scholarly journals Analysis of Energy Efficiency in Construction Solutions at the Façade-Slab Connection

2013 ◽  
Vol 787 ◽  
pp. 731-735 ◽  
Author(s):  
Jose Vercher ◽  
Carlos Lerma ◽  
Marisol Vidal ◽  
Enrique Gil
Keyword(s):  
Thermal Analysis ◽  
Energy Efficiency ◽  
Energy Saving ◽  
Heat Loss ◽  
Thermal Insulation ◽  
Thermal Loss ◽  
Constructive Solution ◽  
Thermal Bridge ◽  
Thermal Bridges

Façade-slab connection is the main thermal bridge of buildings. In this work, different options are analyzed according to the location of the thermal insulation. Heat loss is measured for each option. According to thermal analysis performed we conclude that cover the buildings façade completely without interruption at the slabs front is essential to avoid thermal bridges. The new option that interrupts the cantilever to put insulation on the entire façade is just effective to isolate the entire cantilever and is an easier constructive solution. This insulation continuity is needed to prevent ceiling condensation, since the energy saving is not important compared to windows thermal loss.

scholarly journals THE INFLUENCE OF THE METHOD OF LAYING PIPELINES ON THE ENERGY EFFICIENCY OF THE HEATING NETWORK

2019 ◽  
Vol 10 (2) ◽  
pp. 59-66
Author(s):  
E. A Biryuzova ◽  
A. S Glukhanov
Keyword(s):  
Energy Efficiency ◽  
Heat Loss ◽  
Thermal Insulation ◽  
Thermal Energy ◽  
Great Influence ◽  
Temperature Fields ◽  
Insulation Material ◽  
Design Work ◽  
Heat Networks ◽  
Insulation Thickness

Through pipelines of heat networks, due to their large length, a large amount of thermal energy is lost. Identification of technical solutions related to improving the energy efficiency of heating networks is an urgent task at present. The article is devoted to the consideration of options for laying pipelines of heat networks during design work. In the conducted studies, two main methods of underground laying of pipelines of heat networks with the choice of the most energy-efficient, with minimal losses of thermal energy are considered. Channel and channelless laying methods are investigated with the same design features and technological conditions of operation of pipelines of heat networks using the same thermal insulation material. For each option, the required thickness of the thermal insulation is determined by the normalized density of the heat flow, thermal calculations are performed to determine the heat loss and the value of the temperature fields generated around the operating pipelines of the heat networks. The obtained values of the thermal insulation thickness in the channel method of laying pipelines are 30-50 % lower than those in channelless laying. The heat loss values, according to the results of the heat calculation for the options under consideration, in the channel method of laying are reduced by 47-65 %. The temperature fields formed around the pipelines of thermal networks with channelless laying significantly exceed the natural value of the soil temperature at the depth of the pipeline. What has a great influence on the determination of the distance to adjacent pipelines and other utilities, laid underground, in the zone of the thermal network. A comparative analysis of the results obtained makes it possible to single out the choice of the method of laying the pipeline into a group of measures aimed at energy saving and increasing energy efficiency in heating systems.

scholarly journals The Influence of Different Facings of Polyisocyanurate Boards on Heat Transfer through the Wall Corners of Insulated Buildings

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1991 ◽  
Author(s):  
Tomas Makaveckas ◽  
Raimondas Bliūdžius ◽  
Arūnas Burlingis
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Heat Flux ◽  
Thermal Insulation ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Thermal Bridge ◽  
Thermal Bridges ◽  
The Impact ◽  
Heat Flow Meter

Polyisocyanurate (PIR) thermal insulation boards faced with carboard, plastic, aluminum, or multilayer facings are used for thermal insulation of buildings. Facing materials are selected according to the conditions of use of PIR products. At the corners of the building where these products are joined, facings can be in the direction of the heat flux movement and significantly increase heat transfer through the linear thermal bridge formed in the connection of PIR boards with facing of both walls. Analyzing the installation of PIR thermal insulation products on the walls of a building, the structural schemes of linear thermal bridges were created, numerical calculations of the heat transfer coefficients of the linear thermal bridges were performed, and the influence of various facings on the heat transfer through the thermal bridge was evaluated. Furthermore, an experimental measurement using a heat flow meter apparatus was performed in order to confirm the results obtained by numerical calculation. This study provides more understanding concerning the necessity to evaluate the impact of different thermal conductivity facings on the heat transfer through corners of buildings insulated with PIR boards.

scholarly journals Automobile in the Disposition of Energy-Saving Houses

2014 ◽  
Vol 12 ◽  
pp. 158-163
Author(s):  
Josef Chybík
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Thermal Insulation ◽  
Open Space ◽  
Thermal Bridges ◽  
Structural Engineers ◽  
Thermal Relations

In the disposition of energetically economic houses, automobile abandons its stereotype held for so many years according to which it was placed to rest “under one roof” with other residential and utility rooms. However, this diagram shows a range of collisions manifesting with difficult building details, with occurrence of thermal bridges and thermal relations. This results in increased financial demands for drafting efficient thermal insulation layers or higher demand for energy consumption necessary to heat up the building. Generally, architects and structural engineers are not sufficiently aware of the fact that at the same time this is a factor that provides higher potential for faster ageing of car bodies and chassis when cars are parked “inside the house” than in means of transport parked in open carports or in an open space. This Paper deals with analyses of this important, yet often omitted or less-known fact.

