OPTIMIZATION OF HEAT-SHIELDING CHARACTERISTICS OF THE EXTERIOR WALLS OF COUNTRY COTTAGES, INSULATED WITH MONOLITHIC FOAM CONCRETE

2018 ◽  
Vol 8 (3) ◽  
pp. 22-25
Author(s):  
Yury S. VYTCHIKOV ◽  
Mikhail Ye. SAPAREV ◽  
Vladislav A. GOLIKOV
Keyword(s):  
Heat Transfer ◽  
Outer Wall ◽  
Heating Time ◽  
Exterior Wall ◽  
Foam Concrete ◽  
Transfer Resistance ◽  
Warm Up ◽  
Shielding Properties ◽  
Heat Shielding ◽  
Resistance To Heat

The heat-shielding properties of three-layer external walls insulated with monolithic foam concrete are considered in the article. The temperature is given in rooms operated in intermitt ent heating conditions. An optimal exterior wall design is proposed using monolithic foam concrete for the construction of country cott ages. For this design, the results of heat engineering calculations are presented using the analytical dependence of determining the heat transfer resistance, which ensures the minimum warm-up time of the wall. The results of the calculation are presented in tabular form for a given heating time and density of foam concrete. Also a relationship is described to determine the maximum allowable resistance to heat transfer of the outer wall at diff erent densities of monolithic foam concrete.

scholarly journals USE OF MONOLITHIC FOAM CONCRETE IN ENCLOSING STRUCTURES OF BUILDINGS AND STRUCTURES WITH VARIABLE THERMAL CONDITIONS

2018 ◽  
Vol 8 (4) ◽  
pp. 10-14 ◽  
Author(s):  
Yury S. VYTCHIKOV ◽  
Mikhail Ye. SAPAREV ◽  
Vladislav A. GOLIKOV
Keyword(s):  
Heat Transfer ◽  
Thermal Conditions ◽  
Outer Wall ◽  
Engineering Calculation ◽  
Heating Time ◽  
Thermal Engineering ◽  
Foam Concrete ◽  
Insulating Layer ◽  
Optimum Range ◽  
Resistance To Heat

This article considers the features of the use of monolithic foam concrete as a heat-insulating layer in the building enveloping structures of buildings operated under intermitt ent heating conditions. To assess the eff ectiveness of the use of monolithic foam concrete in building enveloping structures, a thermal engineering calculation of the outer wall, insulated with the use of monolithic foam concrete, was carried out. Based on the calculations carried out by the authors, graphs of the dependence of the heating time of multilayered enclosing structures on the thickness of the heat-insulating layer and the reduced resistance to heat transfer of the structure were obtained. The optimum range of thicknesses and densities of monolithic foam concrete for thermal insulation of external walls of buildings, operated in conditions of intermitt ent heating, is off ered. This calculation also showed that the use of foam concrete as a heater from the inside of the outer wall can reduce the load on the foundation of the building.

scholarly journals CHANGES IN LIGHTING STANDARDS AND THEIR INFLUENCE ON THE ARCHITECTURE AND ENERGY EFFICIENCY OF MODERN RESIDENTIAL BUILDINGS

2020 ◽  
pp. 9-17
Author(s):  
E.V. Vitvitskaya ◽  
◽  
D.V. Tarasevich ◽  
Keyword(s):  
Heat Transfer ◽  
Energy Efficiency ◽  
Energy Savings ◽  
Residential Buildings ◽  
Residential Building ◽  
High Heat ◽  
Transfer Resistance ◽  
Heating And Cooling ◽  
Shielding Properties ◽  
Heat Shielding

Abstract. State regulations on the design of lighting in residential buildings in recent years have undergone significant changes, which in turn will significantly affect the architecture and energy efficiency of modern buildings of this type. This can be observed from the authors' analysis of the change in only one regulatory document given in this article – SCS (State Construction Standards) V.2.5-28: «Natural and artificial lighting» and only one lighting indicator: permissible deviation of the calculated value of CNL (coefficient of natural lighting) from the standardized value when choosing translucent structures of buildings. This article presents an analysis of this normative document in two versions – in the old one from 2012 and new from 2018. Based on the results of the analysis, the authors of this article found that, at the request of the architect, the area of translucent structures on the facades of two identical modern residential buildings can differ significantly: from the minimum with piece (separate) windows on the facades – where glazing occupies from 14.3% to 18.3% of the area of the facades; up to maximum with continuous glazing of facades – where glazing occupies up to 100% of the area of the facades of a residential building. These two facade glazing options are not only architecturally perceived differently, but they must also have different energy efficiency in order to provide different minimum allowable values of heat transfer resistance: for piece (individual) windows on the facade, this is R∑ ≥ Rq min = 0.6 m2•K/W and ordinary silicate glasses are suitable for their glazing, and for continuous glazing of the facade this should already be R∑ ≥ Rq min = 2.8 m2•K/W, that is, they must have the same heat-shielding properties as the outer walls, and their minimum allowable value of the heat transfer resistance must be 4.66 times more than for piece (separate) windows. For this option, ordinary silicate glass is no longer suitable, but modern glass-transparent structures with high heat-shielding properties should be used, for example Qbiss_Air, Pilkington, Heat Mirror Glass and others. They provide excellent protection against hypothermia in winter and overheating in summer, and have good sun protection properties. Their use in modern buildings contributes to energy savings for heating and cooling rooms throughout the year and creates increased comfort, but such translucent structures are much more expensive and better suited for elite housing construction than for social.

