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Numerical Investigation of a Solar-Heating System with Solar-Tower Receiver and Seasonal Storage in Northern China: Dynamic Performance Assessment and Operation Strategy Analysis

Xiaoxia Li (lixx@lut.edu.cn), Husheng Qiu, Zhifeng Wang (wangzf@mail.iee.ac.cn), Jinping Li, Guobin Yuan, Xiao Guo and Lifeng Jin
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Xiaoxia Li: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Husheng Qiu: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Zhifeng Wang: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Jinping Li: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Guobin Yuan: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Xiao Guo: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Lifeng Jin: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China

Energies, 2023, vol. 16, issue 14, 1-27

Abstract: Solar-heating technology is a promising solution to help China achieve the “3060 double carbon” target as soon as possible. Seasonal thermal storage (STS) can effectively solve the mismatch problem of solar-heating systems between the supply and demand of thermal energy. Due to the instability of solar radiation resources and the heat demand, it is necessary to analyze the dynamic response characteristics and operation strategy optimization of the system in different operation stages. Yet, related studies are still scarce. The aim of this paper is to study the switching mechanism of the operation modes and the transitive relation of the system energy in different operation stages based on a pilot solar-heating system with STS in Huangdicheng, northern China. The impacts of different heating strategies on the system performance were also analyzed with a dynamic simulated method in TRNSYS. The results showed that the solar fraction of the system reached 89.4% in the third year, which was 3.6% higher than that in the first year. The quality–quantity heating operation strategies are effective ways to improve the discharge efficiency of the STS and the system performance without a heat pump. The electricity consumption of the pump on the heating side could be significantly reduced by 44.6% compared with the quality control. Ultimately, the findings in this paper are valuable for the optimization of the operation of solar-heating systems.

Keywords: solar-heating system; dynamic performance; seasonal thermal storage; underground-water-pit seasonal storage; operation strategies (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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