SIMULATION OF RENEWABLE ENERGY SYSTEMS WITH SEASONAL HEAT ACCUMULATORS

• Datum: 2023
• 1. Verfasser: Popovych, О.
• Format: Artikel
• Sprache: Ukrainisch
• Veröffentlicht: Institute of Renewable Energy National Academy of Sciences of Ukraine 2023
• Schlagworte: seasonal thermal accumulator; complex mathematical model; complex efficiency criterion; iteration method
• Online Zugang: https://ve.org.ua/index.php/journal/article/view/419
• Назва журналу: Vidnovluvana energetika

A complex mathematical model for optimizing the parameters of structures and regimes of renewable energy systems with seasonal thermal energy storage was developed, implemented and tested. A criterion for the efficiency of these systems has been developed, as the ratio of income from the sale of a unit of energy directed to accumulation to the cost of the heat-insulating material required for this. The mathematical model ensures the determination of the integral value of this criterion for the seasonal cycle of the heat accumulator, taking into account the combined effect of electromechanical and thermal equipment on the efficiency of the system. To start mathematical modeling, information is needed on the value of the heat storage energy utilization factor, as a ratio of energies: transmitted to the consumer and at its input, as well as on the nominal data of the heat pump compressor unit. The latter provides simulation of losses in it. These values are determined based on the results of the work cycle calculation for repeated iteration. The research algorithm provides various options for heat transfer from the thermal accumulator to the heat receiving system, depending on the ratio of their temperatures: with the help of both heat exchangers and heat pumps. The variable input parameters include: operating mode and amount of seasonal heat consumption, ambient temperature, heat accumulator temperature, consumer temperature, heating system temperature, thermal insulation parameters of the consumer and accumulator. With the help of the developed model, comparative studies of the efficiency of thermal accumulator systems in the form of a parallelepiped and a sphere, as well as for variations in the amount of stored energy, were performed.