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Search results: heat pump

Number of results: 24


Carrying out the repair work at petroleum refineries
Annotation:

The development of the oil refinery is directly related to the peculiarities of the socioeconomic environment, which is determined largely by the favorable conditions of activity of all branches of economy of the Republic of Kazakhstan, a stable regulatory processes of all normative -legal framework of implementation of market reforms and efficiency of making management and innovative solutions in the oil refining industry of the Republic of Kazakhstan. Currently, a lot of efforts are being made to scale modernization of all production processes, as well as modernization of equipment of the oil refining complex of the country

Year of release: 2020
Number of the journal: 1(77)

Preschoolchildren speech development through the theatrical activities
Annotation:

Theoretical aspects of preschool children speech development by means of theatricalization are highlighted in the article which is understood by the authors as purposeful pedagogical activity providing effective learning of mother tongue vocabulary. A number of games classifications are analyzed that make up the theatrical activity. Emphasizing that the theatrical activities can be organized in different areas of work with children of preschool age the authors reveal issues of these areas.

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The analysis of thermostability characteristics of refractory materials of aluminum electrolyzers
Annotation:

The article considers the methods of rationalizing the process of heating the refractory materials of aluminum electrolyzers up in relation to thermal stresses arising in the hearth lining. The functional goals of the refractory materials are listed. The operational characteristics of the refractory materials are presented. During thermal influence on a hearth lining, the physical effects called thermal expansion occur. The materials which save their properties under high temperature are known as refractory materials. The thermostability is described in more detail. The scientific test bench was used to investigate ultimate strength. The method of temperature and pressure measurement when conducting the experiments is cited. In order to choose the potlining it is necessary to know the peculiarities of refractory materials and actual industrial loadings as precisely as possible.

Author: A.A. Assainov
Year of release: 2015
Number of the journal: 2(58)

The analysis of influence of various parameters on heat conduction of a number of heat-insulating materials
Annotation:

The results of the analysis of influence of some main process factors on heat conduction of heat-insulating materials are given in this article. As major factors were considered: density, temperature, humidity. Researchers are conducted on the basis of the theory of planning of experiment. The got dependences of heat conductivity on a closeness and temperature of material show approximately equal influence of these factors on the exit of experiment

Year of release: 2015
Number of the journal: 2(58)

Methods of energy saving increase under during agglomerate production at Aksu Ferroalloy Plant Branch of “Kazchrome” JSC
Annotation:

In this article issues of efficient use of ferroalloys production waste to save costs are considered; energy efficiency of agglomerate production is calculated; sintering heat balance data are presented by a case study of Aksu Ferrolloy Plant. According to the annual economic benefits calculation the folowing results are obtained: due to аglogases recirculation, fuel saving is 1334.5 t.o.e.; due to reheating it is 1491 t.o.e.; due to installation of thyristor converters to the unit the annual energy saving is 1714000 kWh. Thus, it is identified that besides energy-efficiency measures during recycling of solid and gaseous wastes, the use of agglomerate increases IPF electric furnaces performance as well, decreases specific energy and reducing agent consumption which means the prime cost of finished products will be reduced.

Year of release: 2015
Number of the journal: 2(58)

Waste-heat recovery of turbine condenser water Method
Annotation:

One of the directions of energy saving is the application of heat pumps by means of which it is possible to use low-potential, usually waste heat. The question of the possibility of using heat pumps in thermal power plants is considered in the present article. Also a diagram of possible use in thermal power stations of low-grade waste heat with heat pump installation is presented in the article.

Author: А.P. Plevako
Year of release: 2015
Number of the journal: 2(58)

Integral transformations method in soil freezing problems
Annotation:

The method of integral transformations is used to study the process of bodies heating and cooling. As a result of theoretical calculations the regime of soil freezing depending on the ambient temperature was established. Laplace transformation is practically used to determing patterns temperature of constructed concrete dams, building grounds

Year of release: 2015
Number of the journal: 2(58)

The efficiency of the cavitation technology for autonomous heating systems
Annotation:

This article discusses some of the practical application of cavitation technologies in autonomous heating systems, attached elementary economic calculation. The modern achievements and cavitation vortex heat generators, principle of operation and types of such equipment. Marked positive and negative aspects of installation and operation of heat generators. A comparative analysis of the economic calculation of seasonal operating costs of the vortex heater as auxiliary heating systems and district heating tariffs for Pavlodar.

