High-Tech Solutions for Building Retrofit: Investigation of Window Systems with Vacuum Glazing

2016 ◽  
Vol 824 ◽  
pp. 437-444 ◽  
Author(s):  
Olga Proskurnina ◽  
Ulrich Pont ◽  
Matthias Schuss ◽  
Christian Sustr ◽  
Ernst Heiduk ◽  
...  
Keyword(s):  
Thermal Performance ◽  
Structural Integrity ◽  
Building Envelope ◽  
High Tech ◽  
Major Step ◽  
Building Stock ◽  
Research Project ◽  
Present Contribution ◽  
Ongoing Research ◽  
Vacuum Glazing

The retrofit of the historical building stock has gained significance due to energy efficiency requirements in the building sector. Major attention is drawn to windows as they are typically the building components with the highest heat transfer coefficient of the building envelope. Therefore, vacuum glazing is a potential option for improving the thermal performance of casement windows. In this context, specific considerations regarding building physics and heritage protection regulations are required.The present contribution describes the current progress of the research project VIG-SYS-RENO. New double glazing products with durable vacuum layer are emerging on the market. Such developments can be regarded as a major step toward energy-efficient windows with U-values close to conventional opaque building elements. Small thickness and excellent thermal resistance of vacuum insulation glazing renders it an attractive option in thermal retrofit of historical buildings. Vacuum glazing systems could potentially offer a feasible balance between conservation and thermal performance of windows. However, prior to any application, a set of aspects and potential issues have to be assessed and explored. These include: (i) thermal bridging effects in different joint positions, for instance the glass edge seal and the frame & wall joint; (ii) the positioning of tight layers in composite or casement windows; (iii) aspects of structural integrity of windows equipped with vacuum glazing. The present contribution structures the different aspects that need to be considered in utilization of vacuum glazing in thermal retrofit, describes applied evaluation methods, first results of the ongoing research project, and illustrates the influence of various rebate depth and length of the edge seal on thermal transmission of the window.

scholarly journals Thermal Performance Improvement of Double-Pane Lightweight Steel Framed Walls Using Thermal Break Strips and Reflective Foils

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6927
Author(s):  
Paulo Santos ◽  
Telmo Ribeiro
Keyword(s):  
Thermal Resistance ◽  
Performance Improvement ◽  
Thermal Performance ◽  
Building Envelope ◽  
Building Stock ◽  
Air Cavity ◽  
Lightweight Steel ◽  
Increase Energy Efficiency ◽  
Resistance Increase ◽  
The Face

The reduction of unwanted heat losses across the buildings’ envelope is very relevant to increase energy efficiency and achieve the decarbonization goals for the building stock. Two major heat transfer mechanisms across the building envelope are conduction and radiation, being this last one very important whenever there is an air cavity. In this work, the use of aerogel thermal break (TB) strips and aluminium reflective (AR) foils are experimentally assessed to evaluate the thermal performance improvement of double-pane lightweight steel-framed (LSF) walls. The face-to-face thermal resistances were measured under laboratory-controlled conditions for sixteen LSF wall configurations. The reliability of the measurements was double-checked making use of a homogeneous XPS single panel, as well as several non-homogeneous double-pane LSF walls. The measurements allowed us to conclude that the effectiveness of the AR foil is greater than the aerogel TB strips. In fact, using an AR foil inside the air cavity of double-pane LSF walls is much more effective than using aerogel TB strips along the steel flange, since only one AR foil (inner or outer) provides a similar thermal resistance increase than two aerogel TB strips, i.e., around +0.47 m2∙K/W (+19%). However, the use of two AR foils, instead of a single one, is not effective, since the relative thermal resistance increase is only about +0.04 m2∙K/W (+2%).

scholarly journals Recent progress in the development of windows with vacuum glass

2019 ◽  
Vol 282 ◽  
pp. 02020
Author(s):  
Ulrich Pont ◽  
Magdalena Wölzl ◽  
Peter Schober ◽  
Shiva Najaf Khosravi ◽  
Matthias Schuss ◽  
...  
Keyword(s):  
Thermal Performance ◽  
Recent Progress ◽  
Current Practice ◽  
Research Projects ◽  
Weak Spot ◽  
Present Contribution ◽  
Surface Condensation ◽  
Vacuum Glazing ◽  
Frame Construction ◽  
Glass Edge

This contribution reports on recent advances in the utilization of vacuum glass in contemporary window construction. Generally speaking, vacuum glazing consists of two glass panes with an evacuated interstitial space. To maintain the functionality of the glazing, a vacuum-tight edge seal and a grid of distance-holding pillars are required. Vacuum glazing features a first-rate thermal performance as it significantly reduces conductive and convective heat transport rates. In comparison to multi-pane insulation glasses of comparable thermal performance, vacuum glass products feature a reduced weight and construction depth. However, the application of vacuum glass in windows requires a critical rethinking of the current practice of window construction, especially with regard to thermal bridges and the related surface condensation risk at the glass/frame-construction joints. Specifically, the glass edge seal, which can be considered to be the weak spot of vacuum glass in terms of heat transfer, requires an insulating cover that is not provided in typical insulation glass frame configurations. Further relevant aspects to be considered include the structural stability of window constructions with vacuum glass, the acoustical performance, and issues regarding usability. In this context, the present contribution highlights the methodology and findings of two recent research projects (MOTIVE, FIVA) that addressed window construction requirements with regard to vacuum glazing deployment.

