Characteristic analysis and parameter optimization of seasonal solar thermal storage heating system

In this study, the seasonal solar thermal storage and heating system in the Jilin region of China is considered, and a system model is established by using the TRNSYS software under the heat storage and heating modes. The operating characteristics of the system are analyzed during the complete heat storage and heating seasons, and the economic cost of the system is minimized by optimizing the ratio of the collector area to the water tank volume. The results show that most of the heat is stored in the system in May, and the maximum heat loss from the tank occurs in October. The maximum solar fraction is 47.85%, maximum heat loss rate of the water tank is 29.82%, and energy efficiency ratio of the system is 1.70. The optimized ratio of the heat storage tank volume to solar collector area is 4.5, energy efficiency ratio of the system is 1.67, and the annual cost is ¥441500.