Author: V.M. Afanasev
Year of release: 2016
Number of the journal: 1(61)

Body heating automatic control system №1 Innovative University of Eurasia
Annotation:

The paper presents the thermal design of the building heating system of a four educational building № 1 Eurasian innovative university.Data are presented for the period from 1 December to 28 February for three seasons: 2013–2014, 2014–2015, 2015–2016 years. On the basis of the actual thermal design graphics and design of heat were built in the period from 1.12. at 28.02 for three seasons (2013-2014,2014-2015, 2015-2016 years). In these graphs clearly visible difference between the two values. According to calculation, the average difference was 13.02 % of the actual heat consumption.

Author: N.D. Khomarov
Year of release: 2016
Number of the journal: 1(61)

The role of healthy lifestyle in strengthening pupils` health – the basics of human life-sustaining activity
Annotation:

This article mainly deals with the role of healthy lifestyle in strengthening pupils` health. The relevance of the issue of healthy lifestyle modeling arises out of the fact that heath is one of the most significant life values of a person and a guarantee of his or her welfare longevity. Currently, due to the low life expectancy of people, it is crucial to foster the meaning of health as the main value in one`s life and importance and necessity of health preservation from the early childhood. Life preservation requires dedicated and persistent efforts from every person. Herewith, it is necessary to understand one fact: life preservation is a personal prerogative. If one is to always be healthy one must remember that it requires persistent, dedicated and considerable efforts. Therefore, it is crucial to have a long course of personal conduct that designates the general culture of our labour and rest management, rational combination of physical and mental workload, sensible nutrition, active leisure and good quality sleep, and, moreover, skills of safe conduct in different dangerous emergencies. All of it composes the system of healthy lifestyle.

Year of release: 2016
Number of the journal: 3(63)

The possibility of applying carbon fuel material in agro-industrial complex
Annotation:

The variants of the use of carbon as a heat-generating material in the agro-industrial complex are highlighted. This will significantly save energy, improve the environment, reduce the cost of operation, repair and maintenance of buildings and structures.

Year of release: 2018
Number of the journal: 1(69)

Innovative technologies for enrichment of flour from wheat grain
Annotation:

The technogenic impact on the ecological environment led to a decrease in the amount of natural food consumed and a change in its qualitative composition. The article discusses the innovative direction – enrichment of food with micronutrients. New types of bread with functional properties for mass nutrition are developed.

Year of release: 2018
Number of the journal: 1(69)

Lime yield and roasting time using ferroalloy gas
Annotation:

Evaluation of the output of lime is made for three options for the use of Ferroalloy gas: when you use the physical heat of the gas; when using the chemical energy of the gas and the location of the reactor after scrubbing; when sharing of sensible heat and chemical energy of the gas. As a result of the calculation of the expected yield of lime, it was found that the use of Ferroalloy gas for the production of lime can fully provide or at least compensate for the deficit of lime in the production of steel. The technology of calcination of limestone with Ferroalloy gas is presented in the form of a cycle synchronized with the smelting of steel, including, in accordance with the gas outlet from the layer and their alternation with pauses of inter-blowing periods. The preliminary technological characteristics of firing obtained as a result of theoretical analysis are used for further experimental and theoretical studies.

Year of release: 2018
Number of the journal: 2(70)

The main directions of social and economic development of Pavlodar region
Annotation:

This article describes the main directions of socio-economic development of Pavlodar region, provides characteristics and dynamics of the main areas and sectors of the region, including the state of industrial production, agriculture, development of small and medium-sized businesses, the labor market, trade, electricity, heat and water supply, construction. The region is characterized by a progressive and diversified economic structure. In the structure of industry of Pavlodar region the largest share is occupied by the manufacturing industry. The priority direction of development of the regional economy in the context of ensuring its socio-economic development is the development of small and medium-sized businesses

Year of release: 2019
Number of the journal: 1(73)

Possibility of using of thermal pumps at thermal power plants and heat boiler stations
Annotation:

Different diagrams of thermal pumps operation at thermal power plants are considered in the article. Thus, installation diagrams are considered for thermal pump based on the use of low -grade heat of turbo-unit lubricating system oil and blow-down water of a steam generator.

