Технические науки. Рубрика в журнале - Бюллетень науки и практики
10 t/d solar hot water project of building
Статья научная
With the development and growth of renewable energy application technology, the technology of using solar energy to supply domestic hot water is becoming increasingly mature. Centralized solar hot water systems play an important role in alleviating energy problems, and scholars from all walks of life are studying how to design solar building hot water projects. The solar hot water system uses a solar collector to collect the heat of the sun, and the collected heat is transmitted to a water storage tank for insulation through a circulating water pump. It is matched with appropriate energy sources such as electricity, gas, and fuel to heat the water in the tank and become a relatively stable quantitative energy source. Compared to household independent systems, centralized solar hot water systems have gradually become the mainstream form of solar hot water systems due to their high degree of integration, good integration with buildings, easy operation and maintenance, mutual balance of water usage among users, and easy implementation of instant heating. This article designs a 10 t/d building solar hot water project.
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Acoustic performance analysis of diesel engine silencer
Статья научная
The finite element model of diesel engine muffler is established, the noise reduction function of the muffler is studied and tested, the distribution cloud diagram of sound pressure level inside the muffler is calculated, the sound fields at various frequencies are plotted. The change of sound pressure level inside the muffler is tested. After processing, the line spectrum and octave band results of the transmission loss of the muffler are obtained. The acoustic performance of the muffler can be quantitatively determined by synthesizing the results of the sound field distribution and the transmission loss inside the muffler.
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Analysis of methods limiting gas breakthroughs into production wells at the Fedorovskoye field
Статья научная
The article explores the reasons causing gas breakthrough from the gas cap into the producing wells and oil penetration into the gas-saturated part of the formation at the Fedorovskoe Field. It appears that gas breakthrough to the perforated intervals of producing wells are mainly caused by the geological structure of AS4-8 formations (absence of robust shale break/screen) and relatively small distances from the upper filter holes to the gas- and gas-and-oil-saturated portion of the formation. Two operation modes applicable for this field are described: for the wells intersecting the formation with horizontal shaft under impermeable shale break between gas-and-oil-saturated layers (cases of gas breakthrough are excluded) and for horizontal and vertical wells in the contact zones of gas-and-oil reservoirs or areas with thin split shale breaks (there is continuous gas breakthrough). The article describes engineering solutions ensuring insulation of gas breakthrough into wells...
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Статья научная
The article reviews the issue of waterflooding of gas and gas-condensate wells in the East-Tarkosalinskoe Field. The article lists currently applied methods to prevent and elimination the troubles in question. Recommendations are given regarding the application of the new technologies and technical means.
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Статья научная
The paper presents problems existing in passenger traffic by urban passenger transport, as well as the analysis of factors hindering the development of bus routes. There have been studied both quantitative and qualitative indicators of a deterioration in the quality of passenger service by urban buses in the city of Kutaisi. For a comprehensive study of the issue using the time-table method of field observations, an experimental study of the passenger flow was carried out. Based on the system analysis, an assessment was made of the indicators of redistribution of passenger flows by bus and minibus routes: the number of motive power on the routes, in accordance with the percentage of coincidence of the parameters of traffic regimes with the transport schemes. A list of measures has been drawn up, the integrated implementation of which will facilitate the development of a safe and convenient city-class bus route system.
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Application and exploration of aesthetics in ship
Статья научная
Ship aesthetics is a new professional discipline that studies the law of ship aesthetics from the perspective of scientific ship aesthetics and the comprehensive application of basic theories such as aesthetics, shipbuilding and architecture. From the vertical level, it has its own concept, theory and application system; From the perspective of horizontal professional scope, it is an edge discipline derived from the organic combination of shipbuilding and architecture. This paper mainly takes the connotation of design aesthetics as the starting point, in view of the deficiencies and difficulties existing in the current ship design, combined with the characteristics and connotation of design aesthetics, and uses the expression techniques of design aesthetics to show the practical application in ship design, so as to continuously innovate and make progress in ship design and create a more scientific, green, modern and comfortable marine living environment.
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Application on intelligent technology of electrical engineering and automation
Статья научная
In the electrical industry, the complexity and construction scale of electrical engineering are increasing, the traditional technology has been difficult to efficiently adapt to the development needs of the new era industry, deepening the popularization of the application of intelligent technology in electrical engineering and automation, is an important development direction of the electrical industry. This paper describes the basic connotation of electrical engineering and automation and intelligent technology, analyzes the electrical engineering and automation intelligent technology application in improving the level of system control, improve data processing accuracy and optimize the significance of system design, studied the electrical engineering and automation system in fault response processing, automation control, system design, the specific application of real-time monitoring.
