Municipal economy of cities最新文献

{"title":"INVESTIGATION OF INFLUENCE OF FACTORS ON FIRE RESISTANCE OF PARTITIONS MADE OF SANDWICH PANELS","authors":"Y. Danchenko, Y. Kachkar, N. Rashkevich","doi":"10.33042/2522-1809-2023-1-175-145-150","DOIUrl":"https://doi.org/10.33042/2522-1809-2023-1-175-145-150","url":null,"abstract":"The authors describe the results of studies of thermal processes in partitions made of sandwich panels under one-sided influence of fire.\u0000Analysis of the thermal state of multilayer partitions with mineral wool plates and development of recommendations for the design of buildings from such structures is possible using the simulation of thermal processes that occur during fire exposure to the studied samples. There is a certain number of models of the thermal state of multilayer partitions with mineral wool plates of different levels of complexity and purpose. However, in these models there are parameters that are individual for each partition and are known with insufficient accuracy.\u0000The authors provided an improved mathematical model of heat conduction in partitions, the difference of which is the application of heat transfer coefficients from the unheated surface of the partition in boundary conditions. A comparison of the fire resistance limits for a partition made of a sandwich panel indicates a strong influence of the accuracy of setting the heat transfer coefficient on the dependence of the thickness of the partition on the fire resistance limit. The accuracy of the task of the heat transfer coefficient on the dependence of the thickness of the partition on the fire resistance limit was scientifically substantiated, which showed a strong influence of the boundary condition describing the processes of heat transfer on the surface of the partition, which is not heated, on the accuracy of determining the limits of fire resistance of the structure under study. The influence of the accuracy of the assignment of the coefficient of heat transfer from the object to the environment on the fire resistance of the investigated building structures, which during the test are subject to both natural (mobility) of air and forced blowing, as, for example, during tests of air ducts with fire protection, must be taken into account convectively radiation heat exchange, which will allow to obtain the most accurate result regarding the determination of their fire resistance characteristics.\u0000Keywords: fire-resistance, methodological support, parameters, modeling.","PeriodicalId":121805,"journal":{"name":"Municipal economy of cities","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121290386","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}

{"title":"MODERN TECHNOLOGIES FOR APPLYING ACRYLIC COMPOSITION TO THE SURFACE OF CONCRETE TO CONNECT BUILDING STRUCTURES","authors":"N. Zolotova","doi":"10.33042/2522-1809-2023-1-175-52-57","DOIUrl":"https://doi.org/10.33042/2522-1809-2023-1-175-52-57","url":null,"abstract":"The article reviews and analyzes modern equipment and technological solutions for applying an acrylic composition to a concrete surface, the composition of which was developed at the O.M. Beketov Kharkiv National University of Urban Economy. The composition is used to connect concrete building structures in the construction of building facilities. The adhesive and cohesive properties of acrylic compositions make it possible to reduce the time required to put facilities into operation, and to carry out repair and restoration work practically without stopping production.\u0000The joints of concrete building structures using acrylic compositions are characterized by more efficient parameters compared to known solutions using other adhesive compositions. The use of acrylic adhesive compositions helps to reduce the time of construction, reconstruction and repair of buildings and structures, save material, labor and financial resources, which is most important when repairing and reconstructing existing buildings and structures for various purposes.\u0000 The article discusses the application of an acrylic composition to the surface of old concrete with large volumes of work - by a mechanized method. \u0000It is determined that for a more efficient connection of building structures, it is most expedient to use acrylic compositions developed and proposed for use in construction by scientists аt the O. M. Beketov National University of Urban Economy in Kharkiv \u0000The article focuses on the application of acrylic compositions to the surface of old concrete with large volumes of work - by a mechanized method. \u0000It is proved that it is advisable to use the AIRMIX technology, which is a combination of two methods of pneumatic and airless (AIRLESS) spraying of materials on any surface of a building structure. \u0000It has been determined that the use of Airmix equipment sets is characterized by quite high performance when applying an acrylic composition to the concrete surface, such as material efficiency, quality of the resulting layer, and high productivity of the work performed.\u0000Keywords: acrylic composition; building structures, spray-gun, Airmix pneumatic spraying, high-pressure airless spraying (Airless).","PeriodicalId":121805,"journal":{"name":"Municipal economy of cities","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128433126","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}

