation material of the vertical wall construction all directions (North, South, East, West), and temperature and water proofing element of the roof. Measurements were obtained for both winter and summer periods. Results indicate that the existence of reflective insulation during summer period averts the overheating at the interior of the experimental chamber, while during winter the heat is retained in the chamber.

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.

Core Materials of Vacuum Insulation Panels: A Review and Beyond

2012 ◽  
Vol 174-177 ◽  
pp. 1437-1440 ◽  
Author(s):  
Cheng Dong Li ◽  
Zhao Feng Chen ◽  
Wang Ping Wu ◽  
Zhou Chen ◽  
Jie Ming Zhou ◽  
...  
Keyword(s):  
High Performance ◽  
Insulation Material ◽  
Vacuum Insulation ◽  
Novel Structure ◽  
Powder Particles ◽  
Insulation Performance ◽  
Size Powder ◽  
Material Powder ◽  
Core Materials

Vacuum insulation panels (VIPs) are regarded as one of the most promising high performance thermal insulation solutions on the market today. The insulation performance of VIPs mainly depends on the quality of core materials. This paper compared three types of core materials, namely foam insulation material, powder insulation material and fibrous insulation material. Novel structure of core materials which is fiber pore structures packed with different size powder particles is also put forward on this paper. The aim of this paper is to investigate and compare various properties, requirements and possibilities for traditional core materials and put forward possible future core materials of VIPs.

scholarly journals Transparent Vacuum Insulation Panels

2021 ◽  
Author(s):  
Takao Katsura
Keyword(s):  
Thermal Conductivity ◽  
Low Cost ◽  
Conductivity Measurement ◽  
Test Method ◽  
Total Thickness ◽  
Gas Barrier ◽  
Vacuum Insulation ◽  
Apparent Thermal Conductivity ◽  
Heat Flux Meter ◽  
Insulation Performance

New, low-cost transparent vacuum insulation panels (TVIPs) using structured cores for the windows of existing buildings are proposed. The TVIP is produced by inserting the structured core, the low-emissivity film, and the adsorbent into the transparent gas barrier envelopes. In this chapter, the authors introduce the outlines, the design and thermal analysis method, the performance evaluation (test) method. Firstly, five spacers, namely peek, modified peek, mesh, silica aerogel, and frame, are selected as the structured core. The effective thermal conductivity of TVIPs with five different spacers is evaluated at different pressure levels by applying numerical calculation. The result indicated that TVIPs with frame and mesh spacers accomplish better insulation performance, with a center-of-panel apparent thermal conductivity of 7.0 × 10−3 W/m K at a pressure of 1 Pa. The apparent thermal conductivity is the same as the value obtained by the simultaneous evacuation thermal conductivity measurement applying the heat flux meter method. Furthermore, using a frame-type TVIP with a total thickness of 3 mm attached to an existing window as a curtain decreases the space heat loss by approximately 69.5%, whereas the light transparency decreases to 75%.

scholarly journals Preparation and Characterization of a Type of Green Vacuum Insulation Panel Prepared with Straw Core Material

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4604
Author(s):  
Lu Wang ◽  
Yong Yang ◽  
Zhaofeng Chen ◽  
Yiyou Hong ◽  
Zhou Chen ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Moisture Content ◽  
High Performance ◽  
Core Material ◽  
Insulation Material ◽  
Total Thermal Conductivity ◽  
Vacuum Insulation ◽  
Inner Pressure ◽  
Compression Characteristics ◽  
Vacuum Insulation Panel

The Vacuum Insulation Panel (VIP), regarded as the most promising high-performance thermal insulation material, still has application limitations because of its high cost. In this paper, VIPs using natural straw as the core material are prepared. The fiber saturation point (FSP) is important in order to determine the optimum for the use of renewable straw materials as a potential VIP core. The microstructure of straw core material, together with the relationship between the moisture content, the diametral compression strength, and the thermal conductivity of as-prepared straw VIPs are investigated. Compression characteristics of straw core material and heat insulation mechanism within the straw VIP envelope enclosure are analyzed. Total thermal conductivity of a straw VIP is sensitive to both the inner pressure and the moisture content of straw core material. The optimum drying process for straw VIPs is heating the straw core material at a temperature of 120 ℃ for 60 min, with its center-of-panel value being about 3.8 mW/(m·K).