Author: А.P. Plevako
Year of release: 2019
Number of the journal: 2(74)

Influence of ultrasonic treatment on the efficiency of biogas production
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This paper presents the results of the influence of ultrasonic treatment in the cofermentation of the cattle manure mixture (cattle) with the leaven from the rumen of ruminants on the process of biogas production. Anaerobic digestion was carried out in matinence periodic operation at the mesophilic temperature of 38 C ̊. As a substrate, a mixture with a content of 70 % cattle manure and 10 % leaven from rumen of ruminants was used. Treatment with ultrasound of the mixture was carried out at an intensity of 10 W/cm2 and an amount of input energy of 9350 kJ/kg of dry matter (DM), which completely eliminated the processes of stratification and sedimentation. Decomposition of organic matter (OM) in the periodic regime with the enzyme and ultrasound treatment occurred within 8 days, the usual substrate during this time OM decomposed 3.0 times less (only 14 %). The process of fermentation of methane in continuous and periodic modes treated with ultrasound, as at other temperatures, was stable, as can be judged by the values of volatile fatty acids (VFA) Volatile fatty acids (VFAs), alkalinity, pH, and biogas. The energetical efficiency of methane fermentation is estimated by comparing the volume of fuel (biogas) and heat consumption for technological needs. As shown by the comparison of efficiency of different regime, the largest amount of commercial energy in the form of biogas was obtained in the mode of joint fermentation of a mixture of cattle manure (cattle) with a ferment from the rumen of ruminants treated with ultrasound – 3 times more than without treatment (space).

Year of release: 2020
Number of the journal: 2(78)

The study of nutritional values and organoleptic properties of poly-grain extruded mixture
Annotation:

Among many environmental conditions that affect a person, the most important factor is nutrition. Today, there is no doubt that there is a direct link between nutrition, health and disease. Proper nutrition ensures normal growth and development of a person, contributes to the prevention of diseases, has a positive impact on life expectancy and creates conditions for adaptation to the environment. A very actual topic for public catering in the Republic of Kazakhstan, namely for fast food companies, is the development of new recipes and culinary products from relatively inexpensive vegetable raw materials, as well as qualitatively new food products with a purposefully changed chemical composition. One of the main ways of solving problems of expanding the production of products for quick service, as well as products for dietary and therapeutic and preventive nutrition is the use of sprouted grains and beans. In this article, poly-grain mixtures of sprouted wheat and extruded soy beans in different ratios are studied and considered. Poly-grain mixtures developed by us are balanced in nutrients, vitamins and amino acids. The research was carried out on the basis of the accredited testing laboratory of RUBICOM enterprise LLP and the scientific laboratory of the Innovative Eurasian University. The purpose of this work is to study a promising method for increasing the nutritional value of grain mixtures by extruding them at different temperature conditions. To achieve this goal, the following tasks were planned: – to study the grain of soy beans and sprouted wheat on the organolepti c characteristics and chemical composition of the poly-grain mixture; – examine the chemical composition of the poly-grain mixture before extrusion; – choose the optimal mode of the extrusion process; – study and analyze the chemical composition of poly-grain extruded mixture; It should be noted that we have developed for the first time the optimal technological mode of extrusion of poly-grain mixture from sprouted wheat and soy beans, and the physical and chemical composition of the poly-grain mixture was studied. The results of the research presented in this paper are the basis for the development of recipes and technologies for fast food products. The reliability and validity of scientific statements is confirmed by the choice of modern methods of chemical composition analysis.

Year of release: 2020
Number of the journal: 2(78)

Grain market of the Republic of Kazakhstan: assessment of the state, identification of problems and development trends
Annotation:

The article reveals the dynamics of grain production in the Republic of Kazakhstan, grain exports by countries. The author analyzes the grain market (sown area, yield, gross harvest). Kazakhstan has a significant potential for grain exports. Grain exports are important for the country's economy. The country is one of the six largest grain exporters in the world. This is due to the high milling properties of Kazakh grain, the quality indicators of Kazakh flour are highly valued in many countries of the world, which allows Kazakh wheat to be competitive in the world market and provide markets in various countries of the world. The main export destinations are Uzbekistan, Afghanistan and Tajikistan. The article analyzes the main trends in the development of the grain market and gives an assessment of the state.