{"title":"METHOD OF DETECTING CENTRAL SIGNS OF EMERGENCY SITUATION DUE TO FIRE AT CRITICAL INFRASTRUCTURE FACILITIES","authors":"O. Shcherbak, O. Derevyanko, O. Neshpor, R. Shevchenko","doi":"10.33042/2522-1809-2023-1-175-105-111","DOIUrl":"https://doi.org/10.33042/2522-1809-2023-1-175-105-111","url":null,"abstract":"The work is devoted to the solution of an actual scientific task in the field of civil protection, namely, the development of a method for detecting focal signs of an emergency situation due to a fire at critical infrastructure facilities, with the aim of further developing a method of preventing terrorist emergencies at critical infrastructure facilities of Ukraine.\u0000In order to solve the set goal, it is necessary to: provide a description and carry out planning of the procedure for conducting a full-scale experiment to determine the focal signs of an emergency situation due to a fire at critical infrastructure facilities; determine requirements for equipment for measuring focal signs of an emergency situation due to fire at critical infrastructure facilities; determine the general conditions for the formation of an algorithm for the method of detecting focal signs of an emergency situation due to a fire at critical infrastructure facilities; provide recommendations on the possible use of the received information during the reconstruction of an emergency situation due to a fire at a critical infrastructure facility.\u0000This work is a continuation of the cycle of previous works on the development of structural, logical and mathematical models for managing an emergency situation of a terrorist nature at an object of the critical infrastructure of Ukraine, which is protected, which are intended for the development and constant implementation of procedures of an organizational and technical nature that ensure the safety of the object.\u0000Thus, the interpretation of the results of the measurement of electrical resistance must be accompanied by an analysis of the specifics of the volume-planning decisions of the building (premises), the conditions of air exchange, the distribution of the fire load in the center of an emergency situation due to a fire.\u0000The obtained results of the soot research can be used as part of the technical examination to reconstruct the process of the emergence and development of an emergency situation due to a fire at critical infrastructure facilities.\u0000Keywords: emergency situation, critical infrastructure object, technique, focal signs, thermal damage.","PeriodicalId":121805,"journal":{"name":"Municipal economy of cities","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126581317","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}

{"title":"RESEARCH OF MODERN EMERGENCY AND RESCUE EQUIPMENT FOR RESCUING PEOPLE FROM UNDER THE COLLAPSES OF BUILDINGS AND STRUCTURES","authors":"V. Prysiazhnyuk, V. Svirskyi","doi":"10.33042/2522-1809-2023-1-175-112-117","DOIUrl":"https://doi.org/10.33042/2522-1809-2023-1-175-112-117","url":null,"abstract":"This publication highlights the relevance of the use of modern emergency rescue equipment with the help of which it is possible to more effectively rescue people from under the rubble of buildings and structures. Examples of some emergency situations during which it was possible to use modern emergency rescue equipment for more effective rescue of people from under the rubble of buildings and structures of various purposes are given.\u0000 It is noted that the elimination of emergency situations and their consequences is one of the main tasks of civil protection and consists in the implementation of a complex of measures, which include emergency rescue and other urgent works, which are carried out in the event of emergency situations of man-made and natural nature and are aimed at stopping the action of dangerous factors, saving lives and preserving people's health, as well as localization of emergency zones.\u0000The term emergency rescue and other urgent works is given - these are works aimed at the search, rescue and protection of the population, the occurrence of destruction and material damage, the localization of the zone of influence of dangerous factors, the elimination of factors that make it impossible to carry out such work or threaten the lives of rescuers.\u0000Statistical data on fires in Ukraine for the period 2017-2022 are provided, as well as the annual death toll of people and children using the example of 2022. It is noted about the main types of emergency and rescue equipment used during the liquidation of emergency situations, as well as the training and qualification of units that perform such tasks.\u0000The main technical characteristics of several types of mobile devices for effective cutting of various types of building structures are analyzed. Several modifications of mobile devices, possible equipment, structure and principle of operation, as well as the functions they can perform during the liquidation of emergency situations are given\u0000It is noted that the Institute of State Administration and Scientific Research on Civil Protection conducted testing and research of modern emergency rescue equipment at the fire-testing ground. Several working points are presented regarding the practical operation of the equipment, as well as the possibilities for cutting various types of building structures. It is also determined that the relevant divisions of the State Emergency Service of Ukraine need to be equipped with such equipment.\u0000Keywords: emergency and rescue equipment, mobile apparatus, cutting, drilling under water.","PeriodicalId":121805,"journal":{"name":"Municipal economy of cities","volume":"181 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123082432","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}

