Pub Date : 2023-11-03DOI: 10.32347/2409-2606.2023.45.5-20
Vadym Korbut, T. Tkachenko, V. Mileikovskyi, V. Vakhula, V. Konovaliuk
Today, the creation of optimal microclimatic conditions is mandatory for the vast majority of premises in public buildings. The main problem in the cooling period of the year is the minimization of energy consumption. Traditional systems with recirculation require the return of exhaust air to the ventilation unit, which is obviously accompanied by additional energy costs for its movement. In addition, this enlarges air handling units, airducts and other equipment. This problem is not present in ventilation systems with local cooling. They consist of a ventilation system that provides a minimum flow of outdoor air and local closers that take air from the upper or middle zone, cool it and supply it to the room. The work considers the principles of analytical description of processes in a room with the simultaneous operation of ventilation and local cooling. A calculation algorithm and a software based on it have been created. The basis of the analytical description is the simplification that the supply air and the air after the closers are first mixed, and then the mixture participates in the assimilation of excess heat and moisture in the room. The influence of various factors on the productivity and cold performance of the guides is analyzed. It is shown that for maximum energy efficiency with minimum costs, it is necessary to perform the calculation, and not to use aggregated indicators. It is shown that the performance of the closers can exceed the consumption of outside air. The closers return the exhausted air to the working area, which leads to an increase in the carbon dioxide content in it and the possibility of the return of pathogenic microorganisms and viruses to it. It is shown how both problems are solved by a biotechnological measure - remedial phytodesign. The recommended assortment of plants is given.
{"title":"Analytical studies of the functioning of ventilation with local cooling in public buildings","authors":"Vadym Korbut, T. Tkachenko, V. Mileikovskyi, V. Vakhula, V. Konovaliuk","doi":"10.32347/2409-2606.2023.45.5-20","DOIUrl":"https://doi.org/10.32347/2409-2606.2023.45.5-20","url":null,"abstract":"Today, the creation of optimal microclimatic conditions is mandatory for the vast majority of premises in public buildings. The main problem in the cooling period of the year is the minimization of energy consumption. Traditional systems with recirculation require the return of exhaust air to the ventilation unit, which is obviously accompanied by additional energy costs for its movement. In addition, this enlarges air handling units, airducts and other equipment. This problem is not present in ventilation systems with local cooling. They consist of a ventilation system that provides a minimum flow of outdoor air and local closers that take air from the upper or middle zone, cool it and supply it to the room. The work considers the principles of analytical description of processes in a room with the simultaneous operation of ventilation and local cooling. A calculation algorithm and a software based on it have been created. The basis of the analytical description is the simplification that the supply air and the air after the closers are first mixed, and then the mixture participates in the assimilation of excess heat and moisture in the room. The influence of various factors on the productivity and cold performance of the guides is analyzed. It is shown that for maximum energy efficiency with minimum costs, it is necessary to perform the calculation, and not to use aggregated indicators. It is shown that the performance of the closers can exceed the consumption of outside air. The closers return the exhausted air to the working area, which leads to an increase in the carbon dioxide content in it and the possibility of the return of pathogenic microorganisms and viruses to it. It is shown how both problems are solved by a biotechnological measure - remedial phytodesign. The recommended assortment of plants is given.","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139290089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-03DOI: 10.32347/2409-2606.2023.45.36-41
Illja Devterov, Petro Zinych
The current state of energy supply of civil engineering systems in Ukraine and resources that can be developed and used to increase energy efficiency and energy independence are investigated in the work based on a systemic approach, analysis and synthesis of important questions on the research topic, as well as the method of observation, measurement, formalization and generalization countries in the conditions of the globalization of the world economy, as well as the integration of artificial intelligence systems and neural networks in all spheres of life. The relevance of the research lies in Ukraine's desire for energy independence and energy efficiency of existing systems, modernization of energy supply systems, which are already outdated and have low efficiency and efficiency. Further ways of improving and optimizing the energy supply of civil engineering systems in Ukraine are being researched, and their feasibility is proven. It is concluded that understanding the importance of these issues will lead to energy independence and energy security of the country as a whole, as well as an increase in the volume of civil construction and energy renovation of civil buildings. Special attention is paid to RES, which are already used in Ukraine, are quite energy-efficient and preserve the environment, which increases the country's competitiveness in the world energy supply market, as well as the production of many goods and services that are relevant today. Leading experts in the field of civil engineering and energy consider the development of renewable energy sources (RES) as one of the most important ways to energy independence of Ukraine and the development of civil engineering systems, the needs of which are growing along with the construction of new consumer facilities. The further development of this work consists in the targeted monitoring of problematic links of the modern energy supply system and the implementation of the latest developments of domestic and foreign specialists, which are already available today and allow to significantly reduce the percentage of energy costs in all areas of energy supply stem of civil engineering.
