scholarly journals Development of technique and program for analysis of options for transition to a closed hot-water supply scheme for heat supply systems

2019 ◽  
Vol 21 (3) ◽  
pp. 126-134
Author(s):  
F. N. Gazizov ◽  
I. G. Akhmetova
Keyword(s):  
Water Supply ◽  
Heating System ◽  
Supply System ◽  
Hot Water ◽  
Operating Costs ◽  
Independent Variables ◽  
Hot Water Supply ◽  
Hot Water Supply System ◽  
Supply Systems ◽  
Transition Scheme

The article describes the prerequisites for development of methodology for integrated assessment of options for transition to a closed hot-water supply scheme. For analysis of promising options for transition to a closed system of hot water supply, criteria have been proposed that influence the choice of possible solutions. Block diagrams of boundary conditions and independent variables were created. A pyramid of indicators which affect the operating costs of heating system over 25 years of its operation was formulated. A method and a program for selecting the optimal transition scheme to a closed hot-water supply system with calculation of weighting factors have been developed.

scholarly journals EFFICIENCY OF THERMAL ENERGY GENERATION BY COGENERATION PLANTS DUE TO THE MAXIMUM USE OF HEAT

2021 ◽  
Vol 7 (2(38)) ◽  
pp. 66-71
Author(s):  
Maxim Olegovich Maximov
Keyword(s):  
Water Supply ◽  
Thermal Energy ◽  
District Heating ◽  
Heating System ◽  
Heat Losses ◽  
Hot Water ◽  
Water Supply Systems ◽  
Hot Water Supply ◽  
Hot Water Supply System ◽  
Supply Systems

ignificant heat losses in centralized heating and hot water supply systems during the transportation of heat carriers lead to the need for decentralization of heat generating installations. It is shown that steam and gas installations for combined heat and power generation deserve the greatest attention. The ways of increasing the efficiency of cogeneration plants of various capacities based on CCGT by utilizing the heat of the heating system by installing recuperative heat exchangers on the return lines of the heating system after heating devices that are connected to the hot water supply network are substantiated, which makes it possible to reduce heat losses to the environment. The proposed system of rational interaction of the power plant with the heating and hot water supply system, which allows increasing the thermal efficiency of the cogeneration plant by 2%, which corresponds to a fuel saving of 3% due to the more complete use of the thermal energy of steam, which is sent as a selection for district heating. This article discusses solutions aimed at increasing the efficiency of heat generation by cogeneration plants by maximizing the use of heat from the exhaust steam of turbines.

scholarly journals Estimation of Solar Hot Water System Operation for a Residential Building

2021 ◽  
Vol 7 (1) ◽  
pp. 1-6
Author(s):  
Olena Savchenko ◽  
◽  
Zenon Savchenko
Keyword(s):  
Water Supply ◽  
Residential Building ◽  
Supply System ◽  
Water Supply System ◽  
Hot Water ◽  
Water Supply Systems ◽  
Solar Fraction ◽  
Hot Water Supply ◽  
Hot Water Supply System ◽  
Supply Systems

Solar hot water supply systems can provide a significant part of the thermal energy needed in the residential sector. The use of solar hot water supply systems can reduce the consumption of traditional energy sources and, consequently, reduce greenhouse gas emissions. The aim of this article is to assess the operation of the solar heating system operation to provide the needs of the hot water supply system of a residential building with thermal energy. The efficiency of a flat solar collector operating in a single-circuit thermosyphon system of solar heating of a residential building in Lviv has been established. The solar fraction of the hot water supply system of a residential building is determined depending on the volume of hot water consumed, in particular 50, 60, 70, 80, 90, 100 l/day. It is established that the lower the need for hot water, the greater the solar fraction of the solar hot water supply system. Thus, the average annual solar fraction of the solar hot water supply system with a daily consumption of 50 l/day is 0.77, and with a daily consumption of 100 l/day the solar fraction is 0.39. The average value of the solar fraction for the solar hot water supply systems of the studied house is 0.55.

scholarly journals Urban renovation of the hot water supply system

2017 ◽  
Vol 116 ◽  
pp. 02034
Author(s):  
Oleksandr Taraday ◽  
Oleksandr Gvozdetskiy ◽  
Sergii Fomich
Keyword(s):  
Water Supply ◽  
Supply System ◽  
Water Supply System ◽  
Hot Water ◽  
Urban Renovation ◽  
Hot Water Supply ◽  
Hot Water Supply System

