Energy and energy analysis of two-stage water tanks variable-volume thermal heat storage system for solar heating

doi:10.19799/j.cnki.2095-4239.2021.0563

Abstract

Abstract:

The constant-volume water tank thermal heat storage system has the problem of insufficient flexibility and mismatch between the solar energy supply and heat load demand in the solar heating system. To make use of solar energy, a MATLAB numerical model, the two-stage variable-volume stratified-temperature water tanks thermal heat storage solar heating system, was established and verified by Trnsys, which was included four cycles, the heat collecting cycle, the heat charging cycle, the heat discharging cycle, the heating cycle, and the corresponding control strategies. The concept of effective volume of thermal heat storage is proposed, which is the volume of the water tank actually involved in heat charge, heat discharge or both in a period of time. To analyze the system, heat collected ratio, average temperature of the effective volume of thermal heat storage, heat discharge to charge ratio of the water tank, and heat loss ratio are also put forward. The results show that, compared with the traditional constant-volume water tank thermal heat storage solar heating system, the heat loss of the two-stage variable-volume water tanks thermal heat storage solar heating system is reduced by 17.2%, heat discharge to charge ratio is increased by 6.3%, the exergy efficiency is increased by 6.6%, and the auxiliary heat is reduced by 9.5% in the whole heating season in Beijing. In the initial stage of heating, the temperature response time of the two-stage variable-volume water tanks thermal heat storage system is reduced by 54.9%, which can be used for heating more quickly. The two-stage variable-volume water tanks thermal heat storage system is beneficial to adjust the matching of supply and demand for heating in different periods, and has a good energy-saving effect, to further guide the design and operation of solar heating systems.

Key words: two-stage water tank, variable-volume, exergy, temperature difference control

CLC Number:

TK 513.5

Xiaoge LOU, Xin WANG, Pengfei SI, Xiangyang RONG. Energy and energy analysis of two-stage water tanks variable-volume thermal heat storage system for solar heating[J]. Energy Storage Science and Technology, 2022, 11(2): 538-546.

Figures/Tables 10

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