{"title":"Development of energy supply civil engineering system in Ukraine","authors":"Illja Devterov, Petro Zinych","doi":"10.32347/2409-2606.2023.45.36-41","DOIUrl":"https://doi.org/10.32347/2409-2606.2023.45.36-41","url":null,"abstract":"The current state of energy supply of civil engineering systems in Ukraine and resources that can be developed and used to increase energy efficiency and energy independence are investigated in the work based on a systemic approach, analysis and synthesis of important questions on the research topic, as well as the method of observation, measurement, formalization and generalization countries in the conditions of the globalization of the world economy, as well as the integration of artificial intelligence systems and neural networks in all spheres of life. The relevance of the research lies in Ukraine's desire for energy independence and energy efficiency of existing systems, modernization of energy supply systems, which are already outdated and have low efficiency and efficiency. Further ways of improving and optimizing the energy supply of civil engineering systems in Ukraine are being researched, and their feasibility is proven. It is concluded that understanding the importance of these issues will lead to energy independence and energy security of the country as a whole, as well as an increase in the volume of civil construction and energy renovation of civil buildings. Special attention is paid to RES, which are already used in Ukraine, are quite energy-efficient and preserve the environment, which increases the country's competitiveness in the world energy supply market, as well as the production of many goods and services that are relevant today. Leading experts in the field of civil engineering and energy consider the development of renewable energy sources (RES) as one of the most important ways to energy independence of Ukraine and the development of civil engineering systems, the needs of which are growing along with the construction of new consumer facilities. The further development of this work consists in the targeted monitoring of problematic links of the modern energy supply system and the implementation of the latest developments of domestic and foreign specialists, which are already available today and allow to significantly reduce the percentage of energy costs in all areas of energy supply stem of civil engineering.","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"137 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139289880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-03DOI: 10.32347/2409-2606.2023.45.42-51
O. Pohosov, N. Chepurna, P. Pasichnyk, E. Kulinko, A. Doroshenko
Steam supply systems of industrial enterprises, as a type of heat supply system, are a large consumer of primary energy in national energy balances. In turn, due to the specificity of thermodynamic steam processes, steam supply systems of industrial enterprises in practice have significant unused potential of secondary energy resources (SEP). Modern steam supply systems should be built exclusively when evaluating their exergetic efficiency, which will make it possible to evaluate the effectiveness of such systems grossly in all elements of the life cycle of the project: energy, economic, ecological and even social. The article shows modernized thermal schemes of steam supply systems, for which it is possible to achieve additional electrical power at the level of 135-250 kW/(kg/s) when devices with a relative internal efficiency of up to 60-70 % are operating. In combination with an increase in the percentage of condensate return and the utilization of secondary energy resources (SRP), the increase in energy efficiency of the system is 2-4 %, and the absolute value of exergetic efficiency is 16-22 %, taking into account the exergetic efficiency of the boiler unit. Low-potential "tail" consumers: the heating system, the hot water supply system - increase the exergy efficiency of the steam supply system of an industrial enterprise by 0.2-0.6 % in the case of joining on the steam side of secondary boiling. Any processes of generating electrical energy are associated with obtaining a significant amount of thermal energy, and must be accompanied by its utilization; enterprises that use steam as an energy carrier (the same applies to energy enterprises such as thermal power plants and nuclear power plants) for the deep utilization of hydroelectric power plants must have thermal energy consumers in their composition, which can act as communal household consumers (if they exist), as well as new technological consumers of thermal energy.