Author: O.I. Zhaltyrova
Year of release: 2019
Number of the journal: 2(74)

Development and research of means and methods for improving the efficiency of heat stations in the Republic of Kazakhstan
Annotation:

The main problem: This article is devoted to the key problems of the fuel and energy complex of the Republic of Kazakhstan: 1) lack of production capacity to meet the growing demand for energy and fuel from the economy and the population. Increased demand for electricity and heat, which will require the commissioning of new generating capacities.There is already a shortage in the fuel markets. Modernization and bringing the existing oil refineries (hereinafter referred to as refineries) to full capacity will not allow providing the domestic market until 2030; 2) the export orientation of raw materials, the dependence of the economy on the export of energy resources. In order to attract technology and investment in the oil and gas and nuclear industries, agreements on the extraction of energy resources were concluded with international export companies. In the medium term, Kazakhstan may face a shortage of oil for domestic refineries, if measures are not taken to stimulate its refining within the country. The uranium mined is fully exported; 3) high energy intensity of the economy, low level of energy efficiency. There is a high potential for increasing the efficiency of energy use both in the electric power industry and fuel production, and at the level of final consumption – in industry and housing and communal services; 4) decrease in the replenishment and quality of the resource base in the oil and gas, coal and nuclear industries; 5) low environmental friendliness of technologies used in the fuel and energy complex. Purpose: The purpose of the article is to reveal the problem in the field of ensuring the fulfillment of international obligations between different countries and their own energy sufficiency by gradually changing the structure of energy production. Methods: Studying the experience of increasing the efficiency of the use of energy resources and energy saving as a priority of the state policy of the country. Analysis of production capacity with a constantly forecasted shortage of primary energy resources and insufficient growth of capacity for the production of electricity and heat. Consideration of the possibility of compensating for the shortage by saving energy resources, increasing tariffs for energy carriers, as a stimulating factor for their effective use. Results and their significance: The results of this article will reflect the problems of energy, as the most important driving force of global economic progress. The well-being of the people depends on the state of the country's energy sector, therefore there is an urgent need to solve the emerging problems. The global energy problem is, first of all, the issue of stable and efficient supply of fuel and energy to mankind. Today, the energy sector of Kazakhstan is focused on fuel resources, since the country is provided with hydrocarbons and other energy resources. About 72 % of electricity in Kazakhstan is generated from coal, 12,3 % from hydro resources, 10,6 % from gas and 4,9 % from oil. Thus, the four main types of power plants generate 99,8 % of electricity, while alternative sources account for less than 0,2 %.

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Ingularly perturbed equations in critical cases
Annotation:

Singularly perturbed partial differential equations with small parameters with higher derivatives deserve special attention, which often arise in a variety of applied problems and are used in describing mathematical models of diffusion processes, absorption taking into account small diffusion, filtration of liquids in porous media, chemical kinetics, chromatography, heat and mass transfer, hydrodynamics and many other fields. It is necessary to consider the creation of an asymptotic classification of solutions of singularly perturbed equations using a well-known approach to solving the boundary value problem. In this case, the singular problem is understood as the problem of constructing the asymptotics of the solution of the Cauchy problem for a system of ordinary differential equations with a small parameter with a large derivative. The asymptotics of the solution in all cases is based on the last time interval or the construction of a boundary value problem for a system with a weak clot in an asymptotically large time interval. Purpose - to construct and substantiate the asymptotics of solving a singular initial problem for a system of two nonlinear ordinary differential equations with a small parameter; To date, a number of methods have been developed for constructing asymptotic expansions of solutions to various problems. This is the method of boundary functions developed in the works of A.B. Vasilyeva, M.I. Vishik, L.A. Lusternik, V.F. Butuzov; the regularization method of S. A. Lomov, methods of averaging, VKB, splicing of asymptotic decompositions of A.M. Ilyin and others. All the above methods allow us to obtain asymptotic expansions of solutions for wide classes of equations. At the same time, such singularly perturbed problems often arise, to which ready-made methods are not applicable or do not allow to obtain an effective result. Therefore, the development of methods for solving equations remains a very urgent problem. As a result of the study, an algorithm for constructing an asymptotic classification of the initial solution of the problem with a singular perturbation is given, and approaches to estimating the residual term are also shown.

