Thermal Insulation Of The Foundation Walls Of Buildings And Calculation Of Its Thickness

2021 ◽  
Vol 03 (04) ◽  
pp. 70-78
Author(s):  
Tulakov Elmurad Salomovich ◽  
◽  
Matyokubov Bobur Pulatovich ◽  
Keyword(s):  
Surface Temperature ◽  
Thermal Insulation ◽  
Energy Efficient ◽  
Building Materials ◽  
The Body ◽  
Dew Point ◽  
Dew Point Temperature ◽  
Energy Efficient Buildings ◽  
Basement Walls ◽  
External Barrier

If the surface temperature of any building material drops sharply without changing the humidity and the surface temperature is lower than the dew point temperature, dew-like water droplets are formed on the surface of this material. This condition is called condensing humidity condition. Condensation moisture formed on the surfaces of building materials and external barriers is slowly absorbed into the body of building materials over time, increasing the relative humidity of this structure. Condensation moisture can be observed when the temperature of the surfaces of external barrier structures drops sharply. This condition can be observed everywhere where the basement is connected to the outer walls of the basement. The article deals with the issue of thermal insulation and calculation of basement walls of modern energy-efficient buildings, which are widely used in the country and abroad.

Evaluation of the relationship between daily extreme precipitation and temperature over Eastern China

2020 ◽  
Author(s):  
Rui Wang
Keyword(s):  
Surface Temperature ◽  
Extreme Precipitation ◽  
Eastern China ◽  
Precipitable Water ◽  
Precipitation Intensity ◽  
Dew Point ◽  
Near Surface ◽  
Dew Point Temperature ◽  
The Relationship ◽  
Precipitation And Temperature

<p>    In this work, the relationship between daily extreme precipitation and temperature is investigated by using rain gauge precipitation data and corresponding the Integrated Global Radiosonde Archive over eastern China during 1998-2012. Eventually, 14 stations are selected to explore the relationship in eastern China (MEC) and southeastern China (SEC). The result shows that daily extreme precipitation intensity increases approximately 7% when near surface temperature increases 1 °C in MEC and SEC, which generally follows Clausius–Clapeyron (CC) rate (CC rate describes the increasing rate of water vapor with temperature). Moreover, the regression slopes for the logarithmic daily extreme precipitation intensity and near surface temperature range from 3% °C<sup>-1</sup> to 9% °C<sup>-1</sup> at the selected stations in MEC and SEC. However, extreme precipitation intensity decreases with near surface temperature when the temperature is higher than 25 °C. That is, the increase of extreme precipitation with near surface temperature performances single peak structure in MEC and SEC. The variation of extreme precipitation and near surface dew point temperature shows the similar pattern in MEC and SEC (The transition dew point temperature is also about 25 °C). Therefore, <strong>it could be deduced that extreme precipitation intensity does not always increase with climate warming in MEC and SEC.</strong> In addition, precipitable water, which corresponds to extreme precipitation event, increases with near surface temperature at CC rate. <strong>It is found that the increase rate of precipitable water with temperature is closer to CC rate than that of extreme precipitation.</strong></p>

scholarly journals Multi layer perceptron model in pattern recognition of surface parameters during pre-monsoon thunderstorm

MAUSAM ◽  
2022 ◽  
Vol 53 (4) ◽  
pp. 417-424
Author(s):  
SUTAPA CHAUDHURI ◽  
SURAJIT CHATTOPADHYAY
Keyword(s):  
Pattern Recognition ◽  
Fuzzy Logic ◽  
Surface Temperature ◽  
Surface Pressure ◽  
Dew Point ◽  
Multi Layer Perceptron ◽  
Surface Parameters ◽  
Point Temperature ◽  
Dew Point Temperature ◽  
Definite Pattern

The concept of Multi Layer Perceptron and Fuzzy logic is introduced in this paper to recognize the pattern of surface parameters pertaining to forecast the occurrence of pre-monsoon thunderstorms over Kolkata (22 ° 32¢ , 88 ° 20¢ ).   The results reveal that surface temperature fluctuates significantly from Fuzzy Multi Layer Perceptron (FMLP) model values on thunderstorm days whereas on non-thunderstorm days FMLP model fits well with the surface temperature.   The results further indicate that no definite pattern could be made available with surface dew point temperature and surface pressure that can help in forecasting the occurrence of these storms.