scholarly journals DETERMINATION OF THE OPTIMAL PARAMETERS OF THE HEAT-SHIELDING PROPERTIES OF NATURAL AND SYNTHETIC FILLERS FOR CHILDREN'S OUTERWEAR PRODUCTION

2019 ◽  
pp. 170-180
Author(s):  
Iraida Dudla ◽  
◽  
Olena Khrebtan ◽  
Keyword(s):  
Heat Transfer ◽  
Surface Density ◽  
Optimal Parameters ◽  
Target Setting ◽  
Textile Materials ◽  
Mathematical Equations ◽  
Shielding Properties ◽  
Heat Shielding ◽  
Natural And Synthetic

Urgency of the research. The main functional property of children's outerwear is a heat-shielding property. The research of the heat-shielding properties of natural and synthetic fillers for children's outerwear production is quite multifaceted, complex and insufficiently studied question. This is due to the fact that for the manufacture of children's outerwear new fabrics for the top and lining, as well as fillers of various materials are used. Target setting. Determination of the optimal parameters of the heat-shielding properties of natural and synthetic fillers for children's outerwear production is an important task, since the greatest value of clothing is for the processes of heat exchange of the human body with the environment and to ensure normal thermoregulation. Actual scientific researches and issues analysis. Considerable attention has been paid to the prediction of the heatprotective properties of winter clothing or its construction, the substantiation of the choice of a package of materials for the manufacture of children's outerwear, mathematical modelling of the heat transfer through textile materials and to the physical model of thermal resistance determination. Uninvestigated parts of general matters defining. The heat-shielding properties of natural and synthetic fillers for the outerwear of children are practically not studied, and the calculations of the optimal parameters of these properties are fragmentary. The research objective. to determine the optimal parameters of the heat-shielding properties of natural and synthetic fillers for children's outerwear production. The statement of basic materials. It was found that the heat-shielding properties of children's jackets with feather-down and synthetic textile filler depend on the type of filler, thickness, surface density and breathability of the clothing package. Conclusions. Children's jackets with feather-down filler with a smaller thickness have the lowest level of breathability, which provides them with the best heat-shielding properties. The higher level of breathability inherent in a children's jacket with synthetic textile filler with a significantly greater thickness of the package can provide high levels of the heat-shielding properties. Mathematical equations to determine the optimal parameters of the heat-shielding properties of natural and synthetic fillers for children's outerwear production are suggested.

scholarly journals Proposals for standardization the heat transfer resistance of insulated walls of residential buildings in the Republic of Belarus

Vestnik MGSU ◽  
2021 ◽  
pp. 828-837
Author(s):  
Vyacheslav N. Chernoivan ◽  
Anna V. Torkhova ◽  
Nikolay V. Chernoivan ◽  
Vladimir G. Novoseltsev
Keyword(s):  
Heat Transfer ◽  
Residential Buildings ◽  
Outdoor Air ◽  
Heating Season ◽  
Main Criterion ◽  
Transfer Resistance ◽  
Air Temperatures ◽  
Urgent Task ◽  
The Republic ◽  
Resistance To Heat

Introduction. Resistance to heat transfer is considered the main criterion of energy operational efficiency in the design of enclosing structures of buildings and structures. Therefore, the calculation of the values of the normalized resistance to heat transfer, for each locality of the Republic of Belarus, taking into account the actual outdoor temperatures and the duration of the heating season is an urgent task. Materials and methods. To assess the energy efficiency of enclosing structures, the value of annual heat losses Q, kWh/m2, through 1 m2 of the structure was adopted. The calculation of the values of the normalized heat transfer resistance for each locality of the Republic of Belarus, taking into account the actual outdoor air temperatures and the duration of the heating season, was carried out according to the method recommended by V.G. Gagarin. A comparative analysis of the results obtained according to the methods recommended by TCP 45-2.04-196-2010* and SP 50.13330.2012 is carried out. Results. The calculations determine the values of the normalized heat transfer resistance for each locality of the Republic of Belarus, taking into account the actual outdoor air temperatures during the heating period and the duration of the heating season. To facilitate the design of insulated walls, a map of the recommended (calculated) values of the heat transfer resistance of the external walls of residential buildings for the territory of the Republic of Belarus is constructed. Conclusions. According to the results of the performed studies, it was found that the economic efficiency in the design of insulated walls according to the method recommended by TCP 45-2.04-196-2010*, depending on the region of the Republic of Belarus for which the design is being carried out, is on average from 6 to 8 BYN per 1 m2 of insulated wall.