{"title":"Моdern heat and steam supply systems of industrial enterprises using deep utilization of the technological steam energy potential","authors":"O. Pohosov, N. Chepurna, P. Pasichnyk, E. Kulinko, A. Doroshenko","doi":"10.32347/2409-2606.2023.45.42-51","DOIUrl":"https://doi.org/10.32347/2409-2606.2023.45.42-51","url":null,"abstract":"Steam supply systems of industrial enterprises, as a type of heat supply system, are a large consumer of primary energy in national energy balances. In turn, due to the specificity of thermodynamic steam processes, steam supply systems of industrial enterprises in practice have significant unused potential of secondary energy resources (SEP). Modern steam supply systems should be built exclusively when evaluating their exergetic efficiency, which will make it possible to evaluate the effectiveness of such systems grossly in all elements of the life cycle of the project: energy, economic, ecological and even social. The article shows modernized thermal schemes of steam supply systems, for which it is possible to achieve additional electrical power at the level of 135-250 kW/(kg/s) when devices with a relative internal efficiency of up to 60-70 % are operating. In combination with an increase in the percentage of condensate return and the utilization of secondary energy resources (SRP), the increase in energy efficiency of the system is 2-4 %, and the absolute value of exergetic efficiency is 16-22 %, taking into account the exergetic efficiency of the boiler unit. Low-potential \"tail\" consumers: the heating system, the hot water supply system - increase the exergy efficiency of the steam supply system of an industrial enterprise by 0.2-0.6 % in the case of joining on the steam side of secondary boiling. Any processes of generating electrical energy are associated with obtaining a significant amount of thermal energy, and must be accompanied by its utilization; enterprises that use steam as an energy carrier (the same applies to energy enterprises such as thermal power plants and nuclear power plants) for the deep utilization of hydroelectric power plants must have thermal energy consumers in their composition, which can act as communal household consumers (if they exist), as well as new technological consumers of thermal energy.","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139289822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-03DOI: 10.32347/2409-2606.2023.45.29-35
V. Nalyvaiko, V. Konovaliuk
The intensification of the processes of mining and processing of mineral raw materials, characteristic of the modern development of mining production, is associated with significant dust pollution of the atmospheric air. As an economical and mobile means of dust suppression, it is recommended to use the developed impulse fine-dispersed irrigation system "Ustimor". The principle of operation of the installation is based on the pulsed displacement of water from the water-air tank by the combustion products of the fuel-air mixture under high pressure (>5 MPa). Experimental and industrial tests of the installation were carried out at the tailings storage facility of PJSC "Ingulets Mining and Processing Plant". The range of the installation is on average 120-130 m. The area of the irrigated surface in one cycle of operation is from 500 m2 to 750 m2. Fine spraying was observed along the entire length of the jet flight. In one hour of operation, the installation can release from 5 to 30 tons of water into the atmosphere in the form of drizzle. The intensity of watering for one work cycle is on average 0.85 l/m2. The possibility of autonomous operation of the installation and its remote control through the SCADA system has been confirmed. The installation of pulse fine-dispersed irrigation is recommended for use as a means of spraying liquid by the method of fine-dispersed irrigation on open areas of surfaces where dust is intensively swept and suspended. It can be used for dust suppression and humidification at tailings storage facilities, warehouses of bulk materials, landfills, technological highways. The "Ustimor" installation can also be used for fine-dispersed irrigation of plantations, vineyards, gardens, etc. Irrigation of leaf cover and soil surface will lower their temperature by 7 - 10 °C in the sun and by 6 - 6.6 °C in the shade.