Thermal Bridges Minimizing through Typical Details in Low Energy Designing

2014 ◽  
Vol 899 ◽  
pp. 62-65 ◽  
Author(s):  
Rastislav Ingeli ◽  
Boris Vavrovič ◽  
Miroslav Čekon
Keyword(s):  
Energy Efficiency ◽  
Thermal Insulation ◽  
Energy Demand ◽  
Building Energy ◽  
Building Envelope ◽  
Low Energy ◽  
Building Energy Efficiency ◽  
Low Energy Buildings ◽  
Thermal Bridges ◽  
The Impact

Energy demand reduction in buildings is an important measure to achieve climate change mitigation. It is essential to minimize heat losses in designing phase in accordance of building energy efficiency. For building energy efficiency in a mild climate zone, a large part of the heating demand is caused by transmission losses through the building envelope. Building envelopes with high thermal resistance are typical for low-energy buildings in general. In this sense thermal bridges impact increases by using of greater thickness of thermal insulation. This paper is focused on thermal bridges minimizing through typical system details in buildings. The impact of thermal bridges was studied by comparative calculations for a case study of building with different amounts of thermal insulation. The calculated results represent a percentage distribution of heat loss through typical building components in correlation of various thicknesses of their thermal insulations.

scholarly journals Efficiency of Different Balcony Slab Modernization Method in Retrofitted Multi-Family Buildings

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6666
Author(s):  
Beata Sadowska ◽  
Piotr Bieranowski
Keyword(s):  
Energy Efficiency ◽  
Heat Loss ◽  
Cost Effective ◽  
Economic Effects ◽  
Loss Reduction ◽  
Modern Material ◽  
Eu Directive ◽  
Surface Condensation ◽  
Large Panel ◽  
Thermal Bridges

Many buildings have considerable thermal bridges at the junction of balcony slabs with walls. To achieve the new EU directive targets related to energy efficiency, greater attention should be paid to such design details. This study analyzes the efficiency of traditional balcony slab modernization methods, the use of modern insulation materials and a new alternative system: an added self-supporting light balcony system (LKBD) in retrofitted large-panel buildings. The main objective was to capture cost-effective renovation methods from both the heat loss reduction perspectives and risk of surface condensation. The analyses, carried out in four buildings, have shown that at current costs, the thermal modernization of balconies is not economically efficient (SPBT>98.4 years). However, it is necessary because leaving the balcony slabs without insulation or only insulating them from the bottom carries the risk of surface condensation. The most cost-effective renovation method is to insulate the balcony slabs from below and above with the thickest possible XPS layer (SPBT = 98.4 years; 107.4 years). Replacing XPS with modern material increases SPBT by almost 50%, for the LKBD system, SPBT = 269.2–281.5 years. More favorable energy and economic effects related to the reduction of balcony thermal bridges were achieved in the wall with lower insulation.

Analysis on Heat Loss Due to Improper Opening Window of Teaching Building

2012 ◽  
Vol 512-515 ◽  
pp. 2726-2729
Author(s):  
Rui Wang ◽  
Jing Ye Zhao ◽  
Wen Hai Wang
Keyword(s):  
Energy Conservation ◽  
Energy Saving ◽  
Heat Loss ◽  
Thermal Insulation ◽  
Exterior Wall ◽  
Long Time

By taking a teaching building of one university in Beijing as an example, this paper calculated the heat loss owing to long time opening window of classrooms in winter and compared the heat loss to the heat which is saved by external thermal insulation of exterior wall of the teaching building through method of air changes. The paper aims at enhancing people's awareness on energy saving and improving “Behavior Energy Conservation” to the same status of "Technology Energy Conservation".

scholarly journals ACCOUNTING FOR THE INFLUENCE OF THE BUILDING SHAPE ON ITS ENERGY EFFICIENCY

2021 ◽  
Vol 112 ◽  
pp. 10-15
Author(s):  
M.V. Rubtsova ◽  
◽  
Е.Е. Semenova
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Energy Saving ◽  
Heat Loss ◽  
Energy Efficient ◽  
Three Dimensional ◽  
Spatial Characteristics ◽  
Space Planning ◽  
Floor Area ◽  
Building Shape

The influence of building plan configurations in relation to their spatial characteristics on their energy consumption is considered. The article substantiates the relevance of the research of space-planning solutions of building forms, taking into account energy efficiency. As the object of research, the authors selected the most common three-dimensional configurations of building forms, taking into account energy efficiency. Examples of the analysis of the main space-planning parameters of the building and the prerequisites for their influence on its heat loss are considered with the provided graphic materials that allow you to find out the dependence of the change in the area of enclosing structures on the change in the floor area. This comparison is carried out in order to determine an energy-efficient and rationally arranged space-planning solution, taking into account the principles of energy saving for the construction of buildings.

