STUDY OF HEAT AND POWER SYSTEMS WITH SEASONAL HEAT ACCUMULATORS WITH CRYSTALLISATION OF THE COOLANT

A comprehensive mathematical model of a heat supply system that uses the energy of a seasonal heat accumulator with the possibility of crystallization of the heat carrier has been developed. The model takes into account the mutual influence of the electromechanical and thermal-technical components o...

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Збережено в:
Бібліографічні деталі
Дата:2024
Автори: Popovych, O., Golovan , I.
Формат: Стаття
Мова:Ukrainian
Опубліковано: Institute of Renewable Energy National Academy of Sciences of Ukraine 2024
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Онлайн доступ:https://ve.org.ua/index.php/journal/article/view/485
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Назва журналу:Vidnovluvana energetika

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Vidnovluvana energetika
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Резюме:A comprehensive mathematical model of a heat supply system that uses the energy of a seasonal heat accumulator with the possibility of crystallization of the heat carrier has been developed. The model takes into account the mutual influence of the electromechanical and thermal-technical components of the system and is intended to determine the effective ratio of design and operating parameters of the system with a thermal accumulator with and without crystallization. As a criterion for the energy efficiency of the system variant, we used a reduction in energy consumption from the electrical grid during the heating season, compared to that of a system with a heat pump that takes energy from the atmosphere. The ratio of the cost of saving electricity and thermal insulation of the seasonal heat accumulator is used to assess the efficiency of capital investments. Variants of the system with seasonal thermal accumulators are investigated: with water in a liquid state when the range of its operating temper-atures changes; taking into account the heat of crystallization of the entire volume of water or its half. The study was performed for variants of changing the required energy for heating by a factor of 10 and 100. The regularities of power and temperature changes during the heating season and the integral values of efficiency criteria are determined. It is shown that the use of a thermal accumulator with water in a liquid state can increase the energy efficiency of the system by up to two times. The influ-ence of using the heat of crystallisation of the entire volume of water on the change in the required volume of the heat accumula-tor, the values of energy and resource efficiency indicators is determined. The option with crystallization is inferior to the option with water in a liquid state in terms of energy and resource efficiency, but prevails in terms of the required size of the accumula-tor. For the variant with the crystallisation of half the volume of water, the synergistic effect of obtaining drinking water purified by defrosting was investigated, showing the possibility of improving the resource efficiency indicators by 2.5...8.5 times, which can reduce the payback period for thermal insulation costs by up to several months.