{"title":"Development of a multifunctional installation of fine dispersed irrigation","authors":"V. Nalyvaiko, V. Konovaliuk","doi":"10.32347/2409-2606.2023.45.29-35","DOIUrl":"https://doi.org/10.32347/2409-2606.2023.45.29-35","url":null,"abstract":"The intensification of the processes of mining and processing of mineral raw materials, characteristic of the modern development of mining production, is associated with significant dust pollution of the atmospheric air. As an economical and mobile means of dust suppression, it is recommended to use the developed impulse fine-dispersed irrigation system \"Ustimor\". The principle of operation of the installation is based on the pulsed displacement of water from the water-air tank by the combustion products of the fuel-air mixture under high pressure (>5 MPa). Experimental and industrial tests of the installation were carried out at the tailings storage facility of PJSC \"Ingulets Mining and Processing Plant\". The range of the installation is on average 120-130 m. The area of the irrigated surface in one cycle of operation is from 500 m2 to 750 m2. Fine spraying was observed along the entire length of the jet flight. In one hour of operation, the installation can release from 5 to 30 tons of water into the atmosphere in the form of drizzle. The intensity of watering for one work cycle is on average 0.85 l/m2. The possibility of autonomous operation of the installation and its remote control through the SCADA system has been confirmed. The installation of pulse fine-dispersed irrigation is recommended for use as a means of spraying liquid by the method of fine-dispersed irrigation on open areas of surfaces where dust is intensively swept and suspended. It can be used for dust suppression and humidification at tailings storage facilities, warehouses of bulk materials, landfills, technological highways. The \"Ustimor\" installation can also be used for fine-dispersed irrigation of plantations, vineyards, gardens, etc. Irrigation of leaf cover and soil surface will lower their temperature by 7 - 10 °C in the sun and by 6 - 6.6 °C in the shade.","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"210 1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139289872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the article, the relevance of the topic, namely the determination of an effective way to increase the shelf life of food products, was revealed. The latest studies and publications devoted to the theoretical and practical aspects of dry food production technology were analyzed. The most important requirements for drying systems and the main methods of drying fruit raw materials were considered and the goals of the work were formulated. The design of a chamber convection dryer for testing in the laboratory of the Department of Heat and gas supply, ventilation, and thermal power engineering of the National University "Yuri Kondratyuk Poltava Polytechnic" was presented. The obtained results of banana drying, their analysis, and comparison with the selection of the optimal option for the drying mode were given. Conclusions from the performed work were presented.
{"title":"Thermal modernization and improvement of ingeneering systems of campus F of National University \"Yuri Kondratyuk Poltava Polytechnic\"","authors":"Dmitriy Guzyk, Oleksandra Cherednikova, Dmytro Dubchak, Bohdan Nesterenko, Alina Perederii, Oleksiy Simon","doi":"10.32347/2409-2606.2023.45.21-28","DOIUrl":"https://doi.org/10.32347/2409-2606.2023.45.21-28","url":null,"abstract":"In the article, the relevance of the topic, namely the determination of an effective way to increase the shelf life of food products, was revealed. The latest studies and publications devoted to the theoretical and practical aspects of dry food production technology were analyzed. The most important requirements for drying systems and the main methods of drying fruit raw materials were considered and the goals of the work were formulated. The design of a chamber convection dryer for testing in the laboratory of the Department of Heat and gas supply, ventilation, and thermal power engineering of the National University \"Yuri Kondratyuk Poltava Polytechnic\" was presented. The obtained results of banana drying, their analysis, and comparison with the selection of the optimal option for the drying mode were given. Conclusions from the performed work were presented.","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139289859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-12DOI: 10.32347/2409-2606.2022.41.50-54
S. Baranovska, V. Filonenko
Enterprises with energy-intensive production have combined heat and power plants (CHP) in their structure. During the implementation of energy saving measures, it is possible to achieve different ratios between the indicators of the efficiency of consumption of thermal and electrical energy by enterprises for production. With certain ratios between specific heat and electricity consumption in production, the enterprise is forced to buy a certain part of the electricity in the district power system (DPS) to prevent the discharge of steam exhausted by the turbine into the atmosphere or to deliver excess electricity of its own generation to the DPS. The problem cited in the article indicates that the choice is determined by the prices for fuel for CHP and the ratio between the prices for electricity purchased in the DPS and delivered to the DPS. Although electricity consumption in the production of sugar does not exceed 11% of the energy of the fuel, it is profitable to generate it in excess (turbine generators operate at maximum, close to the nominal mode) and deliver it to the distribution zone at a price higher than the cost. The proposed method for selecting operating modes for CHP turbine plants using the example of a sugar plant, which can also be used for the construction industry, as well as a method for determining energy costs for all operating modes of a sugar plant turbine plant. The influence of the cost of electricity in the distribution zone on the choice of the mode of operation of turbine plants of the CHP, which provide the minimum financial costs for the energy supply of the enterprise, has been established. A method for determining the standard size of a CHP turbine plant that satisfies the specific indicators of heat and electricity consumption of an enterprise is presented.
