scholarly journals Bi-Layered Porous/Cork-Containing Waste-Based Inorganic Polymer Composites: Innovative Material towards Green Buildings

2020 ◽  
Vol 10 (9) ◽  
pp. 2995 ◽  
Author(s):  
Rui M. Novais ◽  
Luciano Senff ◽  
João Carvalheiras ◽  
João A. Labrincha
Keyword(s):  
Thermal Conductivity ◽  
Energy Consumption ◽  
Polymer Composites ◽  
Co2 Emissions ◽  
Renewable Resource ◽  
Inorganic Polymer ◽  
Inorganic Polymers ◽  
Waste Biomass ◽  
Low Thermal Conductivity ◽  
Heating And Cooling

Reduction of the energy consumption and CO2 emissions by the building sector might be a huge driver to mitigate climate change. One promising approach to mitigate energy consumption is the use of lightweight and low thermal-conductivity materials that could reduce the energy losses inside buildings and at the same time the use of heating and cooling devices that generate associated CO2 emissions. In this study, different strategies to produce lightweight and low thermal conductivity inorganic polymers were evaluated and compared, including the first ever production of bi-layered porous/cork-containing waste-based inorganic polymer composites. The bi-layered composites showed the lowest density (461 kg/m3) and thermal conductivity (94.9 mW/m K) values and reasonable compressive strength (0.93 MPa) demonstrating their interesting potential for enhancing the energy efficiency of buildings. Moreover, these composites were produced at room temperature, using an industrial waste (biomass fly ash) as precursor and a highly sustainable and renewable resource as light aggregate (cork), preventing the depletion of natural resources and the use of fossil-fuel derivates, respectively.

Research on the Application of VIPs to Reefer Containers

2011 ◽  
Vol 117-119 ◽  
pp. 1067-1070
Author(s):  
Jun Ji ◽  
Hou De Han ◽  
An Kang Kan
Keyword(s):  
Thermal Conductivity ◽  
Energy Consumption ◽  
Low Thermal Conductivity ◽  
Vacuum Insulation ◽  
Save Energy ◽  
Heat Preservation ◽  
Vacuum Insulation Panel ◽  
Made In

Vacuum insulation panels are distinguished by their outstandingly low thermal conductivity, which is approximately 0.004 W/ (m • K) to 0.01 W/ (m • K), only 33% to 10% of that of the traditional heat preservation materials. The heat preservation mechanism of vacuum insulation panels is elaborated in the study. The thermal conductivity of the vacuum insulation panel made in our lab were below 0.01 W/ (m • K). By analysis and calculation, with this kind of VIPs applied to refrigerated containers, its exciting properties can save energy consumption by more than 20% compared with traditional heat preservation materials.

scholarly journals Life Cycle Assessment of Dynamic Water Flow Glazing Envelopes: A Case Study with Real Test Facilities

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2195
Author(s):  
Belen Moreno Santamaria ◽  
Fernando del Ama Gonzalo ◽  
Matthew Griffin ◽  
Benito Lauret Aguirregabiria ◽  
Juan A. Hernandez Ramos
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Energy Consumption ◽  
Co2 Emissions ◽  
Water Flow ◽  
Life Cycle Cost ◽  
Energy Savings ◽  
Economic Benefits ◽  
Real World Data ◽  
Heating And Cooling

High initial costs hinder innovative technologies for building envelopes. Life Cycle Assessment (LCA) should consider energy savings to show relevant economic benefits and potential to reduce energy consumption and CO2 emissions. Life Cycle Cost (LCC) and Life Cycle Energy (LCE) should focus on investment, operation, maintenance, dismantling, disposal, and/or recycling for the building. This study compares the LCC and LCE analysis of Water Flow Glazing (WFG) envelopes with traditional double and triple glazing facades. The assessment considers initial, operational, and disposal costs and energy consumption as well as different energy systems for heating and cooling. Real prototypes have been built in two different locations to record real-world data of yearly operational energy. WFG systems consistently showed a higher initial investment than traditional glazing. The final Life Cycle Cost analysis demonstrates that WFG systems are better over the operation phase only when it is compared with a traditional double-glazing. However, a Life Cycle Energy assessment over 50 years concluded that energy savings between 36% and 66% and CO2 emissions reduction between 30% and 70% could be achieved.

scholarly journals Long-term stability of phase-separated half-Heusler compounds

2015 ◽  
Vol 17 (44) ◽  
pp. 29854-29858 ◽  
Author(s):  
J. Krez ◽  
B. Balke ◽  
S. Ouardi ◽  
S. Selle ◽  
T. Höche ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Heusler Compounds ◽  
Dendritic Microstructure ◽  
Low Thermal Conductivity ◽  
Term Stability ◽  
Long Term Stability ◽  
Heating And Cooling ◽  
P Type

The long-term stability of n- and p-type thermoelectric half-Heusler materials is investigated. The dendritic microstructure is temperature resistant and maintained the low thermal conductivity values (κ < 4 W m−1 K−1) even after 500 heating and cooling cycles.

