Modeling on dynamic thermal performance of thermosyphon integrated latent thermal energy storage condenser (TLTESC)

Lijun Liu, Quan Zhang and Sikai Zou

Energy, 2025, vol. 318, issue C

Abstract: As a passive heat transfer device, thermosyphon is a promising technology for energy saving and adaptive cooling. Thermosyphon integrated latent thermal energy storage condenser (TLTESC) is intended to be applied in data center for emergency cooling and energy saving. To investigate the thermal performance of TLTESC, a quasi-steady numerical model is established. The layered thermal resistance model is used for the LTES condenser. The start-up factor is proposed to amend the start-up stage of the TLTESC. Several two-phase evaporative heat transfer formulas are compared with the experimental data; the Shah formula that obtains the least error of 6.8 % is selected. The refrigerant mass distribution is analyzed, and considering the refrigerant state in different parts, a new parameter for representing the refrigerant filling mass in thermosyphon is recommended. To compensate for parameters that cannot be measured during the experiment, the evolution of the refrigerant qualities at typical locations are clearly given and analyzed. Finally, the distribution of pressure loss in different parts of thermosyphon are investigated. Frictional pressure losses in the evaporator and condenser occupy the largest proportion. Gravity pressure loss in the evaporator is third biggest, and small vertical length of evaporator is suggested.

Keywords: Thermosyphon; Dynamic characteristics; Phase change material; Quasi-steady model; Refrigerant distribution (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:318:y:2025:i:c:s0360544225003810

DOI: 10.1016/j.energy.2025.134739

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