A. Ibragimov, Lyubov Y. Gnedina, Svetlana Gerasimova
This article proposes the usage of alternative energy instead of traditional, as safer, and environmentally friendly for the planet and all humankind in the manufacture of monolithic concrete and reinforced concrete products. Monolithic concreting in the conditions of the construction site is now widespread in the construction industry. The subject of the article is considered of the issues of heat treatment of concrete and acceleration of its hardening processes using solar energy. A brief review and classification of the most well-known and common energy sources used to harden acceleration of the concrete mix such as wind power, biofuels, solar energy, alternative hydropower is given. For consideration in the article offers the solar energy – the energy received from solar radiation. The sun as a source is an inexhaustible and affordable type of energy that supplies energy several times higher than traditional sources. In this regard, attention is paid to this field of alternative energy when using it in various spheres of the national economy, especially in the field of construction. Already existing methods of heat treatment of concrete with the help of solar technology are considered, the modern level of development of these methods is defined and further ways of their development are planned. As an example, a physical and mathematical model of a non-stationary heat transfer process in a flat reinforced concrete structure during its heat treatment using solar energy, considering the hydration of cement, is considered. Analytical expressions are obtained that allow us to model the process at any stage and actively intervene and adjust the external parameters to create rational and comfortable conditions for increasing the strength of concrete.
{"title":"The Usage of Solar Power in the Heating Treatment of Concrete","authors":"A. Ibragimov, Lyubov Y. Gnedina, Svetlana Gerasimova","doi":"10.33383/2021-073","DOIUrl":"https://doi.org/10.33383/2021-073","url":null,"abstract":"This article proposes the usage of alternative energy instead of traditional, as safer, and environmentally friendly for the planet and all humankind in the manufacture of monolithic concrete and reinforced concrete products. Monolithic concreting in the conditions of the construction site is now widespread in the construction industry. The subject of the article is considered of the issues of heat treatment of concrete and acceleration of its hardening processes using solar energy. A brief review and classification of the most well-known and common energy sources used to harden acceleration of the concrete mix such as wind power, biofuels, solar energy, alternative hydropower is given. For consideration in the article offers the solar energy – the energy received from solar radiation. The sun as a source is an inexhaustible and affordable type of energy that supplies energy several times higher than traditional sources. In this regard, attention is paid to this field of alternative energy when using it in various spheres of the national economy, especially in the field of construction. Already existing methods of heat treatment of concrete with the help of solar technology are considered, the modern level of development of these methods is defined and further ways of their development are planned. As an example, a physical and mathematical model of a non-stationary heat transfer process in a flat reinforced concrete structure during its heat treatment using solar energy, considering the hydration of cement, is considered. Analytical expressions are obtained that allow us to model the process at any stage and actively intervene and adjust the external parameters to create rational and comfortable conditions for increasing the strength of concrete.","PeriodicalId":49907,"journal":{"name":"Light & Engineering","volume":"6 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87314942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The article describes the analytical expression approximating experimental data on daily natural illuminance on the Earth surface with different types and conditions of cloud cover over the 11-year solar activity cycle within the solar altitude angle range of 0 ° to 90 °. The values of the direct, diffused, and total illuminance on the Earth surface with different types and conditions of the cloud cover and, to some extent, of the substrate were defined and summarised in tables. The data presented may be used as part of the visual perception studies, light and engineering calculations, architecture and construction practice, etc.
{"title":"Analytic Representation of Illuminance on the Earth Surface with Different Types and Conditions of Cloud Cover over the 11-Year Solar Activity Cycle","authors":"A. V. Leonidov","doi":"10.33383/2021-007","DOIUrl":"https://doi.org/10.33383/2021-007","url":null,"abstract":"The article describes the analytical expression approximating experimental data on daily natural illuminance on the Earth surface with different types and conditions of cloud cover over the 11-year solar activity cycle within the solar altitude angle range of 0 ° to 90 °. The values of the direct, diffused, and total illuminance on the Earth surface with different types and conditions of the cloud cover and, to some extent, of the substrate were defined and summarised in tables. The data presented may be used as part of the visual perception studies, light and engineering calculations, architecture and construction practice, etc.","PeriodicalId":49907,"journal":{"name":"Light & Engineering","volume":"42 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90097007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The article is devoted to a wide scale desk and field scientific studies, devoted to a problem of solar insolation of residential buildings and near-by territories. The investigations were conducted on basis of a number of cities in Russian Federation, situated in different insolation zones of country. The different type of residential blocks, as regards to their size, shape, height, etc., was chosen for the studies in question. The lasting of solar insolation period in cardinal standard months of year in relations to the above mentioned factors was determined and this gave a possibility to make a number of general conclusions and to represent some recommendation for architectural and structural design of residential buildings and urban development in general. The article also proves the importance and validity of the latter changes, which were put into the contemporary “Sanitary Codes and Regulations” of Russian Federation in the section on insolation of buildings and territories.
