EFFICIENCY OF THE BUFFER ACCUMULATOR OF THE HYDROTHERMAL HEAT PUMP SYSTEM AS A HEAT ENERGY ACCUMULATOR

• Дата: 2023
• Автори: Zurian, О., Oliynichenko, V.
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: Institute of Renewable Energy National Academy of Sciences of Ukraine 2023
• Теми: heat pump; heat pump system; heat supply; fan coil; conversion factor; тепловий насос; теплонасосна система; теплопостачання; фанкойл; коефіцієнт перетворення
• Онлайн доступ: https://ve.org.ua/index.php/journal/article/view/388
• Назва журналу: Vidnovluvana energetika

An urgent task in the design of complex local energy supply systems (cluster) using renewable energy sources (RES) is to take into account the experience of operating specific types of equipment in real conditions. The paper considers the possibility of effective use as an element of the energy cluster of the buffer storage system of the heat pump system as a thermal energy accumulator to provide multi-purpose objects with thermal energy. The buffer storage is a part of the low-capacity system for obtaining heat energy, which is part of the general system (unit), which consists of a buffer storage of the heat carrier, a heat pump and fan coils. The structural diagram of the energy cluster and the place of the low-capacity thermal energy production system in it are given.  The working layout of the experimental hydrothermal heat pump system developed and constructed at the Institute of Renewable Energy of the National Academy of Sciences of Ukraine, which includes a buffer storage device, is presented. The research methodology is described. The characteristics of the measuring equipment installed on the experimental setup, which was used to obtain data in the process of conducting research, are given. The results of research work, obtained in the course of theoretical calculations and conducted experimental studies of the effectiveness of the buffer storage of the hydrothermal heat pump system as a thermal energy accumulator, are outlined. The calculation of the conversion factor of the "water-to-water" heat pump in the heating system of a room with an area of up to 100 m2 with the use of fan coils and buffer storage of thermal energy of different capacities is given. The calculation of the required volume of the heat carrier and the capacity of the buffer storage, per one kilowatt of produced thermal energy, was performed to ensure the autonomous operation of the heat pump system, where it performs the function of a battery and a collector of thermal energy at the same time. A sufficient volume of coolant and battery capacity per kilowatt of thermal energy produced by the heat pump to ensure stable operation of the hydrothermal heat pump system as a whole was determined. It has been experimentally confirmed and theoretically substantiated that the buffer storage of the heat pump system is a necessary element of the system, it performs both the function of a shock absorber and significantly increases the efficiency of the heat pump system as a whole. Including the buffer storage device, depending on the thermal load, it can work independently as an autonomous source of low-potential thermal energy. Conclusions were made that further research on the possibility of use as a source to maintain the necessary energy potential in the buffer storage of the heat pump system, the solar system for heating water, has a perspective. But it is relevant to carry out research on the comparison of the efficiency of the complex operation of the solar system for heating water and the heat pump, where the heat exchange takes place: first, in the circuit of the evaporator of the heat pump; secondly, in the circuit of the condenser of the heat pump. The work was carried out as part of the scientific research work: "Development of energy clusters to provide multi-purpose objects with electric and thermal energy using renewable and hydrogen energy technologies (code: "Energy-guarantor")"