{"title":"Energy efficiency of operational regimes of combined heat and power plants of industrial enterprises","authors":"S. Baranovska, V. Filonenko","doi":"10.32347/2409-2606.2022.41.50-54","DOIUrl":"https://doi.org/10.32347/2409-2606.2022.41.50-54","url":null,"abstract":"Enterprises with energy-intensive production have combined heat and power plants (CHP) in their structure. During the implementation of energy saving measures, it is possible to achieve different ratios between the indicators of the efficiency of consumption of thermal and electrical energy by enterprises for production. With certain ratios between specific heat and electricity consumption in production, the enterprise is forced to buy a certain part of the electricity in the district power system (DPS) to prevent the discharge of steam exhausted by the turbine into the atmosphere or to deliver excess electricity of its own generation to the DPS. The problem cited in the article indicates that the choice is determined by the prices for fuel for CHP and the ratio between the prices for electricity purchased in the DPS and delivered to the DPS. Although electricity consumption in the production of sugar does not exceed 11% of the energy of the fuel, it is profitable to generate it in excess (turbine generators operate at maximum, close to the nominal mode) and deliver it to the distribution zone at a price higher than the cost. The proposed method for selecting operating modes for CHP turbine plants using the example of a sugar plant, which can also be used for the construction industry, as well as a method for determining energy costs for all operating modes of a sugar plant turbine plant. The influence of the cost of electricity in the distribution zone on the choice of the mode of operation of turbine plants of the CHP, which provide the minimum financial costs for the energy supply of the enterprise, has been established. A method for determining the standard size of a CHP turbine plant that satisfies the specific indicators of heat and electricity consumption of an enterprise is presented.","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79168670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-12DOI: 10.32347/2409-2606.2022.41.18-23
Iryna Venhryn, S. Shapoval, V. Zhelykh, K. Kozak, Bohdan Gulai
Taking into account the fact that the volume of traditional fuel energy is not significant and limited, it is important for the present and future generation to introduce new progressive ideas concerning alternative changes in the fuel energy complex in the prism of environmental education. The issues of energy efficiency of alternative fuels in Ukraine is more acute than in the world. The reasons for this are outdated technologies, the exhaustion of resources, the use of fixed assets for electricity and heat generation, which together with low fuel efficiency leads to significant emissions of harmful substances. The use of solar energy in Ukraine will make it less dependent on fluctuations in fuel prices. It is known that, solar installations are often characterized by complex structures or low utilization of the useful space, require complex electro mechanical systems and guidance mechanisms. Currently, there are a significant number of solar collectors, different design and technical and economic indicators. Environmental friendliness and economic benefits of these systems remain the main issue during installation. Taking into account the scientific and technological progress that reduces the cost of energy obtained with the help of solar collectors, the improvement of structures that generate thermal and electrical energy remains an urgent issue today. The paper offers design solutions for improving the translucent facades of buildings, which today play an extremely important role in architectural and structural terms. Such a solution based on the use of solar energy is a solar collector integrated into the light transparent facade of the building, which will save space for its self-installation and allow generating consumer energy by the structure of the building. Theoretical formulas for constructing and calculating the energy characteristics of a solar power supply system are elucidated for the proposed design of a hybrid thermal and photovoltaic solar collector.
{"title":"Heat supply of buildings with environmentally friendly sources using solar energy","authors":"Iryna Venhryn, S. Shapoval, V. Zhelykh, K. Kozak, Bohdan Gulai","doi":"10.32347/2409-2606.2022.41.18-23","DOIUrl":"https://doi.org/10.32347/2409-2606.2022.41.18-23","url":null,"abstract":"Taking into account the fact that the volume of traditional fuel energy is not significant and limited, it is important for the present and future generation to introduce new progressive ideas concerning alternative changes in the fuel energy complex in the prism of environmental education. The issues of energy efficiency of alternative fuels in Ukraine is more acute than in the world. The reasons for this are outdated technologies, the exhaustion of resources, the use of fixed assets for electricity and heat generation, which together with low fuel efficiency leads to significant emissions of harmful substances. The use of solar energy in Ukraine will make it less dependent on fluctuations in fuel prices. It is known that, solar installations are often characterized by