{"title":"THEORETICAL ASPECTS OF AVOIDING DELAMINATION OF COMPOSITE MATERIALS DURING STRENGTHENING OF REINFORCED CONCRETE STRUCTURES","authors":"P. Firsov, B. Kaafarani","doi":"10.33042/2522-1809-2023-1-175-32-38","DOIUrl":"https://doi.org/10.33042/2522-1809-2023-1-175-32-38","url":null,"abstract":"The scientific work is devoted to the improvement of the calculation methodology of reinforced concrete elements, using verification of the FRP delamination prevention, during structures strengthening with a system of composite materials (SCM) from various fibers types. During strengthening of reinforced concrete elements with composite material systems, the role of adhesion between concrete and FRP is of great importance due to the fragility of the failure mechanism due to delamination (loss of adhesion). The adhesion strength is generally much higher than the tensile strength of the concrete, so delamination always starts in concrete itself with the separation of FRP layer of different thickness. According to the load-bearing capacity requirements, such a failure mechanism should not precede the failure of the strengthened element during bending or shear. To solve the problem of possible strengthening delamination of composite materials systems, it is necessary to consider different failure modes of FRP. Due to imperfection of domestic building codes, a detailed analysis of the solution to the problem of FRP delamination was carried out in accordance with the recommendations of a number of foreign regulatory documents (ACI, CNR, FIB). The main failure modes, with subsequent initiation of delamination of FRP material from concrete base, are systematized, namely: FRP delamination due to surface irregularities, separation of FRP due to shear cracks, longitudinal shear stresses in the yield zone, excessive deformations in FRP material (FRP rupture), longitudinal shear stresses near the FRP edges, failure in anchoring (fixing) zone of FRP material. Six criterions are proposed that need to be verified during design of structures strengthening systems with FRP materials. During formulation of specified criterions, the main theoretical aspects necessary for application in structural calculations of the studied connection are given. The results of research can be used in future during the design of structures joints strengthening with systems of composite materials based on carbon fibers, glass, aramid.\u0000Keywords: system of composite materials, external reinforcement, FRP strengthening, reinforced concrete, failure mode, calculation, delamination.","PeriodicalId":121805,"journal":{"name":"Municipal economy of cities","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127860425","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}

{"title":"REQUIREMENTS FOR HAZARD ANALYSIS MODELS AND CALCULATIONS DEGREE OF RISK","authors":"O. Bogatov, V. Zaichenko, P. Bilym, A. Rogozin","doi":"10.33042/2522-1809-2023-1-175-202-207","DOIUrl":"https://doi.org/10.33042/2522-1809-2023-1-175-202-207","url":null,"abstract":"Based on statistical data, the main reasons for the low level of labor protection organization in Ukraine are formulated. In recent years, there has been a sharp increase in cases of industrial injuries. UAH 334 million was spent on monthly insurance payments to families who lost breadwinners. for temporary incapacity for work due to an accident or occupational disease - UAH 138.1 million. The data presented in the article indicate that the main causes of fatal accidents are organizational, psychophysical, technogenic, and technical. The main reasons for the low level of labor protection organization in Ukraine are given by the authors, who say that in today's conditions, the labor protection management system should be based not only on measures from the state, but also on the interest of the subjects of labor relations in maintaining the proper physical condition of the employee.\u0000A real health risk assessment is impossible without a sufficient information base on the quantitative and qualitative characteristics of risk factors and data on the health status of those contingents of the population that are exposed to these factors. The effect of potentiating with the combined influence of professional and non-professional factors has been established. Therefore, there was a need to develop new methods of analysis and modeling of the conditional probability of the occurrence of an industrial injury, acceptable for practical engineering calculations. The proposed indicators of the level of ensuring the safety of people at the objects are the probability of preventing exposure to dangerous factors of the production environment and work process, which can be determined by the full risk of an accident.\u0000Thus, on the basis of the application of the probabilistic method for modeling the conditional probability of injury to an employee during technological operations, an assessment of the probability of an accident and the development of various variants of dangerous situations was carried out. This will make it possible to get an assessment of the circumstances and conditions that contribute to the occurrence and development of traumatic situations at work.\u0000Keywords: labor protection, occupational injuries, industrial environment, accident, risk, danger, harmfulness, probability.","PeriodicalId":121805,"journal":{"name":"Municipal economy of cities","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130962521","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}