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Assessment of the optimal quality level of engineering products in Azerbaijan
Статья научная
Some aspects of determining of dynamics of the optimal technological level of quality level engineering products are considered. It is established that the optimal quality level is constantly changing due to the systematic increasing requirements of consumers and continuous improvement processes. The dynamics of the optimal technological level of production quality and nature of the change of various kinds of quality levels is defined. It is specified that the optimum quality level expresses the degree of compliance of product to the specific needs. It is approved that improvement of the quality is reasonable only at the optimum quality level of the product to be achieved under optimum performance.
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Automatic processing of text in natural language
Статья научная
In this article, questions of artificial intelligence, in particular, automatic processing in natural language texts are considered. As well as types of wordform analysis are considered and an algorithm for finding the initial form of the word is proposed.
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Calculation method of fastening the upper slope of the land bund for erosion and strength
Статья научная
To protect the slopes of the ground dam from the devastating effects of wind waves, ice, water flow, precipitation and other factors, a number of engineering measures are provided. Based on this, an engineering decision is taken on the choice of materials for fastening structures, as well as methods for calculating their stability. When calculating the stability of the upper slope, two cases of a combination of loads and impacts are mainly considered. One of them is the reduction of the water level in the reservoir with maximum speed, and the other is the case when the water level in the reservoir is at the lowest operational level. The article investigates the processes of sliding of natural slopes of the upstream dam. Taking into account the combined action of the forces of filtering, weighing and vapor pressure, as well as the force of hydrostatic pressure to the level of dead volume. The equation for the stability coefficient of a circular-cylindrical slip of a uniform natural slope of the upstream dam has been obtained.
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Cavitation generator development process at Russia and abroad
Статья научная
The energy situation in the world indication a rapid increase in the consumption of natural resources. The only way out of this situation is the development of alternative environmentally friendly technologies. The research and utilization of cavitation heat generators will help ease the energy crisis and reduce exhaust emissions from fuel combustion. Therefore, it is a potential research topic.
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Статья научная
In the research and test of diesel engine, because the performance test of multi cylinder engine with different configuration needs to be replaced, and there is a certain risk in the first test, while the single cylinder engine is more suitable for the research and test of different configurations because of its simple structure and convenient replacement of components. Therefore, by comparing the differences of combustion state between single cylinder engine and multi cylinder engine with the same configuration, the change law of performance characteristics of single cylinder engine and multi cylinder engine under different working conditions is confirmed. By analyzing the difference of emission performance of single cylinder engine with different configuration, the emission performance of multi cylinder engine under different configuration is predicted. The research in this paper has important significance for further research and test of diesel engine.
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Construction and analysis of LNG cold energy utilization system
Статья научная
The theme of this research is the intermediate fluid vaporizer (IFV) gasification system for an offshore liquefied natural gas floating storage regasification unit (LNG-FSRU). Based on reducing the loss of heat exchange and improve the cold energy utilization, an LNG cold energy utilization system combined with Rankine cycle power generation and desalination is proposed. On this basis, six different schemes of working medium combination are simulated and analyzed, and the optimal scheme of working medium combination is found. The results show that the net output power of the system is 5591 kw, and the system exergy efficiency is 30.38%. The annual economic benefit is CNY 39.4 million.
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Current situation and development trend of urban centralized heating
Статья научная
In the context of sustainable development, countries around the world are increasingly paying attention to environmental issues. In this context, the high energy consumption and high pollution of urban heating systems have become urgent issues that need to be addressed. Promoting urban centralized heating is an inevitable choice to effectively solve these problems. The heating system is an important component of urban development, and central heating plays a crucial role in energy utilization. In order to meet the requirements of sustainable development, it is necessary to actively improve the central heating system and solve the problems of low resource utilization and high energy consumption in traditional decentralized heating methods. This can reduce air pollution and improve the overall quality of the urban environment. A comprehensive analysis of the relevant content of urban central heating systems, including understanding the existing problems and development trends, helps to formulate reasonable measures to promote the development of central heating. Promoting the development of central heating systems is an important component of urban sustainable development. By improving energy utilization efficiency, reducing dependence on traditional fossil fuels and using advanced technologies, central heating systems help to achieve the Sustainable Development Goals and improve the quality of life of urban residents. A comprehensive analysis of the current situation and development trends of urban central heating can help formulate reasonable measures to promote the development of central heating, achieve a more sustainable future, and create a sustainable urban environment.
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Current status and development of contemporary high temperature heat pump technology
Статья научная
With the continuous deepening of the concept of energy saving and emission reduction, heat pumps have been widely applied to life. With the improvement of heat quality, the corresponding condensation temperature of heat pump devices is required to be high. Therefore, high temperature heat pumps have become a hot topic, looking for a high-temperature heat pump working fluid is an effective way to develop a high-temperature heat pump device. Exploring a new heat pump cycle mechanism is also an effective way to generate a high-temperature heat pump device. This paper combs the research status of high temperature heat pump in the field at home and abroad and analyzes the existing high temperature heat pump working medium and high temperature heat pump circulation mechanism, mainly expounds the principle of the existing high temperature heat pump technology.