{"title":"Assessment of the Insolation Duration for the Facades of Buildings and Adjacent Territories under Certain Parameters of their Development","authors":"Sergei V. Stetsky, K. Larionova","doi":"10.33383/2021-069","DOIUrl":"https://doi.org/10.33383/2021-069","url":null,"abstract":"The article is devoted to a wide scale desk and field scientific studies, devoted to a problem of solar insolation of residential buildings and near-by territories. The investigations were conducted on basis of a number of cities in Russian Federation, situated in different insolation zones of country. The different type of residential blocks, as regards to their size, shape, height, etc., was chosen for the studies in question. The lasting of solar insolation period in cardinal standard months of year in relations to the above mentioned factors was determined and this gave a possibility to make a number of general conclusions and to represent some recommendation for architectural and structural design of residential buildings and urban development in general. The article also proves the importance and validity of the latter changes, which were put into the contemporary “Sanitary Codes and Regulations” of Russian Federation in the section on insolation of buildings and territories.","PeriodicalId":49907,"journal":{"name":"Light & Engineering","volume":"28 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90169290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Approaches to assessment and standardization of daylighting of residential and public buildings in Russia and abroad are compared. The recommendations for the design of daylighting adopted in the USA, Great Britain, Germany, France, Poland, and Finland, as well as the requirements of the European standard for daylighting are considered. It is emphasized that comparison of domestic experience with foreign experience in terms of environmental design and energy efficiency of buildings can find goals for improving regulatory requirements for daylighting in Russia.
{"title":"Approaches to the Assessment and Regulation of Daylighting in Residential and Public Buildings in Russia and Abroad","authors":"E. Voznesenskaya, Nadezhda I. Dmitrienko","doi":"10.33383/2021-013","DOIUrl":"https://doi.org/10.33383/2021-013","url":null,"abstract":"Approaches to assessment and standardization of daylighting of residential and public buildings in Russia and abroad are compared. The recommendations for the design of daylighting adopted in the USA, Great Britain, Germany, France, Poland, and Finland, as well as the requirements of the European standard for daylighting are considered. It is emphasized that comparison of domestic experience with foreign experience in terms of environmental design and energy efficiency of buildings can find goals for improving regulatory requirements for daylighting in Russia.","PeriodicalId":49907,"journal":{"name":"Light & Engineering","volume":"3 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74712614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Passive use of solar energy for heating buildings in winter and cooling buildings in summer is an environmentally friendly and effective way to save energy in the operation of buildings. In different countries, especially in the middle latitudes, (30–40)% of thermal and electrical energy is consumed for heating and cooling buildings. Therefore, the use of such an inexhaustible source of energy as the sun is relevant. The method of preliminary assessment of the energy efficiency of Trombe walls for buildings in different climatic conditions, based on the energy analysis of the work of these structures in the transition periods of the year (spring – autumn), when the work of the Trombe walls is most effective, is presented. In summer, these structures can be used to activate air exchange with the drawing of cool air from shady and cool areas due to the “chimney” effect. On cold winter days and at night, when there is no sun, the walls of the Trombus act as buffer zones that reduce the temperature load on the enclosing structures. These positive qualities are additional, increasing the energy efficiency of these structures. They are not taken into account in this method. The maximum effect is achieved during the transition period. The results of computational modelling of energy savings due to the use of Trombe walls in areas with a monsoon climate in north-eastern China (Harbin and Shenyang), as well as similar climate areas of the Russian Far East (Khabarovsk and Vladivostok), located at the latitude of the cities under consideration in China, are analysed. It is shown that the efficiency of the use of Trombe walls in the transition period for heating can be up to (10–15)% in these areas. The method of determining the energy efficiency of the use of Trombe walls can be used to determine the feasibility of their use in various climatic regions at the stage of preliminary design and decision-making.
