Effect of valve regulation on the operating state of a CO2 two-phase thermosyphon loop

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-03-24 DOI:10.1016/j.csite.2025.106055

Zhen Tong, Wencheng Wang, Peng Wang, Zekun Han, Huili Yu, Songtao Hu

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引用次数: 0

Abstract

During the operation of two-phase thermosyphon loops (TPTLs), different types of oscillations may occur, affecting their safety and performance. Although existing research has preliminarily explored the use of valve regulation to eliminate oscillatory operations in TPTLs, the effects of valves on different types of oscillations have not been verified. In this study, valve regulation was applied to two types of oscillation in a CO₂ TPTL. The distinct effects of the valve on each type of oscillation were analyzed in conjunction with their respective mechanisms through experiment. For natural circulation oscillations, valve regulation can effectively suppress fluctuations within the loop. When the valve opening (θ) reduced from 100 % to 75 %, the TPTL transitioned from oscillatory to stable operation. However, the thermal performance of the TPTL remained nearly unaffected. For geyser boiling, valve regulation cannot alter the oscillatory operating state within the loop. Even when the θ was reduced from 100 % to 25 %, the TPTL remained in an oscillatory operating state. The results provide a deeper understanding of the influencing mechanisms of valve regulation and offer insights into the active regulation of TPTLs.

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.