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 Development of Geopolymers Formulations Based on Low-Grade Kaolins as a Potential Construction Material

2019 ◽  
Author(s):  
Cristiana Costa ◽  
Sara Fernandes ◽  
Ana Velosa ◽  
Fernando Rocha
Keyword(s):  
Energy Consumption ◽  
Mechanical Strength ◽  
Co2 Emissions ◽  
Construction Material ◽  
Construction Materials ◽  
High Energy ◽  
Low Grade ◽  
Inorganic Polymers ◽  
New Materials ◽  
High Energy Consumption

Sustainability, particularly in construction materials, has been a subject of growing interest. Civil construction is one of the industries where more materials are consumed, which leads to high energy consumption and CO2 emissions. The production of cement, especially clinker is largely responsible for these problems. As a solution, new materials emerge, which do not require much energy for their production, which are the alkaline cements, specifically the geopolymers. Geopolymers are inorganic polymers obtained by the alkaline activation of aluminosilicate precursors. In the present study geopolymers were developed with low grade kaolin (as a precursor) from a Portuguese company. The development of these geopolymers will be, due to their properties, a good solution for rehabilitation of earth buildings, especially in adobe. The development of these geopolymers is also a contribution to the sustainability of kaolin exploitations as it opens new markets for the low grade kaolins, presently not easily commercialized. As mechanical strength of adobe materials ranges in literature from 0.6 to 8.3 MPa, the values obtained for the developed geopolymers (between ~2 to 10 MPa) can be considered as totally adequate.

Novel photoactive inorganic polymer composites of inorganic polymers with copper(I) oxide nanoparticles

2015 ◽  
Vol 50 (22) ◽  
pp. 7374-7383 ◽  
Author(s):  
Mahroo Fallah ◽  
Kenneth J. D. MacKenzie ◽  
John V. Hanna ◽  
Samuel J. Page
Keyword(s):  
Polymer Composites ◽  
Inorganic Polymer ◽  
Oxide Nanoparticles ◽  
Inorganic Polymers

Structure and Thermoelectric Properties of New Quaternary Tin and Lead Bismuth Selenides, K1+xM4-2xBi7+xSe15 (M = Sn, Pb) and K1+xSn5-xBi11+xSe22

2000 ◽  
Vol 626 ◽  
Author(s):  
Antje Mrotzek ◽  
Kyoung-Shin Choi ◽  
Duck-Young Chung ◽  
Melissa A. Lane ◽  
John R. Ireland ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Single Crystal ◽  
Thermoelectric Properties ◽  
Three Dimensional ◽  
Structure Type ◽  
Narrow Gap ◽  
Low Thermal Conductivity ◽  
Seebeck Coefficients ◽  
Metal Atoms ◽  
Anionic Framework

ABSTRACTWe present the structure and thermoelectric properties of the new quaternary selenides K1+xM4–2xBi7+xSe15 (M = Sn, Pb) and K1-xSn5-xBi11+xSe22. The compounds K1+xM4-2xBi7+xSe15 (M= Sn, Pb) crystallize isostructural to A1+xPb4-2xSb7+xSe15 with A = K, Rb, while K1-xSn5-xBi11+xSe22 reveals a new structure type. In both structure types fragments of the Bi2Te3-type and the NaCl-type are connected to a three-dimensional anionic framework with K+ ions filled tunnels. The two structures vary by the size of the NaCl-type rods and are closely related to β-K2Bi8Se13 and K2.5Bi8.5Se14. The thermoelectric properties of K1+xM4-2xBi7+xSe15 (M = Sn, Pb) and K1-xSn5-xBi11+xSe22 were explored on single crystal and ingot samples. These compounds are narrow gap semiconductors and show n-type behavior with moderate Seebeck coefficients. They have very low thermal conductivity due to an extensive disorder of the metal atoms and possible “rattling” K+ ions.

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