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Design and analysis of antireflection layer on the surface of crystalline silicon solar cell
Статья научная
With the positive development of photovoltaic technology, improving efficiency and reducing cost has become a global problem facing the solar industry. The development of solar cell anti-reflection film can significantly reduce the reflection of sunlight on the surface of the battery, increase the flux of light entering the battery, and create more photo-generated carriers, which is the most economical and effective way to improve the efficiency of the battery. More photo-generated carriers are produced, which is the most economical and effective way to improve the efficiency of batteries. Therefore, it’s of great value to explore a performance-matched antireflective film material for solar cells and its preparation process. The plasma enhanced chemical vapor deposition of silicon nitride antireflective coatings has been widely used in photovoltaic industry. The aim is to form an antireflection film on the surface of crystalline silicon solar cells and achieve good passivation effect. The thickness and refractive index of the antireflective film have an important influence on the performance of the battery. It is of great significance to explore the optimum technological conditions for preparing the optimum thin films. Considering the optical properties, stability, preparation process and production cost of antireflective film materials, the influence of antireflective film on the output characteristics of solar cells was studied by using PC1D simulation software.
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Design and analysis of heat pipe heat exchanger efficiency
Статья научная
The heat pipe has a high thermal conductivity, and its basic working principle is to transfer heat through evaporation and condensation through the working medium inside the pipe. Heat pipe has good thermal conductivity, isotherm and other characteristics, and the heat transfer area at both ends can be changed at will, control the temperature and other advantages. Therefore, the heat pipe heat exchanger has the advantages of high heat transfer efficiency, compact structure, small fluid resistance loss, and beneficial to control dew point corrosion. At present, it has been widely used in metallurgy, chemical industry, oil refining, boiler, ceramics, transportation, light textile, machinery and other industries, as energy saving equipment for waste heat recovery and heat energy utilization in the process and has achieved remarkable economic benefits. The design of the heat pipe heat exchanger on the development of the current situation, development trend, application, design principle and design process of a simple description, while focusing on the discussion of the heat pipe heat exchanger design process. The main content of the heat exchanger thermodynamic calculation, structural design and material selection. The model of heat pipe heat exchanger is established according to the actual situation and the calculated data.
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Design of PFC converter based on interleave boost
Статья научная
Based on the principle of stagger boost PFC, this paper expounds the application value of stagger PFC theory by developing a scientific and feasible scheme and using Matlab simulation. According to the subject requirements, the use of UCC28070 to achieve PFC control function. And learn IC functions. Based on the theory of interlaced PFC, the most suitable electronic device is selected to adjust each part of the circuit. Finally, Solidworks and Protel software were used to draw the radiator and PCB boards, then the prototype was made and debugged, and the final result was obtained.
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Статья научная
The subject of the research is designing a regenerative heat exchanger to heat hot water. Qualitative and quantitative analysis of relevant physical parameters to optimize heat exchanger models. The purpose of this study is to simulate realizing the goal of heating hot water with 25 kW and optimize the model to optimize the heat exchange efficiency in practical work. As a result of the research, Amplitude-frequency response of the circuit increases linearly as speed of rotation. When the speed is constant, the less of water mass is, the value of Amplitude great. The phase frequency response of the circuit increases overall as the speed increases. The greater the mass, the greater, and the rate of increase gradually decreases. we know that increasing the water volume can improve the heat transfer efficiency, but when the water volume (G) increases to 1.6, the rate of increasing the heat transfer efficiency begins to decline, so this should be taken into account in the design process. With the heating time increases, the heat transfer efficiency will also improve. It should be noted that when the heating time increases, the rate of increase of heat transfer efficiency decreases and specific heat capacity (KF) decreases.
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Design of a liquid cooler for a 100 kW semiconductor power converter
Статья научная
He focus of this research in this paper is to design a 100 kW power liquid cooler, semiconductor converter liquid cooler, thus using pulsed thermal medium circulation to increase the capacity of the cooling system on the surface of the power semiconductor device. Based on comparing the parameters of conventional and pulsed coolant circulation mode, the liquid cooling system of power semiconductor converter is studied by physical method. In laboratory testing, experiments are planned according to the order and frequency of changing device operating modes. Finally, the experimental research results are processed, and the relationship between the discharge heat power and the temperature drop and the coolant flow is established by using the mathematical statistics method. Result: Depending on the exhaust heat power and the coolant flow in the range of 3-1.5 L/min, the pulsating heat transfer enhancement in the liquid cooling system of the power semiconductor converter can increase the thermal capacity and the current load of the power semiconductor converter by a factor of almost 2.5 times, respectively. At the same time, the circulation of the coolant in the inner circuit is carried out by a hydraulic powered film pump.
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