complex structures or low utilization of the useful space, require complex electro mechanical systems and guidance mechanisms. Currently, there are a significant number of solar collectors, different design and technical and economic indicators. Environmental friendliness and economic benefits of these systems remain the main issue during installation. Taking into account the scientific and technological progress that reduces the cost of energy obtained with the help of solar collectors, the improvement of structures that generate thermal and electrical energy remains an urgent issue today. The paper offers design solutions for improving the translucent facades of buildings, which today play an extremely important role in architectural and structural terms. Such a solution based on the use of solar energy is a solar collector integrated into the light transparent facade of the building, which will save space for its self-installation and allow generating consumer energy by the structure of the building. Theoretical formulas for constructing and calculating the energy characteristics of a solar power supply system are elucidated for the proposed design of a hybrid thermal and photovoltaic solar collector.","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89919461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-12DOI: 10.32347/2409-2606.2022.41.32-38
D. Vakulenko, V. Mileikovskyi
Today buildings should be designed for energy efficiency class not less than C. This requires ventilation with heat recovery. On the market, there are different compact heat recovery ventilation units for decentralized ventilation. Regenerative ventilators represent a promising area of effective ventilation with exhaust air heat recovery. They operate cyclically for the inlet and outlet of air. These kinds of ventilators should work in a blocked pair(s) – one for input and one for output in each pair. If not, the effectiveness will decrease. A mathematical model of the ceramic heat regenerator in the regenerative ventilator “Twin Fresh” by Vents has been created to improve the efficiency of its operation. In previous works, on the basis of two different approaches, the operation of the heat regenerator was simulated. The first one uses M. Mikheev’s formula for the Nusselt number. The second one is computational fluid dynamic simulation by SolidWorks Flow Simulation. The efficiency coefficients obtained as a result of the simulation had a significant difference – up to 66.5 %. The aim of the work is to find alternative methods for adequately determining the efficiency of the ventilator. A mathematical simulation was performed using a different formula from “Novyi spravochnik khimika i tekhnologa. Protsessy i aparaty khimicheskikh tekhnologii”. This formula takes into account the Grashof number. Values obtained are significantly different from both previous ones – up to two times. There is no information in the literature about the experimental conditions for determining the Nusselt number, which was used in the simulation. Therefore, we can’t assume, what approach is closer to the conditions of the ceramic regenerator. There is a need to conduct experimental studies to determine the efficiency of the regenerative heat exchanger.
今天的建筑应设计为能效等级不低于c。这需要通风与热回收。在市场上，有不同的紧凑型热回收通风机组分散通风。蓄热式通风机是利用废气热回收进行有效通风的一个有前途的领域。它们循环运行，用于空气的吸入和排出。这些类型的通风机应该在一个阻塞对中工作-每个对中一个用于输入，一个用于输出。否则，效果会下降。为提高“双新鲜”通风口蓄热式通风机陶瓷蓄热器的运行效率，建立了其数学模型。在以往的工作中，基于两种不同的方法，对蓄热器的运行进行了模拟。第一个使用M. Mikheev的努塞尔数公式。二是利用SolidWorks Flow simulation进行计算流体动力学仿真。模拟得到的效率系数有显著的差异-高达66.5%。这项工作的目的是寻找替代方法，以充分确定呼吸机的效率。使用与“Novyi spravochnik khimika i tekhnologa”不同的公式进行数学模拟。protesessy i paraty khimicheskikh technologii”。这个公式考虑了格拉什夫数。得到的值与之前的值有很大的不同——最多相差两倍。在文献中没有关于确定模拟中使用的努塞尔数的实验条件的信息。因此，我们不能假设，哪种方法更接近陶瓷蓄热器的条件。有必要进行实验研究，以确定蓄热式换热器的效率。
{"title":"Simulation the effectiveness of heat recovery of the regenerative ventilator using different approaches","authors":"D. Vakulenko, V. Mileikovskyi","doi":"10.32347/2409-2606.2022.41.32-38","DOIUrl":"https://doi.org/10.32347/2409-2606.2022.41.32-38","url":null,"abstract":"Today buildings should be designed for energy efficiency class not less than C. This requires ventilation with heat recovery. On the market, there are different compact heat recovery ventilation units for decentralized ventilation. Regenerative ventilators represent a promising area of effective ventilation with exhaust air heat recovery. They operate cyclically for the inlet and outlet of air. These kinds of ventilators should work in a blocked pair(s) – one for input and one for output in each pair. If not, the effectiveness will decrease. A mathematical model of the ceramic heat regenerator in the regenerative ventilator “Twin Fresh” by Vents has been created to improve the efficiency of its operation. In previous works, on the basis of two different approaches, the operation of the heat regenerator was simulated. The first one uses M. Mikheev’s formula for the Nusselt number. The second one is computational fluid dynamic simulation by SolidWorks Flow Simulation. The efficiency coefficients obtained as a result of the simulation had a significant difference – up to 66.5 %. The aim of the work is to find alternative methods for adequately determining the efficiency of the ventilator. A mathematical simulation was performed using a different formula from “Novyi spravochnik khimika i tekhnologa. Protsessy i aparaty khimicheskikh tekhnologii”. This formula takes into account the Grashof number. Values obtained are significantly different from both previous ones – up to two times. There is no information in the literature about the experimental conditions for determining the Nusselt number, which was used in the simulation. Therefore, we can’t assume, what approach is closer to the conditions of the ceramic regenerator. There is a need to conduct experimental studies to determine the efficiency of the regenerative heat exchanger.","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74559990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-12DOI: 10.32347/2409-2606.2022.41.24-31