{"title":"Preliminary Assessment of the Energy Efficiency of theTrombe Walls in Buildings with Passive Use of Solar Energy","authors":"A. K. Solovyov, Bi Ruipu, Nguyen Thi Khanh Phuong","doi":"10.33383/2021-075","DOIUrl":"https://doi.org/10.33383/2021-075","url":null,"abstract":"Passive use of solar energy for heating buildings in winter and cooling buildings in summer is an environmentally friendly and effective way to save energy in the operation of buildings. In different countries, especially in the middle latitudes, (30–40)% of thermal and electrical energy is consumed for heating and cooling buildings. Therefore, the use of such an inexhaustible source of energy as the sun is relevant. The method of preliminary assessment of the energy efficiency of Trombe walls for buildings in different climatic conditions, based on the energy analysis of the work of these structures in the transition periods of the year (spring – autumn), when the work of the Trombe walls is most effective, is presented. In summer, these structures can be used to activate air exchange with the drawing of cool air from shady and cool areas due to the “chimney” effect. On cold winter days and at night, when there is no sun, the walls of the Trombus act as buffer zones that reduce the temperature load on the enclosing structures. These positive qualities are additional, increasing the energy efficiency of these structures. They are not taken into account in this method. The maximum effect is achieved during the transition period. The results of computational modelling of energy savings due to the use of Trombe walls in areas with a monsoon climate in north-eastern China (Harbin and Shenyang), as well as similar climate areas of the Russian Far East (Khabarovsk and Vladivostok), located at the latitude of the cities under consideration in China, are analysed. It is shown that the efficiency of the use of Trombe walls in the transition period for heating can be up to (10–15)% in these areas. The method of determining the energy efficiency of the use of Trombe walls can be used to determine the feasibility of their use in various climatic regions at the stage of preliminary design and decision-making.","PeriodicalId":49907,"journal":{"name":"Light & Engineering","volume":"400 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77126741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Currently, insulated glass units (hereinafter abbreviated as IGU) are the main type of translucent filling used in curtain walls. Under the influence of climatic loads in IGU, the thickness of the inter-glass space changes, leading to the deformation of the glasses. Deformations of glass lead to optical distortions on curtain walls. The paper considers the technical solutions used in the existing engineering practice to reduce the distorting curvature of IGU: the use of more rigid external glasses as part of IGU, the use of double-skin facades with external independent single glass, the use of vacuum IGUs. A new method is proposed to reduce the distorting curvature of IGUs by fixing the thickness of the interglass space. It is achieved by installing other point or linear supports between the panes. The introduction of other supports solves the problem of reducing deformations only when IGU is compressed. When the interglass space is expanded, the supports are turned off from operation and the glass is freely deformed. Therefore, to avoid such deflections, it is necessary to pre-compress the IGU under a load equivalent to the climatic load on the IGUs operating in the construction area of the object. Calculations show that for the climatic conditions of the city of Moscow, the required degree of rarefaction the interglass spaces is only 5 % of the absolute atmospheric pressure.
{"title":"A Method of Reducing the Distorting Curvature of Insulated Glass Units Due to Partial Rarefaction in Interglass Space","authors":"A. Plotnikov","doi":"10.33383/2021-071","DOIUrl":"https://doi.org/10.33383/2021-071","url":null,"abstract":"Currently, insulated glass units (hereinafter abbreviated as IGU) are the main type of translucent filling used in curtain walls. Under the influence of climatic loads in IGU, the thickness of the inter-glass space changes, leading to the deformation of the glasses. Deformations of glass lead to optical distortions on curtain walls. The paper considers the technical solutions used in the existing engineering practice to reduce the distorting curvature of IGU: the use of more rigid external glasses as part of IGU, the use of double-skin facades with external independent single glass, the use of vacuum IGUs. A new method is proposed to reduce the distorting curvature of IGUs by fixing the thickness of the interglass space. It is achieved by installing other point or linear supports between the panes. The introduction of other supports solves the problem of reducing deformations only when IGU is compressed. When the interglass space is expanded, the supports are turned off from operation and the glass is freely deformed. Therefore, to avoid such deflections, it is necessary to pre-compress the IGU under a load equivalent to the climatic load on the IGUs operating in the construction area of the object. Calculations show that for the climatic conditions of the city of Moscow, the required degree of rarefaction the interglass spaces is only 5 % of the absolute atmospheric pressure.","PeriodicalId":49907,"journal":{"name":"Light & Engineering","volume":"16 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85139275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The works on degradation of light emitting diodes (LEDs) with quantum wells (QW) were analysed. The calculation model of the relation between LED luminous flux and duration of LED current flow and current density was proposed. It allows us to forecast service life of such radiators with the pre-set electric modes and temperature. It is demonstrated that: – Reduction of quantum yield of LED with QW based on high-bandgap semiconductors with longterm flow of forward current occurs due to generation of point defects in the QW areas; – The dot defects occur as a result of interaction between hot electrons and semiconductor atoms caused by subthreshold displacement out of the lattice dots; – The dot defects create non-radiative recombination centres with particular concentration in the energy gap of a semiconductor, as a result of which intensities of recombination flows in QWs and in barriers between QWs redistribute towards the non-radiative component of the ABC model.