scholarly journals The Question of Modeling a Structure Structural Insulation Materials for Energy-Efficient Civil Buildings

2019 ◽  
Vol 8 (4) ◽  
pp. 7692-7694
Keyword(s):  
Mathematical Modeling ◽  
Thermal Insulation ◽  
Energy Efficient ◽  
Simulation Modeling ◽  
Building Materials ◽  
Theoretical Studies ◽  
Insulation Materials ◽  
Cellular Concrete

This article presents theoretical studies on the mathematical modeling of the structure of constructive thermal insulation building materials. The developed principle block is a diagram of the methodology of structural and simulation modeling of cellular concrete.

Study on Evaluation Index of Cold Insulation Performance

2012 ◽  
Vol 516-517 ◽  
pp. 1201-1204
Author(s):  
Hai Qian Zhao ◽  
Zhong Hua Wang ◽  
Xiao Yan Liu ◽  
Zhi Guo Wang
Keyword(s):  
Surface Temperature ◽  
Outer Surface ◽  
Environmental Parameters ◽  
Dew Point ◽  
Evaluation Index ◽  
Point Temperature ◽  
Dew Point Temperature ◽  
Two Temperatures ◽  
The Relationship ◽  
Insulation Performance

The outer surface temperature of cold insulation structure must be higher than air dew point temperature is stipulated in national standard.But the outer surface temperature of cold insulation structure and air dew point temperature normally wave in a certain range with the change of environmental parameters. In Practical application, it is difficult to determine the relationship between these two temperatures. Functional relationship between the outer temperature, air dew point temperature and environmental temperature or humidity is fitted.The influence of the air temperature and humidity is analyzed. Some suggestions about design and evaluation index of cold insulation are offered based on this research.

scholarly journals ANALYSIS OF THE CLIMATIC FEATURES OF THE REGIONS OF THE PRIMARY APPLICATION OF THE SYSTEMS FOR PRODUCING WATER FROM THE ATMOSPHERIC AIR

ScienceRise ◽  
2020 ◽  
Vol 4 ◽  
pp. 3-9
Author(s):  
Eugeniy Osadchuk ◽  
Oleksandr Titlov
Keyword(s):  
Water Resources ◽  
Energy Efficient ◽  
Specific Energy Consumption ◽  
Dew Point ◽  
Winter Period ◽  
Summer Period ◽  
Point Temperature ◽  
Atmospheric Air ◽  
Dew Point Temperature ◽  
Technological Product

The object of research is the thermal and humidity processes occurring during artificial cooling of atmospheric air to the dew point temperature in the evaporators of refrigeration machines of the compression and absorption type. This study solves the problem of finding energy efficient heat and humidity modes for cooling atmospheric air to the dew point temperature in regions with a shortage of water resources and high solar installations. It is shown that practically in all considered climatic zones with a shortage of water resources, the process of obtaining water from atmospheric air is most energetically expended in the winter period of the year, and the most energetically efficient - in the summer period. In the summer period of the year, the specific energy consumption is numerically comparable in the cooling temperature range from 5 °C to 15 °C. It is also shown that the application of the technology of night radiation will create a reserve of natural cold for additional cooling of condensers of refrigerating machines of various types during the entire period of operation. The area of practical use of the research results: compression and absorption refrigeration machines operating in systems for obtaining water from atmospheric air and taking into account seasonal changes in the thermal and humidity parameters of atmospheric air. An innovative technological product: energy-efficient systems for obtaining water from atmospheric air based on refrigeration machines of the compression and absorption type, which also work with the help of solar radiation. Scope of application of the innovative technological product: systems for supplying the population with drinking and process water, mainly in areas with a shortage of water resources.

scholarly journals Towards Modern Technology and Traditional Form—Evolution of the Form of Energy-Efficient Houses in Poland over the Last Decades

Proceedings ◽  
2020 ◽  
Vol 51 (1) ◽  
pp. 30
Author(s):  
Jolanta Owerczuk
Keyword(s):  
Energy Saving ◽  
Energy Efficient ◽  
Building Materials ◽  
New Technologies ◽  
Modern Technology ◽  
Local Conditions ◽  
Traditional Form ◽  
Energy Efficient Buildings ◽  
Country Houses