Thermal Analysis in an Intermittent Ceramic Kiln

2018 ◽  
Vol 20 ◽  
pp. 124-142
Author(s):  
R. Soares Gomez ◽  
A.G. Barbosa de Lima ◽  
T.R. Nascimento Porto ◽  
J. Lacerda de Oliveira ◽  
Morgana Vasconcellos Araújo ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Analysis ◽  
Heat Loss ◽  
Thermal Insulation ◽  
Ceramic Materials ◽  
Thermal Discomfort ◽  
External Temperature ◽  
Production Stages ◽  
Insulation Thickness ◽  
Work Accident

The ceramic products processing requires a high consumption of energy. Through the drying and firing stages, the molded product is subjected to high temperatures in a kiln, to obtain the product with required levels of rigidity and resistance. This energy consumption must be evaluated to improve the energy efficiency of the process. This work presents the fundamentals of ceramic materials processing and perform a thermal analysis in an intermittent ceramic kiln. This analysis is based on heat transfer measurements, that occur in the kiln during the ceramic production stages, and effects of the thermal insulation thickness on the heat transfer between the kiln and the environment. The results showed that a considerable amount of energy is used to heat the kiln surfaces, that the greatest heat loss occurs by radiation of the kiln walls and that the use of thermal insulation provides considerable reduction in this heat loss, as well as the reduction in kiln external temperature, which minimize thermal discomfort and work accident risks.

scholarly journals Self-Organised Approach to Designing Building Thermal Insulation

2020 ◽  
Vol 12 (14) ◽  
pp. 5764
Author(s):  
Purvesh Bharadwaj ◽  
Ljubomir Jankovic
Keyword(s):  
Energy Efficiency ◽  
Heat Loss ◽  
Thermal Insulation ◽  
Energy Performance ◽  
Three Dimensions ◽  
Insulation Material ◽  
New Approach ◽  
Agent Based ◽  
Optimum Energy ◽  
Building Heat

Traditionally, the uniform application of thermal insulation is practised within the built environment sector to achieve desired building regulation standards for energy efficiency. However, that approach does not follow the building heat loss field, and it is therefore poorly matched to the actual heat loss from the building, thus achieving sub-optimum energy performance. This research aims to visualise building heat loss field in three dimensions and to create self-organised thermal insulation patterns that are proportional in thickness to the intensity of heat loss. This is achieved using a 3D agent-based model, in which each agent that represents a miniature object of thermal insulation moves up the gradient of the heat loss representation and competes for its position with the neighbouring thermal insulation components, depending upon the gradient intensity. This creates a self-organised thermal insulation pattern through the competition between the thermal insulation components and through overcrowding in the areas with higher heat loss intensity. This helps to visualise the heat loss field and create a representation of thermal insulation that is ideally matched to it. The result is assessed for its energy performance using a conventional energy performance analysis. That analysis shows that this approach leads to reductions in energy consumption and carbon emissions in comparison with the conventional approach that uses the same amount of thermal insulation material. The overall result increases our understanding of 3D heat loss and introduces a new approach for designing building thermal insulation.

Evaluation Method for Energy Saving Effect of Reflective Thermal Insulation Coatings

2015 ◽  
Vol 744-746 ◽  
pp. 2348-2353
Author(s):  
Meng Ping Feng ◽  
Xiao Qian Qian ◽  
Yao Tai Zhu ◽  
Fang Ruan
Keyword(s):  
Energy Efficiency ◽  
Thermal Resistance ◽  
Energy Saving ◽  
Thermal Insulation ◽  
Evaluation Method ◽  
Power Saving ◽  
Electricity Consumption ◽  
Heating Process ◽  
Building Energy Efficiency ◽  
Saving Effect

According to the climate and energy saving characteristics in the hot summer and cold winter zone, especially in view of requirements for thermal insulation in summer, reflective thermal insulation coatings (RTIc) are gradually applied in building energy efficiency of exterior envelope. A feasible evaluation method for energy saving effect is very important for acceptance of energy efficient building construction. In this paper, thermal resistance has been used as the evaluation index. The energy efficiency of the reflective thermal insulation coatings was investigated. Four hot boxes were applied contrast test. Based on the qualitative and quantitative analysis of electricity consumption within 36 hours and comparative analysis of heating process simulating sunlight environment, thermal resistance of RTIc can be calculated on the basis of the correlation between power saving rate and thermal resistance so that energy saving effect of RTIc can be quantitatively characterized.

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