{"title":"INCREASING OF THE CORROSION RESISTANCE OF FIBERGLASS PLASTIC REINFORCEMENT THROUGH MODIFICATION OF THE POLYMER BINDER","authors":"P. Bilym, P. Firsov, S. Nadtochiy","doi":"10.33042/2522-1809-2023-1-175-47-51","DOIUrl":"https://doi.org/10.33042/2522-1809-2023-1-175-47-51","url":null,"abstract":"The issue of increasing the corrosion resistance of composite reinforcement, based on glass fiber and epoxy anhydride binder, is considered. The proposed samples of composite reinforcement were manufactured by needle extrusion technology. Glass fibers were evenly distributed in the channels and impregnated with a polymer binder based on epoxy resin. The amount of phenolic modifier in the polymer binder, according to the technological mode of obtaining composite reinforcement, was brought up to 5%. With a further increase in the content of the modifier, the degree of conversion of epoxy groups was no more than 70%, which sharply reduced the operational characteristics of the material. The overall ratio of polymer binder and glass reinforcement in the composite was ~ 60÷40. It was established that at low concentrations of the polymer modifier (up to 5 wt. parts), the processes of ordering and chemical grafting lead to compaction of the molecular grouping in the system, which in our case is characteristic of phenolic resins of the novolach and resol types. At the same time, under the conditions of the production technology, internal stresses in materials of this type increase sharply, which leads to the formation of surface defects (microcracks). At the tip of a crack or defect, sodium ions or other cations under the action of water undergo hydrolysis to form metal hydroxide, which, in turn, causes hydrolysis of siloxane bonds, thus weakening the mesh structure of silicon dioxide. The experimental activation energy was identified with the activation energy of sodium ion diffusion in the glass mass. But the plastic deformation of the glass in the region before the crack is very small, and instead of a uniform distribution of stress, the material cracks along the weakened centers The obtained data indicate that the action of the alkaline environment causes an increased loss of mass of the composite, both for the unmodified and for those modified with traditional phenolic resins. In turn, this ensures a high degree of penetration of alkalis into the volume of the material, access to reinforced fibers with their subsequent damage. To increase the corrosion resistance of composite reinforcement based on an epoxy anhydride binder, it is advisable to use a reactive sulfur-containing phenolic modifier. Its action is based on the ability to maintain the permissible monolithicity of fiberglass in the alkaline environment of concrete, the modulus of elasticity and necessary strength.\u0000Keywords: composite polymer reinforcement, fiberglass, alkaline environment, phenolic modifier.","PeriodicalId":121805,"journal":{"name":"Municipal economy of cities","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129042027","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}

{"title":"CHARACTERISTICS OF FACILITIES OF CRITICAL STATE INFRASTRUCTURE (FEATURES OF NUCLEAR AND OTHER STRATEGIC FACILITIES)","authors":"O. Azarenko, Yulia Honcharenko, M. Divizinyuk, R. Shevchenko, O. Shevchenko","doi":"10.33042/2522-1809-2023-1-175-160-168","DOIUrl":"https://doi.org/10.33042/2522-1809-2023-1-175-160-168","url":null,"abstract":"The work defines the objects of the state's critical infrastructure, their relationship with strategic and other dangerous objects and productions. It should be noted that today Ukraine, as a state that defends its independence in the war, faces many different tasks, one of which is the protection of critical infrastructure objects from military-terrorist influence, the solution of which not only saves the lives of civilians, but also ensures the defense of sovereignty, territorial integrity and independent existence of the state. The solution of this task is carried out both in wartime and in peacetime. The problem is to determine the objects of the state's critical infrastructure, in their correlation with strategic and other dangerous objects and productions, which in practice allows determining the priority of their protection in terms of the involvement of technical and material means.\u0000Based on the above, the purpose of this article is to determine the relationship between the terms critical infrastructure object, potentially dangerous object, dangerous production object and strategic object, from the standpoint of ensuring their security and countering terrorist threats.\u0000The concept of state infrastructure and the process of formation of the term critical infrastructure of the state are considered. The characteristics of the objects of strategic purpose are given. The meaning of the concepts of potentially dangerous, dangerous industrial and critically important objects is analyzed.\u0000It is proved that based on the assessment of the constituent parts of the state's critical infrastructure, the concepts of a potentially dangerous object, an object of hazardous production, a critically important object and a strategic object can be considered identical in relation to nuclear objects.\u0000Prolonging the reasoning in this way, it is possible to confirm the validity of this identity in relation to other objects of critical infrastructure, for example, hydro and thermal power, petrochemicals and others.\u0000Keywords: critical infrastructure object, nuclear object, terror, dangerous object, protection, concept.","PeriodicalId":121805,"journal":{"name":"Municipal economy of cities","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125673600","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}