{"title":"The Regularity of the Decrease in the Quantum Yield of Quantum-Wells LEDs at the Long-Term Current Flow from the ABC Model Position","authors":"F. Manyakhin, L. Mokretsova","doi":"10.33383/2021-010","DOIUrl":"https://doi.org/10.33383/2021-010","url":null,"abstract":"The works on degradation of light emitting diodes (LEDs) with quantum wells (QW) were analysed. The calculation model of the relation between LED luminous flux and duration of LED current flow and current density was proposed. It allows us to forecast service life of such radiators with the pre-set electric modes and temperature. It is demonstrated that:\u0000– Reduction of quantum yield of LED with QW based on high-bandgap semiconductors with longterm flow of forward current occurs due to generation of point defects in the QW areas;\u0000– The dot defects occur as a result of interaction between hot electrons and semiconductor atoms caused by subthreshold displacement out of the lattice dots;\u0000– The dot defects create non-radiative recombination centres with particular concentration in the energy gap of a semiconductor, as a result of which intensities of recombination flows in QWs and in barriers between QWs redistribute towards the non-radiative component of the ABC model.","PeriodicalId":49907,"journal":{"name":"Light & Engineering","volume":"109 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80896192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The article is devoted to luminaires and the history of the development of artificial illumination. As you know, light is one of the human needs. At all stages of the development of human civilization, people have thought about how to use artificial light source if there is not enough daylight. That is why man constantly invented and improved certain light source, the framings of which we now call lighting device or luminaires. The stages of development and improvement of luminaires are a matter of separate serious scientific research. In this article, we are talking about how the development of lighting devices took place in different periods. In different epochs, luminaires corresponded to certain traditions and aesthetic views of certain architectural styles. That is why in his article the author pays great attention not only to the appearance of the described luminaires, but also to its architectural environment.
{"title":"Luminaires and the History of the Development of Artificial Lighting in Russia","authors":"K. Solovyov","doi":"10.33383/2021-077","DOIUrl":"https://doi.org/10.33383/2021-077","url":null,"abstract":"The article is devoted to luminaires and the history of the development of artificial illumination. As you know, light is one of the human needs. At all stages of the development of human civilization, people have thought about how to use artificial light source if there is not enough daylight. That is why man constantly invented and improved certain light source, the framings of which we now call lighting device or luminaires. The stages of development and improvement of luminaires are a matter of separate serious scientific research. In this article, we are talking about how the development of lighting devices took place in different periods. In different epochs, luminaires corresponded to certain traditions and aesthetic views of certain architectural styles. That is why in his article the author pays great attention not only to the appearance of the described luminaires, but also to its architectural environment.","PeriodicalId":49907,"journal":{"name":"Light & Engineering","volume":"119 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77457125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The research of holographic optical elements (HOE) was carried out very intensively in the 1980s and 1990s. They provided great advantages in high-efficiency natural light, while at the same time providing effective sun protection and did not disturb the free view from the windows. The light-directing qualities of these devices made it possible to concentrate direct and scattered solar energy on photovoltaic batteries and solar collectors for hot water supply and solar heating. However, in recent years, research in this area has become less and less frequent without any explanation. The analysis of the research carried out in the framework of one of the latest projects carried out on behalf of the European Commission under the program “Energy, Environment, and Sustainable Development” (EU Contract Number: ENK6-CT‑2000–00327) with the participation of nine research organizations, higher schools, and universities is presented. The role of each of the participants in this interdisciplinary project was to attract experienced researchers in various fields of science and use their knowledge to obtain an objective result.
{"title":"Holographic Optical Elements: Advantages and Disadvantages for Efficient Lighting, Sun Protection, and Photovoltaic Power Supply of Buildings","authors":"A. K. Solovyov, Hong-Tham T. Pham","doi":"10.33383/2021-076","DOIUrl":"https://doi.org/10.33383/2021-076","url":null,"abstract":"The research of holographic optical elements (HOE) was carried out very intensively in the 1980s and 1990s. They provided great advantages in high-efficiency natural light, while at the same time providing effective sun protection and did not disturb the free view from the windows. The light-directing qualities of these devices made it possible to concentrate direct and scattered solar energy on photovoltaic batteries and solar collectors for hot water supply and solar heating. However, in recent years, research in this area has become less and less frequent without any explanation. The analysis of the research carried out in the framework of one of the latest projects carried out on behalf of the European Commission under the program “Energy, Environment, and Sustainable Development” (EU Contract Number: ENK6-CT‑2000–00327) with the participation of nine research organizations, higher schools, and universities is presented. The role of each of the participants in this interdisciplinary project was to attract experienced researchers in various fields of science and use their knowledge to obtain an objective result.","PeriodicalId":49907,"journal":{"name":"Light & Engineering","volume":"23 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76714940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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