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Постійне посилання колекціїhttps://dspace.nuft.edu.ua/handle/123456789/7522
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Документ Optimization strategy for system management of cold thermal energy storage (CTES) in conditions of dynamic changes in energy carrier value(2024) Gryshchenko, Roman; Forsyuk, Andriy; Ivashchenko, Nataliia; Kryvosheiev, Maksym; Pylypenko, OleksiiIn the world of contemporary challenges involving the continual increase in demand for energy resources and corresponding environmental pollution, the necessity has arisen to develop and implement advanced technologies to reduce energy consumption. This calls for enhancing energy utilization efficiency and op-timizing energy generation systems, taking into account the utilization of alternative and renewable ener-gy sources.Specifically, thermal energy storage becomes crucial as an effective economic option. Ther-mal energy storage systems enable meeting heating or cooling needs during optimal periods when it is more energy-efficient. Traditional management methods rarely prove optimal due to fluctuating electrici-ty tariffs, cooling loads, and ambient temperature. This leads to suboptimal achievement of maximum savings in utilising thermal energy storage systems.In this work, the advantages of Cold Thermal Energy Storage (CTES) systems based on Ice Thermal Energy Storage (ITES) were analysed alongside existing management strategies implemented in most enterprises and buildings utilizing ITES. A simpli-fied engineering methodology for analysing the thermodynamic efficiency of CTES was proposed. It was determined that cold losses during exergy analysis during storage are caused by both losses through sur-faces and internal exergy losses (i.e., exergy consumption due to irreversibility within the reservoir). For modern systems, exergy losses encompass both external and internal components. As an example, if the heat transfer at the external surface temperature of the storage reservoir equals the ambient temperature, external exergy losses would be zero, while total exergy losses would be entirely due to internal consump-tion. Conversely, if heat transfer occurs at the liquid's temperature for storage, a greater portion of exer-gy losses will be due to external losses. In all cases, the cumulative exergy losses, comprising internal and external exergy losses, remain constant.The implementation of CTES allows for shifting the use of electrical energy from peak to off-peak hours. During off-peak hours, electrical energy is used to charge the storage to fulfil (fully or partially) the peak demand for refrigeration equipment. Ice-based ITES has the potential to reduce maximum energy consumption, peak demand, and most importantly, the average cost of energy consumed.Документ Акватроніка в системах подачі рідких харчових продуктів ліній пакування(2021) Якимчук, Микола Володимирович; Гавва, Олександр Миколайович; Токарчук, Сергій Володимирович; Якимчук, Владислав МиколайовичУ статті розглядається можливість використання установки «Акватронік —Фесто» як фізичної моделі, яка відображає реальні процеси подачі рідкого харчового продукту та систем керування енерговитратами. Автори за допомогою фізичної моделі «Акватронік — Фесто» провели експериментальні дослідження та проаналізували величину споживанням енергії на переміщення рідкого харчового продукту в системах подачі як функцію керування енерговитратами. Наведені результати експериментальних досліджень показують залежність зміни величини місцевих опорів як функції енерговитрати системи подачі рідкого харчового продукту. За результатами досліджень доведено, що регулярні заходи з обслуговування систем подачі рідких харчових продуктів у лініях пакування забезпечують безперебійну і безвідмовну роботу насосів та іншого обладнання, а впровадження нових регульованих систем керування — зменшують енерговитрати. Отримані результати доцільно використовувати при створенні нових енергоощадних систем подачі рідких харчових продуктів на лініях пакування. The quality of liquid food packaging is inextricably linked with innovations in the development of technological packaging equipment and the qualification of production staff. One of the innovative directions of development of new packaging systems is the modernization of liquid food supply systems. Designing the latest liquid food supply systems in packaging lines require from designers engineering knowledge to ensure energy efficiency and reliability of their work. The importance of developing and systematizing such knowledge led to the creation of a new branch of science — aquatronics. According to the terminological definition, "aquatronics" is a synergistic combination of structural elements, technologies, energy and information flows for effective management of energy and water resources. The main directions of aquatronics are the study of new methods of control and management of the automatic process of fluid supply, taking into account energy-saving technologies of consumption. The article considers the possibility of using training equipment "Aquatronic — Festo" as a physical model that reflects the real processes of liquid food products supply and energy management systems. Using the physical model "Aquatronic — Festo", the authors conducted experimental studies and analyzed the amount of energy consumption for the movement of liquid food products in the systems as a function of energy management. The presented results of experimental researches show the dependence of the change in the value of local resistances as a function of the energy consumption of the liquid food supply system. Research has shown that regular maintenance of liquid food products supply systems in packaging lines ensures uninterrupted and trouble-free operation of pumps and other equipment, and the introduction of new regulated control systems — reduces energy consumption. It is expedient to use the received results at creation of new energy saving systems of giving of a liquid food product in packing lines.