Year of release: 2021
Number of the journal: 4(84)

Simulation of the working cycle of a diesel engine with a system of periodic shutdown of the cylinders
Annotation:

Combustion engines operate over a wide range of power and speed. To the greatest extent, this applies to automotive and tractor engines and diesel engines operating at fractional and idle loads for a significant part of the operating time. When designing engines, the choice of their main design and layout parameters is carried out in a comprehensive manner, taking into account the provision of the required power and efficiency in the modes of maximum torque and rated power. However, ensuring the economical operation of modern highly accelerated diesel engines at low loads and idling causes a whole range of problems related mainly to the organization of effective mixture formation and fuel burnout, as well as to ensuring stable fuel supply. Thus, the cycle dose of injected fuel in idle mode is 8–12 times less than the cycle dose in nominal mode, which determines increased requirements for fuel equipment and difficulties in ensuring high-quality mixture formation. At the same time, diesel engines operate in idle mode up to 50 % of the total operating time, consuming up to 15–20% of the fuel. For truck engines, the relative idle time is approximately 20–25 %. Thus, the development of measures to improve the efficiency of diesel engines at idle is relevant. The purpose is to perform a numerical analysis of the effect of switching off cycles in diesel engines for autotractor and diesel locomotive purposes on the working processes in the cylinder and the indicator parameters of the cycle in idle modes. When writing the article, traditional methods (comparison, description, and measurement), generallogical methods and research techniques (analysis, generalization, etc.) were used. A numerical analysis of the operating cycle of a diesel engine equipped with a cycle shutdown system was performed. The relationship between changes in fuel injection characteristics when cycles are turned off with indicator indicators of the engine operating cycle in idle load modes is disclosed. It has been established that the expediency of switching off cycles in a specific engine operation mode is determined primarily by the features of the injection, carburetion and fuel burnout processes.

Year of release: 2022
Number of the journal: 1(85)

The use of a heat pump at an industrial enterprise in the region
Annotation:

Main problem: The use of waste heat is most often solved by installing heat exchangers, but this is not effective when the temperature of this heat does not exceed 10-15 0 C, in which case this heat can be used using a heat pump. Where can I get this heat? Almost any enterprise needs cooling of any equipment elements or substances – working fluids; the heat received from them can be sent to a heat pump and used here at the enterprise. Purpose: Consideration of the possibility of using the heat of cooling water from the pump CNS 60-165 and the proposal of a new scheme with the installation of a heat pump that uses this heat. Methods: This is achieved due to the fact that it is proposed not to discard the heat, but after its use in the heat pump evaporator, transfer it to the heated medium - water, which is then sent to the shower cabins of the enterprise. Since the showers are located in the same room, the cost of transporting heat and losses will be minimal. Methods: In the course of the research, the possibility of using the waste heat of an industrial enterprise for using it here at the enterprise for the purposes of hot water supply was considered. For these purposes, it is proposed to install a heat pump, thanks to which the thermal potential increases, which makes it possible to fully use the received heat. Results and their significance: As the experience of foreign countries has shown, heat pumps can be widely used in many industrial enterprises, and in conditions of increased competitiveness, in order to reduce energy costs and the cost of manufactured products, install heat pumps to utilize excess heat, for example, process water, which is available in many production allows you to have a significant economic effect.

Year of release: 2022
Number of the journal: 2(86)

Energy savings through the use of refractory masonry with a lower thermal conductivity
Annotation:

Main problem: recently, much attention has been paid to energy saving in production, especially when it comes to industrial units that burn fuel. There are several ways to maximize the use of the heat released during the combustion process, for example, to reduce the temperature of the flue gases at the outlet of the unit, by maximizing its use, both in the technological process itself and by installing additional heat-receiving units, for example, air heaters or other heaters. Another way to save money is to reduce heat losses through the lining of these high-temperature units. Metallurgical units that consume a large amount of energy and fuel require an analysis of their consumption, and ways to save their consumption based on the results of the analysis. Purpose: this article considers the possibility of replacing the existing inner insulation layer of the second and third sections of a high-temperature unit - a metallurgical furnace, with a new one with better technical and economic indicators. Methods: the possibility of replacing the existing inner insulation layer of the second and third sections of the high-temperature unit with a new one, with the best technical and economic indicators, was considered. The calculation of heat losses by thermal conductivity through the side surfaces and the roof with new insulation was performed, and the economic efficiency of the proposed solution was proved. Results and their significance: replacing the existing inner layer of insulation - refractory concrete PHLOCAST M30 (thermal conductivity coefficient from 1,4 to 1,45) with the proposed CERALIT GUN HK 70070 (thermal conductivity coefficient from 1,03 to 1,12) will reduce heat loss to the environment, and thus to reduce fuel consumption for the furnace.

Author: А.P. Plevako
Year of release: 2022
Number of the journal: 4(88)