Research on Application of Environmental Protection Type of Blowing Agent in Polyurethane Insulation Material

2013 ◽  
Vol 368-370 ◽  
pp. 963-967
Author(s):  
Liang Yang ◽  
Shuang Zhuang ◽  
Yan Fei Chen
Keyword(s):  
Thermal Conductivity ◽  
Experimental Study ◽  
Gas Phase ◽  
Insulation Material ◽  
Environment Protection ◽  
Environment Friendly ◽  
Blowing Agent ◽  
Replacement Process ◽  
Research On Application ◽  
Insulation Performance

In this paper the environment protection type blowing agent replacement process had been briefly introduced. Experimental study had been conducted on the burning and thermal insulation performance of the traditional CFC-11 (Freon) and typical environment-friendly blowing agent, and the influence rules of density and gas phase thermal conductivity on the main performance were obtained

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 Three dimensional numerical analysis of temperature distribution in an automobile cabin

2012 ◽  
Vol 16 (1) ◽  
pp. 321-326 ◽  
Author(s):  
Gokhan Sevilgen ◽  
Muhsin Kilic
Keyword(s):  
Temperature Distribution ◽  
Numerical Analysis ◽  
Experimental Studies ◽  
Three Dimensional ◽  
Numerical Analyses ◽  
Cooling Period ◽  
Heating And Cooling ◽  
Temperature Distributions ◽  
Cabin Temperature ◽  
Dynamics Method

In this study, 3-D numerical analysis of temperature distribution in the automobile cabin were performed by using computational fluid dynamics method. For this purpose, a 3-D automobile cabin including window and outer surfaces was modeled by using the real dimensions of a car. To evaluate the results of numerical analysis according to thermal comfort, a virtual manikin divided into 17 parts with real dimensions and physiological shape was added to the model of the automobile cabin. Temperature distributions of the automobile cabin were obtained from the results of the 3-D steady and transient numerical analyses for standard heating and cooling period. Validations of the results were achieved by comparing to the results of the experimental studies performed simultaneously with the numerical analyses.

scholarly journals Preparation and properties of silicate inorganic exterior wall insulation based on thermal energy storage

2020 ◽  
Vol 24 (5 Part B) ◽  
pp. 3109-3118
Author(s):  
Zifan Zhou ◽  
Guofu Tu ◽  
Feng Xu ◽  
Zhaofeng Song ◽  
Na Li
Keyword(s):  
Thermal Conductivity ◽  
Fly Ash ◽  
Thermal Insulation ◽  
Thermal Energy ◽  
Testing Machine ◽  
Insulation Material ◽  
Exterior Wall ◽  
Thermal Insulation Material ◽  
Insulation Materials ◽  
Insulation Performance

The key to building energy conservation is how to make the exterior wall have good thermal insulation performance, reduce the heat loss of the building?s peripheral structure, develop new exterior wall insulation materials, and effectively achieve energy saving. In this paper, a new type of composite silicate insulation material was prepared by using fly ash, sepiolite fiber, basalt fiber, and cement as raw materials. According to the analysis of the action of each component of the composite silicate thermal insulation material, the composite silicate thermal insulation material is prepared by selecting different raw material ratios, and the fly ash and sepiolite fibers are analyzed by a thermal conductivity measuring instrument and a hydraulic universal testing machine. The influence of water-cement ratio on the thermal conductivity, tensile strength, and compressive strength of composite silicate insulation materials. Through research, it is found that this composite silicate exterior wall insulation material utilizes some abandoned resources to help the building exterior wall to store thermal energy. The preparation process is simple, the insulation performance is good, the mechanical strength is high, and there is great promotion value and application prospect.

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