Based on the dynamic simulation of the heat gain of the solar collector field and the temperature field of the water pit for solar seasonal heat storage, a dynamic thermal economy analysis model of the system is established in the TRNSYS simulation platform for the water pit for solar seasonal heat storage heating system, and the dynamic thermal performance and economic performance coupling analysis of the whole system is realized. This model is an important tool for sensitivity analysis and optimization of key parameters such as the aperture area of heliostat field, solar seasonal heating storage （SSHS） volume, geometric shape, mass flow of solar heat collection field and internal rate of return of funds. This study analyzes the sensitivity of the geometry of SSHS to the heat price including tax, and draws the following conclusions： the heat loss of the water pit is related to the heat price including tax of the system and the ratio of height to diameter of the water pit in an upward opening parabolic-like relationship for the 10000 m3 class of cylindrical water pit for solar seasonal heat storage. When the ratio of height to diameter is 1∶2, the heat loss of SSHS is low, and the corresponding tax-included heat price is 0.470 CNY/kWh, which is 9.6% lower than the higher tax-included heat price. The heat loss of SSHS and the heat price including tax first decrease and then increase with the increase of SSHS height. When the height of SSHS is 19 m, the heat price including tax is 0.482 CNY/kWh, which is 13.0% lower than higher tax-included heat price.
Key words
solar energy /
seasonal heat storage /
dynamic simulation /
techno-economy /
water pit for heat storage
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