scholarly journals Process modelling of seasonal hot water supply heliosystem

2020 ◽  
Vol 164 ◽  
pp. 13009
Author(s):  
Yevgeniy Umerenkov ◽  
Elina Umerenkova ◽  
Ekaterina Pakhomova ◽  
Natalia Semicheva

A variant of the problem statement is proposed to develop an algorithm for calculating a solar collector of hot water supply for an individual dwelling. The purpose of the calculations is to determine the approximate values of the main characteristics of the heliosystem of hot water supply, which affect the technical and economic indicators of the system and determine the operating mode of the system, its comfort in use and maintenance.

2014 ◽  
Vol 889-890 ◽  
pp. 1333-1336
Author(s):  
Yu Fu ◽  
Kai Chen ◽  
Fei Ying Fu ◽  
Xin Bin Wang

Solar thermal collector converts solar radiation energy into useful thermal energy and transfers to a transport fluid flowing through the system. The collected energy can be used either direct to space or water heating equipment, or to a thermal storage for later use. Along with fast development, not only domestic hot water supply is needed, but also space heating and cooling are required. Also, limited roof space is another key barrier that should be considered. Furthermore, most of the building integration with solar collectors are mounted on the roof top by flat or tilt angle at present. It is considered to be a failure of low level architectural quality because the collector is used only for application and seems as an independent technical element of the building. With the consideration of the above, novel type of solar collector has been proposed to realize the utilization and offset the barriers. This novel solar collectors is especially suitable to supply domestic hot water, and combines with ASHP for multi-function, space heating and cooling as well as domestic hot water supply. Additionally, it is well integrated with high-rise residential buildings, which is good for aesthetic.


2021 ◽  
pp. 28-36
Author(s):  
С.С. Апоян

An urgent problem of the modern world is the global warming of the Earth, fraught with a climatic catastrophe. In addition, an important strategic task for Armenia is the issue of reducing the costly imported risky supplies of hydrocarbon and nuclear fuel and increasing the country's energy security. The Union of Armenian Ceramics Manufacturers has developed a new generation of ceramic heat-generating solar collector- plates, which allow converting solar energy into thermal energy of hot water in a more efficient, easily accessible and cheap way. Water heated in such an environmentally friendly and widely available way can be used for hot water supply (DHW) and additional auxiliary heating of premises. In Armenia, to obtain hot water for domestic and technical needs, electricity is used and hydrocarbon fuel is burned in an amount equivalent to USD 200...300 million per year. At the same time, tens of thousands of tons of carbon dioxide, water vapor and other greenhouse gases are emitted into the atmosphere. With the massive introduction of ceramic solar collector plates, for example, in the form of roof tiles or other facade elements, it is possible to obtain very cheap hot water for hot water supply and warm air for additional auxiliary heating of premises in the spring - autumn seasons of the year. The mass introduction of collector tiles (the so-called "heliofication" of buildings, countries) will save a significant amount of electricity, natural gas and other types of fuel for heating water, and significantly reduce the emission of greenhouse gases into the atmosphere. The large-scale introduction of solar roof tiles in several countries in the region is likely to help mitigate the global warming. The solarization of Armenia will also make it possible to reduce the expenditure of financial resources for the purchase of energy carriers and direct the saved funds to the development of the country's economy.


2018 ◽  
Vol 82 (1) ◽  
Author(s):  
Юрий Анатольевич Селихов ◽  
Виктор Алексеевич Коцаренко