scholarly journals Application of monolithic foam concrete in building envelopes of a cottage, used in conditions of intermittent heating

2018 ◽  
Vol 196 ◽  
pp. 04015 ◽  
Author(s):  
Yuri Vytchikov ◽  
Mikhail Saparev ◽  
Vladislav Golikov
Keyword(s):  
Specific Energy Consumption ◽  
Thermal Characteristics ◽  
Outer Wall ◽  
Heating Time ◽  
Review Literature ◽  
Building Envelope ◽  
Foam Concrete ◽  
Building Envelopes ◽  
Insulating Layer ◽  
Intermittent Heating

The paper focuses upon the peculiarities of application of monolithic foam concrete as a heat-insulating layer in building envelopes of houses used in conditions of intermittent heating. The researchers analyze thermal characteristics, review literature describing the application of foam concrete in construction and demonstrate this material applicability at outer walls insulating, taking buildings and constructions with variable thermal behaviour as an example. The paper outlines main criteria that building envelopes of such structures should meet. To assess the effectiveness of monolithic foam concrete in building envelopes application, the authors carried out thermo-technical calculation of the outer walls, insulated with monolithic foam concrete. The graphs of dependence of multilayer building envelope heating time upon thickness of a heat-insulating layer and upon heat transmission resistance of the construction was obtained on the basis of these calculations. The dependence of specific energy consumption upon the heating time is also given in the paper. The study reveals the optimal range of thickness and density of monolithic foam concrete for insulating outer walls of buildings, used in in conditions of intermittent heating. This calculation also proves that the application of foam concrete as an insulant on the inside of the outer wall makes it possible to reduce the load on the building foundation.

Retaining Structure Design and Residential Energy-Saving Research

2012 ◽  
Vol 430-432 ◽  
pp. 466-469
Author(s):  
Jun Zhou Huang ◽  
Jian Hua Wang
Keyword(s):  
Heat Transfer ◽  
Energy Consumption ◽  
Energy Saving ◽  
Residential Building ◽  
Outer Wall ◽  
Structure Design ◽  
Residential Energy ◽  
Transfer Resistance ◽  
Retaining Structure ◽  
Thermal Bridge

Based on the theories, , and we can improve , the heat transfer resistance of retaining structure, or reduce ,the heat transfer coefficient, through the heat insulation design of outer wall, roof, ground, the door, and outer window and the thermal bridge, and finally realize the building energy conservation goals. Residential energy consumption is a important factor of China's energy saving. Exterior wall, roof, ground, the door, the external window and thermal bridge is the key parts of energy consumption of residential building.

scholarly journals AUTOMATION OF CALCULATION OF HEAT-SHIELDING CHARACTERISTICS OF WINDOWS

2021 ◽  
Vol 9 (4) ◽  
pp. 81-85
Author(s):  
Ol'ga Baranova ◽  
Kseniya Kurushkina
Keyword(s):  
Heat Transfer ◽  
Visual Programming ◽  
Information Modeling ◽  
Design Stage ◽  
Building Structures ◽  
Modeling Tools ◽  
Transfer Resistance ◽  
Programming Tool ◽  
Heat Shielding ◽  
Capital Construction

The use of information modeling tools at all stages of the life cycle of a capital construction object allows you to analyze design information in order to make the most correct decision, while significantly reducing the uncertainty of processes by increasing the amount of data available for analysis. One of the labor-intensive processes at the design stage is the selection of the most suitable structural elements, including translucent structures. As part of the work, the normative and reference information related to the calculation of the heat-shielding characteristics of building structures has been analyzed, scientific developments and publications devoted to the automation of the implementation of heat engineering calculations using various software tools are considered. For the purpose of the study, two indicators were calculated: the normalized value of the reduced heat transfer resistance and the reduced heat transfer resistance of the window. To solve the problem, such automation tools as the Dynamo visual programming tool and the Python programming language were used, with the help of which a script was developed for calculating the thermal performance of windows for use in Autodesk Revit (Autodesk, Inc., USA). As part of the study, it was determined that the combined use of the Dynamo visual programming tool and the Python text programming tool, expanding the functionality of Autodesk Revit, made it possible to automate the task of calculating the reduced heat transfer resistance of a window and the normalized heat transfer resistance, taking into account conditions of a specific construction region.