{"title":"SCIENTIFIC AND PRACTICAL APPROACHES TO THE DETERMINATION OF SPATIAL PROVISION OF ENVIRONMENTAL MONITORING OF LAND USE IN THE URBAN ENVIRONMENT","authors":"V. Frolov","doi":"10.33042/2522-1809-2023-1-175-81-87","DOIUrl":"https://doi.org/10.33042/2522-1809-2023-1-175-81-87","url":null,"abstract":"The current state of spatial provision of ecological monitoring of land use in the urban environment is characterized by ambiguous theoretical and practical approaches, which are determined by regulatory rules and quantitative indicators. There are several problems that affect the spatial provision of ecological monitoring of land use in the urban environment.\u0000Stakeholder relations for the formation of strategic contours of environmental policy: are formed and implemented by:\u0000- implementation of education in the interests of balanced (sustainable) development, environmental education and upbringing, educational activities with the aim of forming environmental values in society and increasing its environmental awareness;\u0000- assessment of the attitude and raising the level of public awareness regarding the importance, benefits and tools of sustainable consumption and production, the state and values of biodiversity and the measures that must be taken for its preservation, restoration and sustainable use;\u0000- ensuring the practical implementation of the results of modern and fundamental ecological research and continuous interaction between scientists and state bodies; taking into account the recommendations of environmental scientific institutions when making management decisions and preparing drafts of normative legal acts;\u0000- development of partnership between sectors of society in order to involve all interested parties in the planning and implementation of environmental policy; ensuring public participation in management decision-making in the field of environmental protection and nature management;\u0000- ensuring compliance with the environmental rights and responsibilities of citizens, public access to justice in matters of environmental protection and nature use.\u0000The purpose of the article is to research modern approaches to determining the spatial provision of ecological monitoring of land use in the urban environment. As a result of the research, the proposed author's definition of spatial provision of ecological monitoring of land use in the urban environment as a system of formation and use of information provision and control over the use of information on the ecological state of land use in the urban environment with the use of modern technological means and geo-information systems, taking into account the peculiarities and directions of interaction with various by groups of interested persons (stakeholders), including state and local institutions, aimed at increasing the efficiency of land use and environmental safety.\u0000Special attention is paid to the study of the impact of ecological components on individual land plots, the peculiarities of their registration, the creation of land management documentation and the accumulation of cadastral information during the implementation of monitoring processes.\u0000Research has a significant place in the development of urban land use monitoring and the sustainable development of cities in general.\u0000Keywords","PeriodicalId":121805,"journal":{"name":"Municipal economy of cities","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134049785","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}

{"title":"ENERGY SAVING THROUGH IMPROVED TOPOLOGY OF THE CITY WATER NETWORK","authors":"V. Novokhatniy, O. Matyash, I. Usenko","doi":"10.33042/2522-1809-2023-1-175-99-104","DOIUrl":"https://doi.org/10.33042/2522-1809-2023-1-175-99-104","url":null,"abstract":"This article compares the operation of the existing water supply system in the city Kremenchuk, Poltava region, namely the giving-distributive complex (GDC), which includes the main water network and the pumping station of the 2-nd lift, with the GDC, in which the topological structure has been improved by introducing a new section of the network. During the operation of the GDC, the tasks of repairing or replacing pipes of individual sections the water network constantly arise. At the same time, attention should also be paid to the topological structure of the water network during its reconstruction. The need to improve the topological structure is clearly seen after performing hydraulic calculations and building piezometric maps. For comparison, piezometric maps need to build before and after the reconstruction of the water network. At the nodal points of the network, a geodetic mark, free pressure and piezometric mark are shown. Considering that water moves from a larger piezometric mark to a smaller one, the directions of water movement and water network nodes with minimal free pressures are determined. At the same time, flaws in the topological structure are found on the piezomap, which should be eliminated in order to increase its dependebility. It is known that dependebility includes 3 components: reliability, maintainability and durability. Durability is ensured by the choice of pipe material during design. If we take into account simultaneously reliability and maintainability, then a complex indicator should be used, namely, the availability factor Ka. It estimates the probability that at any given time the section of water network is in working condition. According to the topological structure, the water network of the city should be looped and have more connections between nodes. But in practice, this principle can not always be maintained, given the planning structure of the streets the city. Graphical representation of hydraulic calculations using piezomaps allows you to identify overloaded sections of the water network and increase its dependebility. When improving the topological structure, it is necessary to use the prof. Novokhatniy principle, namely, new sections must be introduced so that they unite the existing nodes of the existing water network. Hydraulic calculations have shown that by improving the topological structure of the water network the city Kremenchuk, the annual energy saving is about 452 thousand kWh, which corresponds to a saving of about UAH 2.7 million per year (at the cost of electricity 6 UAH per 1 kWh).\u0000Keywords: water supply system, giving-distributive complex, water network, topology, energy saving.","PeriodicalId":121805,"journal":{"name":"Municipal economy of cities","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115189034","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}