EXPERIMENTAL STUDY ON START-UP CHARACTERISTICS AND THERMAL PERFORMANCES OF NOVEL TWO-PHASE COLD ENERGY STORAGE SYSTEM

Guo Erbao; Xie Yuting; Yang Yang; Chen Sarula; Yao Wenting

doi:10.19912/j.0254-0096.tynxb.2025-0815

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (4) : 542-550. DOI: 10.19912/j.0254-0096.tynxb.2025-0815

EXPERIMENTAL STUDY ON START-UP CHARACTERISTICS AND THERMAL PERFORMANCES OF NOVEL TWO-PHASE COLD ENERGY STORAGE SYSTEM

Guo Erbao¹, Xie Yuting¹, Yang Yang², Chen Sarula^3,4, Yao Wenting¹

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Abstract

To address the inherent problems of high driving energy consumption and low heat exchange efficiency during the seasonal operation of existing energy storage systems driven by water pumps in charging and discharging processes, a novel two-phase passive cold energy storage system is proposed. An experimental platform is constructed to measure the temperature and pressure distributions under different filling rates and cold source temperatures with R22 and R410A as working fluids. The effects on the system start-up characteristics and thermal performance are analyzed, and the temperature distribution characteristics within the cold energy storage body are obtained. The results show that the temperature of the system loop decreases with the decrease of the cold source temperature. When the cold source temperature decreases from -2 ℃ to -12 ℃, the outlet temperatures of the condenser for R22 and R410A decrease by 10.6 ℃ and 7.1 ℃, respectively; The filling rate exerts a significant influence on the circulation of the working fluid. Within the experimental range, the minimum cold energy transfer resistances of R22 and R410A are 0.090 ℃/W and 0.097 ℃/W, which occur at filling rates of 50% and 70%, respectively; After 14 days of operation, the overall temperature of the water tank remains below 3.8 ℃, demonstrating a favorable cold energy storage performance. This study provides a theoretical basis for the further optimal design and application research of passive cold energy storage systems.

Key words

stored energy / cold storage / passive cooling / two phase flow / thermal performance / heat transfer

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Guo Erbao, Xie Yuting, Yang Yang, Chen Sarula, Yao Wenting. EXPERIMENTAL STUDY ON START-UP CHARACTERISTICS AND THERMAL PERFORMANCES OF NOVEL TWO-PHASE COLD ENERGY STORAGE SYSTEM[J]. Acta Energiae Solaris Sinica. 2026, 47(4): 542-550 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0815

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