scholarly journals DETERMINATION OF HEAT TRANSFER RESISTANCE IN NON-STATIONARY THERMAL CONDITIONS

2020 ◽  
Vol 22 (6) ◽  
pp. 83-93
Author(s):  
A. N. Belous ◽  
G. A. Kotov ◽  
D. A. Sapronov ◽  
B. A. Novikov
Keyword(s):  
Heat Transfer ◽  
Real Estate ◽  
Thermal Characteristics ◽  
Thermal Conditions ◽  
Full Scale ◽  
Transfer Resistance ◽  
Advantages And Disadvantages ◽  
Fundamental Research ◽  
Cis Countries ◽  
Resistance To Heat

One of the main normalized heat engineering indicators of enclosing structures is the resistance to heat transfer. On the territory of the CIS countries there are a huge number of real estate objects designed and built in accordance with outdated standards for the consumption of heat energy for heating and ventilation, requirements for the heat-protective shell of buildings, which leads to energy overspending. All real estate objects put into operation before the tightening of the above-mentioned standards require determining the actual thermal characteristics of the enclosing structures and bringing them into compliance with the current legislation. The article analyzes existing methods for determining the heat transfer resistance of enclosing structures in full-scale conditions, and identifies the advantages and disadvantages of these methods. Based on the fundamental research of construction Thermophysics, a mathematical model for determining the resistance to heat transfer in full-scale conditions is proposed, taking into account the shortcomings of existing methods.

scholarly journals OPTIMIZATION OF HEAT PROTECTION CHARACTERISTICS OF COUNTRY COTTAGE ENCLOSURES

2021 ◽  
Vol 11 (1) ◽  
pp. 39-45
Author(s):  
Yuri S. VYTCHIKOV ◽  
Mikhail E. SAPAREV ◽  
Vladislav A. GOLIKOV ◽  
Evgeniy G. SAFRONOV
Keyword(s):  
Heat Transfer ◽  
Energy Consumption ◽  
Thermal Protection ◽  
Minimum Energy ◽  
Thermal Conditions ◽  
Outer Wall ◽  
Wall Material ◽  
Transfer Resistance ◽  
Heating Systems ◽  
Minimum Energy Consumption

The article presents a method for determining the minimum permissible value of the heat transfer resistance of the outer wall, at which the minimum energy consumption is achieved during the operation of buildings with variable thermal conditions. A review of the sources devoted to this problem showed the presence of high costs of thermal energy during the heating of premises. On the basis of studies of all components of energy consumption in the operation of premises with intermitt ent heating systems, the authors of the article propose a method for determining the minimum permissible resistance to heat transfer, which provides minimum energy consumption. According to the described method, the calculation was made for external walls made of various materials. The analysis of the obtained results showed that a signifi cant infl uence on the minimum permissible value of the heat transfer resistance is exerted by a complex of thermophysical values cρλ. The presented graphical dependence R0 усл on the complex cρλ allows the designer to rationally choose a wall material that provides a minimum of energy consumption during the operation of the building. In the context of rising energy tariff s, such optimization of thermal protection characteristics is especially important for country cott ages operated in intermitt ent heating conditions.

scholarly journals Moisture transfer in outer walls with layers of different density

2021 ◽  
Vol 327 ◽  
pp. 01005
Author(s):  
Andrey Rymarov ◽  
Dmitriy Titkov ◽  
Aleksey Ananiev
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Water Vapor ◽  
Building Materials ◽  
Moisture Transfer ◽  
Outer Wall ◽  
Vapor Permeability ◽  
Layer By Layer ◽  
Transfer Resistance ◽  
Concrete Blocks

The need to protect external walls from excess moisture to improve heat-shielding properties is an urgent task. If the outer wall is created from expanded clay concrete blocks, then the most interesting are the blocks created by layer-by-layer moulding, in which each layer can have its own given density. In such blocks, each layer has its own coefficients of thermal conductivity and vapor permeability, which allows you to select the required heat transfer resistance and vapor permeability of the outer wall for a specific region, taking into account the characteristics of the climate. The ability to have external walls with different material densities inside makes it possible to implement energy saving tasks in the building. The article discusses options for external walls made of expanded clay concrete blocks with layers with different densities and coefficients of thermal conductivity and vapor permeability. Changing the location of layers with different densities inside the blocks changes the local values of the vapor permeability resistance, which leads to a different nature of the movement of water vapor inside the wall in winter. It is good when water vapor does not accumulate in the wall; it does not condense and freely goes into the external environment. A dry wall is more durable, it loses less heat in winter. Changes in partial pressures at full saturation and with existing humidity inside the expanded clay concrete block for layers of different densities in winter are considered to determine the possible condensation from water vapor inside the wall. Layer-by-layer moulding of building materials improves their properties to increase resistance to heat transfer and to form a dry and more durable outer wall.

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