Европейские страны демонстрируют высокие возможности простого преоб­разования солнечной энергии в тепловую энергию, которая может успешно использо­ваться для обеспечения различного рода технологических, отопительных и бытовых потребностей. Кроме того, ввод в эксплуатацию сол­нечных установок улучшает экологическую ситуацию района потребления тепловой энер­гии за счет снижения объемов выбросов загряз­няющих веществ, к которым относятся продукты сгорания органического топлива, используемого для производства тепловой энергии. В настоящее время в южных районах Украины уже используются солнечные установки для горячего водоснабжения и отопления. Однако, внедрение новых энергетических и экономически выгодных установок идет медленными темпами, что объясняется довольно высокими стоимостными показате­лями, как отечественных, так и зарубежных установок. Таким образом, на наш взгляд, является актуальной концепция создания новых солнечных установок, наиболее привлекательных для потенциаль­ного потребителя. Реализация данной кон­цепции возможна при таком варианте исполнения солнечных установок, когда затраты на выработку тепловой энергии с помощью этих установок будут ниже уровня суммарных затрат на получение тепловой энергии традиционными способами (в частности, в котельных установках). Однов­ременно с этим, срок окупаемости солнечных установок должен быть соизмерим с гарантийным сроком их эксплуатации. Для выполнения поставленных условий представ­ляется целесообразным разработка таких конструкций солнечных коллекторов, которые позволяли бы минимизировать затраты на их изготовление, монтаж и обслуживание. Это может достигаться за счет использования дешёвых отечественных материалов, выпуск которых гарантирован в достаточных объемах на протяжении длительного срока. Разработка, изготовление и внедрение двухконтурных солнечных установок позволило круглогодично эксплуатировать солнечный коллектор, но капитальные и эксплуатационные затраты при этом были  на таком уровне, что для полной окупаемости солнечной установки могло понадобиться более пяти лет, так как солнечные коллектора изготавливались из металла.  В рамках сформулированной задачи нами был разработан и изготовлен солнечный коллектор из полиэтиленовой пленки. Предлагается двухконтурная солнечная установка для горячего водоснабжения и отопления, у которой солнечные коллектора изготовлены из полиэтиленовой пленки. Такая установка разработана, изготовлена и запущена в эксплуатацию в одном южном регионе Украины. На установке были получены экспериментальные результаты работы установки в разных режимах в течение года. После обработки этих данных были получены обобщающие зависимости: плотности теплового потока от температуры теплоносителя в коллекторе, времени работы установки в течение светового дня и расхода теплоносителя; коэффициента полезного действия от плотности теплового потока; максимального коэффициента полезного действия от максимальной плотности теплового потока; количества теплоты при конвекции от скорости натекания ветрового потока от 1 до 6 м/с на внешнюю поверхность солнечного коллектора. Зависимости получены при разных объемных расходах V от 0,5 до 3,0 м3/ч теплоносителя. Максимальная погрешность проведенных расчетов не превышает 5 %.  European countries demonstrate high opportunities for simple conversion of solar energy into thermal energy, which can be successfully used to provide various types of technological, heating and domestic needs. In addition, the commissioning of salt plants improves the ecological situation in the area of consumption of thermal energy by reducing emissions of polluting substances, which include combustion products of organic fuel used for the production of thermal energy.  At present, solar installations for hot water supply and heating are already used in the southern regions of Ukraine. However, the introduction of new energy and economically advantageous plants is proceeding slowly, which is explained by rather high cost indices, both domestic and foreign installations.Thus, in our opinion, the concept of creating new solar installations that are most attractive to a potential consumer is relevant. Implementation of this concept is possible with such an option of solar installations, when the cost of generating thermal energy using these facilities will be lower than the total cost of obtaining thermal energy by traditional methods (in particular, in boiler plants). However, with this, the payback period of solar installations should be commensurate with the warranty period of their operation. To fulfill the set conditions it is advisable to develop such designs of solar collectors that would allow to minimize the costs of their manufacture, installation and maintenance. This can be achieved through the use of cheap domestic materials, the release of which is guaranteed in sufficient quantities over a long period. The development, production and implementation of dual-circuit solar installations allowed the solar collector to be operated year-round, but the capital and operating costs were at such a level that it would take more than five years to fully pay for the solar installation, since the solar collectors were made of metal. Within the framework of the formulated task, we developed and manufactured a solar collector made of polyethylene film. A double-circuit solar installation is proposed for hot water supply and heating, in which the solar collectors are made of polyethylene film. Such an installation is designed, manufactured and commissioned in one southern region of Ukraine. Experimental results of the installation in different modes during the year were obtained at the plant. After processing of these data, generalizing dependencies were obtained: the heat flux density from the coolant temperature in the collector, the operating time of the installation during the daylight and the flow of the coolant; coefficient of efficiency from the density of heat flow; the maximum efficiency from the maximum heat flux density; the amount of heat in convection from the rate of leakage of the wind flow from 1 to 6 m / s on the outer surface of the solar collector. Dependencies were obtained at different volumetric flows V from 0.5 to 3.0 m3 / h of the heat carrier. The maximum error in the calculations does not exceed 5%.


2022 ◽  
Vol 2150 (1) ◽  
pp. 012034
Author(s):  
P V Rotov ◽  
A A Sivukhin ◽  
M A Rotova ◽  
R A Gafurov ◽  
A V Gorshkov

Abstract The compliance of the actual heat consumption for heating cold water for public hot water supply service with the approved standard has been analyzed. Using passive engineering experiments, we studied the operating modes of hot water supply systems for several groups of houses, in which different methods for regulating water consumption in hot water supply systems were used. Data were collected using online energy monitoring and commercial metering system. Features of the static and dynamic load regulation of hot water systems have been investigated. The effect of methods for regulating the heat load of hot water supply systems on their actual heat consumption has been analyzed. An assessment has been made of the possibility of bringing the actual operating mode of the hot water systems to the specified value which is the basis for calculating the consumption rate. Ways to improve the efficiency of hot water supply systems have been determined. Conclusions have been drawn concerning the need to revise the standardized indicators of hot water quality and adjust the methodology for calculating the consumption rate in hot water supply systems.


Author(s):  
Ігор Гарасимчук ◽  
Павло Потапський ◽  
Олександр Козак ◽  
Олександр Думанський ◽  
Микола Вусатий

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