P. Glamazdin, P. Pasichnyk, О. Priymak
The main trend in the development of district heating systems in recent years is a decrease in the temperature of heat carrier, based on the desire to include renewable energy sources in such systems. Despite the ever-increasing demands on the thermal envelope of buildings, lowering the temperature entails the need to increase the area of heating appliances. In turn, this leads to an increase in material consumption of heating systems, increasing their hydraulic resistance and design problems. In order to avoid or at least reduce these negative consequences of the struggle to increase the environmental friendliness and energy efficiency of district heating systems, it is necessary to intensify the heat dissipation of heating appliances. The existing designs of sectional aluminium radiators, which are the most promising for improving their thermal performance, have reached a certain limit in the design, to overcome which it is necessary to change the technology of manufacturing the heat dissipating element of the section. The article shows the reasons for the emergence of such a limit for the existing design of devices, formulates requirements for advanced designs and shows the way to achieve higher thermal performance. The article presents the results of calculations that confirm the presence of the detected limit of thermal performance of existing structures of sectional aluminium radiators. Based on the analysis of existing designs and the identified limits of their further development, a new design of aluminium sectional heating device is proposed, which allows to bypass and overcome the limitations that are characteristic of existing ones. The results of calculations showing the possibilities of intensification of heat transfer of a sectional aluminium device are given. At the same heat output, the dimensions of the proposed radiator will be about thirty percent smaller than the size of existing appliances. The article presents the results of tests of prototypes of sectional radiators of the new design, manufactured using new technology. Devices consisting of seven sections of three sizes in height were investigated: 293 mm, 596 mm, 1097 mm. The results of the study confirmed previous theoretical developments. The tests were conducted in a laboratory certified according to European Union standards at the Institute of Heating and Sanitary Engineering in Radom (Poland).
{"title":"Possibilities of improving the design of sectional aluminium radiator","authors":"P. Glamazdin, P. Pasichnyk, О. Priymak","doi":"10.32347/2409-2606.2022.41.24-31","DOIUrl":"https://doi.org/10.32347/2409-2606.2022.41.24-31","url":null,"abstract":"The main trend in the development of district heating systems in recent years is a decrease in the temperature of heat carrier, based on the desire to include renewable energy sources in such systems. Despite the ever-increasing demands on the thermal envelope of buildings, lowering the temperature entails the need to increase the area of heating appliances. In turn, this leads to an increase in material consumption of heating systems, increasing their hydraulic resistance and design problems. In order to avoid or at least reduce these negative consequences of the struggle to increase the environmental friendliness and energy efficiency of district heating systems, it is necessary to intensify the heat dissipation of heating appliances. The existing designs of sectional aluminium radiators, which are the most promising for improving their thermal performance, have reached a certain limit in the design, to overcome which it is necessary to change the technology of manufacturing the heat dissipating element of the section. The article shows the reasons for the emergence of such a limit for the existing design of devices, formulates requirements for advanced designs and shows the way to achieve higher thermal performance. The article presents the results of calculations that confirm the presence of the detected limit of thermal performance of existing structures of sectional aluminium radiators. Based on the analysis of existing designs and the identified limits of their further development, a new design of aluminium sectional heating device is proposed, which allows to bypass and overcome the limitations that are characteristic of existing ones. The results of calculations showing the possibilities of intensification of heat transfer of a sectional aluminium device are given. At the same heat output, the dimensions of the proposed radiator will be about thirty percent smaller than the size of existing appliances. The article presents the results of tests of prototypes of sectional radiators of the new design, manufactured using new technology. Devices consisting of seven sections of three sizes in height were investigated: 293 mm, 596 mm, 1097 mm. The results of the study confirmed previous theoretical developments. The tests were conducted in a laboratory certified according to European Union standards at the Institute of Heating and Sanitary Engineering in Radom (Poland).","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91077545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-12DOI: 10.32347/2409-2606.2022.41.6-17