The article is an attempt to capture the problem of changes occurring in the last dozen or so years in the architecture of energy-efficient houses in Europe, including Poland, in the light of economic and legal conditions. In the studies subordinated to the analysis of the literature, the focus was on those features of energy-efficient buildings that are derived from the logic of solutions of traditional country houses. The genesis of the form of the modern energy-saving house can be found in the principles of building and situating houses developed through the experience of previous generations. These principles took into account the specificity of the climate and existing local conditions. Modern energy-saving construction adds new technologies and new building materials to the traditional form.

scholarly journals The The Occurrence of Thermal Bridges in Hemp-Lime Construction Junctions

2019 ◽  
Author(s):  
Magdalena Grudzińska ◽  
Przemysław Brzyski
Keyword(s):  
Energy Efficient ◽  
Composite Structures ◽  
Building Materials ◽  
Thermal Transmittance ◽  
Timber Frame ◽  
Energy Efficient Buildings ◽  
Moisture Condensation ◽  
Thermal Bridges ◽  
Frame Construction ◽  
Insulating Properties

Thermal bridges increase heat losses in buildings and reduce the temperature of the internal envelope surface, causing moisture condensation and mould growth. This is an important issue for building materials based on organic components such as a hemp-lime composite, as they are particularly susceptible to biological degradation.The hemp-lime composite is used as a filling in timber frame construction. The increased cross-section of wooden elements together with the geometry change in the construction joints can form thermal bridges. The paper presents numerical analyses of temperature distribution in the area of construction elements connections, taking into account several variants of junctions: external walls, corners, and window placement in a wall. The thermal parameters of hemp-lime composites used in the analyses were obtained from the authors’ own research.Despite relatively good insulating properties, timber elements have a noticeable influence on the local increase of the heat transfer in hemp-lime composite structures, forming thermal bridges in the partitions themselves and in the construction nodes. However, the linear thermal transmittance coefficients in the presented joints were not very significant (in the range of 0.026 ÷ 0.092 W/(m·K) depending on the type of connection), proving the usefulness of this type of construction in energy-efficient buildings.

scholarly journals Recent update on the environmental impact of geopolymers

2016 ◽  
Vol 1 ◽  
pp. 17 ◽  
Author(s):  
Guillaume Habert ◽  
Claudiane Ouellet-Plamondon
Keyword(s):  
Energy Source ◽  
Life Cycle ◽  
Environmental Impact ◽  
Energy Efficient ◽  
Major Part ◽  
Building Materials ◽  
Research Trends ◽  
Energy Efficient Buildings ◽  
New Energy ◽  
Alkali Activated

The contribution of building materials’ production to environmental impacts becomes significant in the new energy efficient buildings that are currently built. Among those materials, cement represents a major part of the embodied carbon footprint of buildings. Development of alternatives to traditional Portland cement have emerged over the last decades; however, their environmental assessment over their life cycle have resulted in conflicting results, which give a confusing picture of the strategic path to be followed. This paper focuses on the alkali-activated cement and concrete and points out the variability linked with the choice of energy source for the production of the activators and precursors. A review of existing studies is then performed in order to highlight the main benefits of these alternative cements in terms of reduction of greenhouse gas emissions. Finally, the results presented here highlight further research trends for new cements and concrete.

scholarly journals Preparation and Study of Resin Translucent Concrete Products

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Shen Juan ◽  
Zhou Zhi
Keyword(s):  
Mechanical Properties ◽  
Thermal Performance ◽  
Energy Efficient ◽  
Building Materials ◽  
Plain Concrete ◽  
Area Ratio ◽  
Green Energy ◽  
Light Transmittance ◽  
Energy Efficient Buildings ◽  
New Type

The development of new building materials is a crucial engine for promoting the development of green energy efficient buildings. In this paper, based on the excellent properties of light guiding of resin materials, a new type of resin translucent mortar-based concrete (RTMC) was researched; meanwhile, transmittance properties, mechanical properties, and thermal performance were studied, respectively. The results showed that the resin material possessed excellent light transmittance within the thickness of 100 mm, which can be as high as 93%. Moreover, when the area ratio was within 5%, the compressive strength of RTMC was close to that of plain concrete. Besides, RTMC had excellent thermal performance that the thermal conductivity of RTCM was 0.3815 w/(m·K), which was 60% lower than 0.89 w/(m·K) of plain concrete.

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