A Hybrid Solar–Geothermal Heat- and Hot-Water Supply System

2021 ◽  
Vol 68 (7) ◽  
pp. 564-569
Author(s):  
A. B. Alkhasov ◽  
D. A. Alkhasova ◽  
M. G. Dibirov
Keyword(s):  
Water Supply ◽  
Supply System ◽  
Water Supply System ◽  
Hot Water ◽  
Geothermal Heat ◽  
Hot Water Supply ◽  
Hot Water Supply System

scholarly journals Analysis of procedures for heating, ventilation and air conditioning for transfer to low-temperature heat supply

2019 ◽  
pp. 8-8
Author(s):  
Stanislav Chicherin
Keyword(s):  
Water Supply ◽  
Heat Supply ◽  
Heating System ◽  
Heat Energy ◽  
Hot Water ◽  
Heat Consumption ◽  
High Quality ◽  
Hot Water Supply ◽  
Supply Systems ◽  
Selection Of

Introduction. Renovation of housing stock supposes construction of new buildings, where the main utilities consuming heat energy will be heating and hot water supply (HWS) systems. Under such conditions the task of heat consumption reduction by transfer to low-temperature and use of the associated procedures is relevant. Materials and Methods. Research was performed on the basis of residential and administration buildings designed within the whole Russia, the facilities were selected based on the year of putting into operation and their purpose. The source of data concerning buildings became documents included into the scope of the design and detailed documentation: plans, drawings and explanatory notes. As meeting the demands of hot water supply makes the main contribution to daily nonuniformities of heat energy consumption, the attention was paid to equipment of hot water supply systems. For calculations, the commercial product of Microsoft Office Excel 2010 was used. Results. During selection of roof boiler house as a source of heat supply increase in consumption of equivalent fuel in relation to the variant of connection to heat power plant operating on solid fuel by 187,314 tons of fuel oil equivalent is possible. General refusal from power-and-heat generation complicates operation of large district heat supply systems. The design parameters of coolant in building heating system differ from project to project: from 95/70 °С, used everywhere till the beginning of the XXI century, up to 90/65 °С corresponding to existing practice of designing or 80/60 °С as at the facility in Sevastopol. Reduction of design temperatures by 5 % is insufficient to decrease general heat consumption of the building. Reduction of heat consumption is explained by selection of advanced materials for pipeline heat insulation. Use of automation diagrams for heat points on the basis of regulator ECL Comfort 310 contributes to improvement of hydraulic control for heating systems, however, concealed automation results in violation of high-quality mode for heat network control and decrease of coolant parameters on adjacent (often non-automated) consumers. Conclusions. Supplement of central high-quality control by local constant temperature/variable flow control at individual heat unit and installation of temperature controllers on heating radiators with mechanical thermostatic head have potential for reduction of the heat energy volume used ineffectively. Increase in level of controllability for heating system together with cheaper and responsive automation systems are basic conditions for increase in quality of heat supply in future.

scholarly journals Piston compressor cooling system with a pulsed flow of coolant with subsequent use of heat in the hot water supply system

2021 ◽  
Vol 47 (4) ◽  
pp. 37-48
Author(s):  
A. Yu. Efimov ◽  
M. N. Saraikin ◽  
V. A. Efimov ◽  
E. V. Troshkin
Keyword(s):  
Water Supply ◽  
Cooling System ◽  
Piston Compressor ◽  
Supply System ◽  
Water Supply System ◽  
Hot Water ◽  
Pulsed Flow ◽  
Hot Water Supply ◽  
Hot Water Supply System

Цель. Большинство известных компрессоров используют механический привод от электродвигателя для достижения своей цели – перекачки необходимого потребителю количества сжатого воздуха. Во время работы любого компрессора прямого вытеснения выделяется большое количество тепла, которое вырабатывается как за счет трения движущихся частей блока, так и при сжатии воздуха.Метод. Предложена система охлаждения поршневого компрессора с импульсным потоком теплоносителя с последующим использованием тепла в системе ГВС при помощи пластинчатого теплообменника, зарекомендовавшего себя своей компактностью и эффективностью.Результат. С целью более глубокого отбора тепла в качестве типа движения нагреваемой линии был предложен импульсный поток, организованный при помощи ударного узла.Вывод. В качестве оценки системы было проведено сравнение с аналогичной системой со стационарным потоком, как по техническим параметрам (температура рубашки компрессора t руб. ; температура воздуха в ресивере tвозд. ; средняя тепловая мощность N ср. ; коэффициент теплопередачи K ; объём воздуха, перекачиваемый за 1 цикл Vвозд. ) так и по экономическим параметрам (время окупаемости установки по сравнению с аналогичной установкой со стационарным потоком Tок ).

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