B. Basok, B. Davydenko, V. Novikov, S. Goncharuk, L. Kuzhel, O. Lysenko
Self-oscillations of pressure arising in the elements of power equipment with an internal heat supply can, in some cases, impair the operation of this equipment. At high amplitudes of self-oscillations, conditions for its damage can be created. Thermoacoustic self-oscillations are a consequence of flow instability. A well-known example of processes accompanied by the generation of thermoacoustic self-oscillations is vibration combustion, which is observed in rocket engines, in air heaters for blast furnaces, etc. In order to determine the characteristics of pressure self-oscillations, numerical studies of natural convection in a vertical channel with internal local heat release are carried out. Heat release from internal sources occurs in a limited section of the channel, which is closer to the inlet cross section of the channel. At the outlet cross section of the channel, there is a system of coaxial cylindrical bodies that constitute additional local hydraulic resistance to air flow. The characteristics of the air flow in the channel, which are accompanied by self-oscillations of velocity and pressure, are determined from the numerical solution of the system of equations of dynamics and heat transfer for a compressible medium, taking into account the dependence of the thermophysical properties of air on temperature. Based on the results of this solution, the velocity, pressure and temperature fields in the flow are determined. It is shown that changes in flow velocity and pressure with time have the character of oscillations with variable amplitude. Velocity oscillations at the channel outlet are in antiphase with velocity oscillations at the channel inlet. The amplitudes and frequencies of these oscillations are found. The measures were determined to reduce the amplitude of pressure fluctuations in the flow. Among them - the dispersal of sources of internal heat release and a decrease in local hydraulic resistance. These measures can be applied to reduce the negative impact of self-oscillations on power equipment.
{"title":"The emergence of pressure self-oscillations in the flow of heat carriers and the development of mechanisms for reducing the amplitude of these oscillations","authors":"B. Basok, B. Davydenko, V. Novikov, S. Goncharuk, L. Kuzhel, O. Lysenko","doi":"10.32347/2409-2606.2022.41.6-17","DOIUrl":"https://doi.org/10.32347/2409-2606.2022.41.6-17","url":null,"abstract":"Self-oscillations of pressure arising in the elements of power equipment with an internal heat supply can, in some cases, impair the operation of this equipment. At high amplitudes of self-oscillations, conditions for its damage can be created. Thermoacoustic self-oscillations are a consequence of flow instability. A well-known example of processes accompanied by the generation of thermoacoustic self-oscillations is vibration combustion, which is observed in rocket engines, in air heaters for blast furnaces, etc. In order to determine the characteristics of pressure self-oscillations, numerical studies of natural convection in a vertical channel with internal local heat release are carried out. Heat release from internal sources occurs in a limited section of the channel, which is closer to the inlet cross section of the channel. At the outlet cross section of the channel, there is a system of coaxial cylindrical bodies that constitute additional local hydraulic resistance to air flow. The characteristics of the air flow in the channel, which are accompanied by self-oscillations of velocity and pressure, are determined from the numerical solution of the system of equations of dynamics and heat transfer for a compressible medium, taking into account the dependence of the thermophysical properties of air on temperature. Based on the results of this solution, the velocity, pressure and temperature fields in the flow are determined. It is shown that changes in flow velocity and pressure with time have the character of oscillations with variable amplitude. Velocity oscillations at the channel outlet are in antiphase with velocity oscillations at the channel inlet. The amplitudes and frequencies of these oscillations are found. The measures were determined to reduce the amplitude of pressure fluctuations in the flow. Among them - the dispersal of sources of internal heat release and a decrease in local hydraulic resistance. These measures can be applied to reduce the negative impact of self-oscillations on power equipment.","PeriodicalId":23499,"journal":{"name":"Ventilation, Illumination and Heat Gas Supply","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91219078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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