Heat transfer performance of a two-phase closed thermosyphon with different inclination angles based on the core-tube monitoring

Wang, Yingmei; Wang, Xi; Wang, Juncheng; Liu, Yongheng; Chen, Ji

doi:10.1016/j.csite.2023.102738

Cited by 4 publications

(1 citation statement)

References 34 publications

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“…The driving power of this HP is the capillary force generated by the wick. The other is gravity (gravity-assisted) HP (GHP) [32], or so-called wickless HP and two-phase closed Processes 2023, 11, 3081 4 of 57 thermosyphon (TPCT) [58], as shown in Figure 1b. This type of HP has a smooth inner wall and is driven by gravity force [59].…”

Section: Thpmentioning

confidence: 99%

The Review of the Application of the Heat Pipe on Enhancing Performance of the Air-Conditioning System in Buildings

Yuan,

Liu,

Zhang

et al. 2023

Processes

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An air-conditioning system (ACS), which consumes large amounts of high-grade energy, is essential for maintaining the indoor thermal environment of modern buildings. However, an ACS consumes almost half of the total energy of the building. Therefore, it is necessary to reduce the energy consumption of the ACS to promote energy conservation and emission reduction in the building sector. In fact, there is an abundance of waste heat and low-grade energies with the potential to be utilized in ACS in nature, but many of them are not utilized efficiently or cannot be utilized at all due to the low efficiency of thermal energy conversion. Known as a passive thermal transfer device, the application of a heat pipe (HP) in the ACS has shown explosive growth in recent years. HPs have been demonstrated to be an effective method for reducing building cooling and heating demands and energy consumption in ACS with experimental and simulation methods. This paper summarizes the different HP types applied in the ACS and provides brief insight into the performance enhancement of the ACS integrated with HP. Four types of HPs, namely tubular HP (THP), loop HP (LHP), pulsating HP (PHP) and flat HP (FHP), are presented. Their working principles and scope of applications are reviewed. Then, HPs used in natural cooling system, split air conditioner (SAC), centralized ACS (CACS) and cooling terminal devices are comprehensively reviewed. Finally, the heat transfer characteristics and energy savings of the above systems are critically analyzed. The results show that the performance of the HP is greatly affected by its own structure, working fluid and external environmental conditions. The energy saving of ACS coupled with HP is 3–40.9%. The payback period of this system ranges from 1.9–10 years. It demonstrates that the HP plays a significant role in reducing ACS energy consumption and improving indoor thermal comfort.

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Section: Thpmentioning

confidence: 99%

The Review of the Application of the Heat Pipe on Enhancing Performance of the Air-Conditioning System in Buildings

Yuan,

Liu,

Zhang

et al. 2023

Processes

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Experimental research on the cooling effect of a novel two-phase closed thermosyphon with semiconductor refrigeration in permafrost regions

Liu,

Chen,

Wang

et al. 2024

Case Studies in Thermal Engineering

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Experimental investigation of heat transfer characteristics of inclined aluminium two phase closed thermosyphon

Mutalikdesai,

Kate,

Shinde

et al. 2023

Kerntechnik

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A reduction in the size of electronic equipment increases the heat generation rate. Failure of electronic equipment occurs if the heat is not dissipated properly. This paper examines the performance of aluminium two-phase closed thermosyphon for cooling electronic equipment. Acetone charged aluminium two-phase closed thermosyphon was fabricated with an inside diameter of 17.05 mm and 1 mm thickness. A series of experimentations were performed for inclination angles of 10°–90° at selected filling ratios of 30, 60 and 100 %, along with heat inputs of 100, 200 and 300 W. The condenser section flow rate of water was maintained constant. Minimum thermal resistance was obtained at a 30° inclination angle for all filling ratios and heat inputs. The evaporator and condenser sections have a maximum heat transfer coefficient at a 30° inclination angle. Thermosyphon, with a 30 % or 60 % filling ratio, performed better than a 100 % filling ratio for all inclination angles and heat inputs. As the heat input was increased, the heat transfer coefficients of the evaporator and condenser section were increased, whereas total thermal resistance decreased. For 300 W heat input and 30 % filling ratio, the minimum thermal resistance at a 30° inclination angle was 0.158 °C/W. It is found that, the same heat input and filling ratio, the maximum heat transfer coefficient value for the evaporator and condenser section at a 30° inclination angle was 1602 W/m2 °C and 5652 W/m2 °C, respectively.

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Heat transfer performance of a two-phase closed thermosyphon with different inclination angles based on the core-tube monitoring

Cited by 4 publications

References 34 publications

The Review of the Application of the Heat Pipe on Enhancing Performance of the Air-Conditioning System in Buildings

The Review of the Application of the Heat Pipe on Enhancing Performance of the Air-Conditioning System in Buildings

Experimental research on the cooling effect of a novel two-phase closed thermosyphon with semiconductor refrigeration in permafrost regions

Experimental investigation of heat transfer characteristics of inclined aluminium two phase closed thermosyphon

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