Information Needs of Microenterprise Owners in Louisiana

2013 ◽  
Author(s):  
Tao Jin
Keyword(s):  
Information Needs ◽  
Wide Spectrum ◽  
Research Project ◽  
Ongoing Research ◽  
Industrial Sectors

This presentation will report on an ongoing research project about the information needs of microenterprise owners in Louisiana. Microenterprises are those businesses with fewer than five employees or sole proprietorships with no employees. They exist across all industrial sectors and incorporate a wide spectrum of information needs.Cette communication présente un projet de recherche en cours s'intéressant aux besoins informationnels des propriétaires de microentreprises de la Louisiane. Les microentreprises comptent moins de cinq employés, y compris celles à propriétaire unique sans employé, et sont présentes dans tous les secteurs d'activités. Les besoins informationnels varient donc grandement.

scholarly journals Optimal Renovation Strategies through Life-Cycle Analysis in a Pilot Building Located in a Mild Mediterranean Climate

2021 ◽  
Vol 11 (4) ◽  
pp. 1423
Author(s):  
José Manuel Salmerón Lissen ◽  
Cristina Isabel Jareño Escudero ◽  
Francisco José Sánchez de la Flor ◽  
Miriam Navarro Escudero ◽  
Theoni Karlessi ◽  
...  
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
Mediterranean Climate ◽  
Building Envelope ◽  
Economic Life ◽  
Hot Water ◽  
Optimal Solutions ◽  
Building Stock ◽  
Existing Building ◽  
The Cost

The 2030 climate and energy framework includes EU-wide targets and policy objectives for the period 2021–2030 of (1) at least 55% cuts in greenhouse gas emissions (from 1990 levels); (2) at least 32% share for renewable energy; and (3) at least 32.5% improvement in energy efficiency. In this context, the methodology of the cost-optimal level from the life-cycle cost approach has been applied to calculate the cost of renovating the existing building stock in Europe. The aim of this research is to analyze a pilot building using the cost-optimal methodology to determine the renovation measures that lead to the lowest life-cycle cost during the estimated economic life of the building. The case under study is an apartment building located in a mild Mediterranean climate (Castellon, SP). A package of 12 optimal solutions has been obtained to show the importance of the choice of the elements and systems for renovating building envelopes and how energy and economic aspects influence this choice. Simulations have shown that these packages of optimal solutions (different configurations for the building envelope, thermal bridges, airtightness and ventilation, and domestic hot water production systems) can provide savings in the primary energy consumption of up to 60%.

Chinese Television in Africa

2021 ◽  
pp. 026327642110120
Author(s):  
Alessandro Jedlowski
Keyword(s):  
Soft Power ◽  
The Political ◽  
Power Dynamics ◽  
Economic Factors ◽  
Research Project ◽  
Chinese Media ◽  
Ongoing Research ◽  
The Media ◽  
Chinese Television ◽  
Media Company

On the basis of the results of an ongoing research project on the activities of the Chinese media company StarTimes in Nigeria and Côte d’Ivoire, this paper analyses the fluid and fragmentary dimension of the engagements between Chinese media and African publics, while equally emphasizing the power dynamics that underlie them. Focusing on a variety of ethnographic sources, it argues for an approach to the study of Chinese media expansion in Africa able to take into account, simultaneously, the macro-political and macro-economic factors which condition the nature of China–Africa media interactions, the political intentions behind them (as, for example, the Chinese soft power policies and their translation into specific media contents), and the micro dimension of the practices and uses of the media made by the actors (producers and consumers of media) in the field.

Evaluating dynamic thermal performance of building envelope components using small-scale calibrated hot box tests

2021 ◽  
pp. 111342
Author(s):  
Zhenglai Shen ◽  
Adam L. Brooks ◽  
Yawen He ◽  
Som S. Shrestha ◽  
Hongyu Zhou
Keyword(s):  
Thermal Performance ◽  
Building Envelope ◽  
Small Scale

scholarly journals Preparation of microencapsulated PCMs for energy saving and thermal comfort of buildings

2021 ◽  
Vol 23 (09) ◽  
pp. 277-287
Author(s):  
Ashraf Mohamed Heniegal ◽  
◽  
Omar Mohamed Omar Ibrahim ◽  
Nour Bassim Frahat ◽  
Mohamed Amin ◽  
...  
Keyword(s):  
Thermal Performance ◽  
Chemical Interaction ◽  
Spherical Shape ◽  
Building Envelope ◽  
Scanning Calorimetry ◽  
Indoor Temperature ◽  
New Techniques ◽  
Consumption Energy ◽  
Local Materials ◽  
Regular Spherical Shape

Energy improvement techniques for buildings are among the modern studies that concentrate on new techniques and methods of saving energy and improving the thermal performance in buildings. This research aims to prepare microencapsulated-PCMs (micro-PCMs) by using local materials and studied the influence of using micro-PCMs on thermal performance improvement and PCMs leakage problems improvement. The micro-PCMs of paraffin wax were prepared as the core PCMs materials while the melamine-formaldehyde polymer as the shell. The micro-PCMs were characterized through scanning electron-microscopy (SEM), energy-dispersive X-ray (EDX) spectrometry, Fourier-transform infrared spectroscopy, and differential scanning calorimetry. Analysis results showed the prepared micro-PCMs present a regular spherical shape and confirm that the formation composite of the shell effectively encapsulated the cores. Furthermore, the absence of chemical interaction between the MF and the PW components. The micro-PCM have potential for architectural applications in the building-envelope to store thermal energy, provide indoor-temperature at the comfortable range, and reduce the consumption energy in buildings.

scholarly journals Application of Urban Scale Energy Modelling and Multi-Objective Optimization Techniques for Building Energy Renovation at District Scale

2021 ◽  
Vol 13 (20) ◽  
pp. 11554
Author(s):  
Fahad Haneef ◽  
Giovanni Pernigotto ◽  
Andrea Gasparella ◽  
Jérôme Henri Kämpf
Keyword(s):  
Energy Efficiency ◽  
Building Energy ◽  
Energy Performance ◽  
Building Envelope ◽  
Optimization Techniques ◽  
Multi Objective Optimization ◽  
Building Stock ◽  
Energy Efficiency Measures ◽  
Multi Objective ◽  
Efficiency Measures

Nearly-zero energy buildings are now a standard for new constructions. However, the real challenge for a decarbonized society relies in the renovation of the existing building stock, selecting energy efficiency measures considering not only the energy performance but also the economic and sustainability ones. Even if the literature is full of examples coupling building energy simulation with multi-objective optimization for the identification of the best measures, the adoption of such approaches is still limited for district and urban scale simulation, often because of lack of complete data inputs and high computational requirements. In this research, a new methodology is proposed, combining the detailed geometric characterization of urban simulation tools with the simplification provided by “building archetype” modeling, in order to ensure the development of robust models for the multi-objective optimization of retrofit interventions at district scale. Using CitySim as an urban scale energy modeling tool, a residential district built in the 1990s in Bolzano, Italy, was studied. Different sets of renovation measures for the building envelope and three objectives —i.e., energy, economic and sustainability performances, were compared. Despite energy savings from 29 to 46%, energy efficiency measures applied just to the building envelope were found insufficient to meet the carbon neutrality goals without interventions to the system, in particular considering mechanical ventilation with heat recovery. Furthermore, public subsidization has been revealed to be necessary, since none of the proposed measures is able to pay back the initial investment for this case study.

scholarly journals THE IMPACT OF THERMAL PERFORMANCE ON THE ROOF SURFACE TO ENERGY EFFICIENT OF HIGH-RISE BUILDING IN THE TROPICAL REGION

Arsitektura ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 129
Author(s):  
Sri Yuliani ◽  
Wiwik Setyaningsih
Keyword(s):  
Thermal Performance ◽  
Energy Efficient ◽  
Heat Load ◽  
Building Envelope ◽  
Tropical Region ◽  
High Rise ◽  
High Rise Building ◽  
Real Model ◽  
Urban Heat ◽  
The Impact

<p class="Abstract"><em>The surface temperature of the building material may release a heat load in the micro-environment. The largest building envelope receives the heat load of solar radiation is the roof. The strategic roof position at the top of the building has the opportunity to radiate heat received into the environment. Heat emissions lead to rising temperatures, so it is necessary to lower the temperature in micro-environment. When the heat of the building is not lowered will lead to an increase in the urban heat island (UHI). The objective of the study was to find the relationship between the thermal performance of the roof of the building and the energy efficiency in the high-rise building, in order to establish efficient thermal comfort. The research method uses experimental way in real model which is in Surakarta City, as humid tropical climate area. The result of the study is a comparison of the heat performance of three roofing materials which would later recommend the criteria of energy efficient roof for high buildings.</em><em></em></p>

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