Two-phase closed thermosyphons: A review of studies and solar applications

Jafari, Davoud; Franco, Alessandro; Filippeschi, Sauro; Marco, Paolo Di

doi:10.1016/j.rser.2015.09.002

Cited by 247 publications

(50 citation statements)

References 119 publications

(177 reference statements)

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“…Nevertheless, the few studies listed by Jafari et al (2016) and Li and Lv (2016) which assessed the influence of cooling conditions on a thermosyphon or flat heat pipe thermal resistance found out similar trends with a degradation of the performance with a decrease of the saturation temperature.…”

Section: Influence Of Inclinationmentioning

confidence: 90%

“…However, today's requirements highlight their limitations in terms of heat transfer and temperature uniformity (Faghri, 2014). Two-phase thermosyphons, also known as wickless or gravity-assisted heat pipes, therefore emerged as an alternative for small-scale applications with better thermal performance (Jafari et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…In particular, TPCTs are very constrained regarding the heat source location: the evaporator section has to be at the same level than the liquid pool to avoid dry-outs of the liquid film, which requires a vertical positioning of the heat source below the condenser section, at the very bottom of the device (Jafari et al, 2016). TPCTs are also characterized by a high sensitivity to inclination since gravity ensures the condensate return to the evaporator.…”

Section: Introductionmentioning

confidence: 99%

“…However, classical thermosyphons used in solar or deicing systems need to be adapted to this type of application with limited available space; the consequent changes in both dimensions and geometry (especially the changing from cylindrical to flat geometry) are going to significantly affect the two-phase flow and thermal performance of the spreader (Jafari et al, 2016). The introduction of the confinement is also expected to induce major changes in the flow patterns and thermal resistance due to the strong coupling between boiling and condensation processes (Zhang et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of a confined flat two-phase thermosyphon for electronics cooling

Narcy

Lips

Sartre

2018

Experimental Thermal and Fluid Science

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A novel type of two-phase heat spreader based on a flat confined thermosyphon is proposed for electronics cooling applications. Two wickless flat copper-water heat pipes with an inner thickness of 3 mm were experimentally investigated for both two-phase flow visualizations and characterization of thermal performance. The effects of heat input, filling ratio, inclination and saturation temperature were studied. Experimental results show that the confinement of the fluid inside the heat spreader induces confined boiling phenomenon with a strong coupling between condensation and boiling mechanisms. They also highlight an enhancement of heat transfer and interesting performance such as high heat transfer capability (tested up to 30 W/cm² with a corresponding thermal resistance around 0.07 K/W at an optimum filling ratio), low sensitivity to inclination and higher degree of freedom on heat sources location compared to a classical thermosyphon.

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Section: Influence Of Inclinationmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental investigation of a confined flat two-phase thermosyphon for electronics cooling

Narcy

Lips

Sartre

2018

Experimental Thermal and Fluid Science

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“…Owing to the heat it gets from the evaporator section, the working fluid reaches the condenser region by rising from the interior of the pipe in the vapor phase. The working fluid leaves its heat and turns into liquid phase here and completes its cycle by going down to the evaporator section from the pipe surface in the form of film membrane owing to gravity [9].…”

Section: Figure 2 Dar2 [7]mentioning

confidence: 99%

Experimental Study Of Diffusion Absorption Refrigeration Systems Using Solar Energy

Özbaş¹

2018

Journal of Polytechnic

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ÖZBu çalışmada, güneş enerjisi kullanılarak difüzyon soğurmalı soğutma (DAR) sisteminin performansı deneysel olarak araştırılmıştır. Bu amaçla, deneyde ön soğutmalı / ön soğutmasız olmak üzere iki tip sistem kullanılmıştır. Enerji kaynağı olarak güneş enerjisinden faydalanmak amacıyla çalışma akışkanı su olan iki fazlı kapalı tip termosifon tip ısı borusu tercih edilmiştir. Deneyler sırasında; DAR sistemleri ve ısı boruları üzerindeki kritik nokta sıcaklıkları ile birlikte çevre sıcaklığı, DAR sistemleri basınçları ve güneş radyasyonu verileri 06:00-16:00 saatleri arasında kaydedimiş ve her ısı borusu ile 82.5W güneş enerjisi toplanmıştır. DAR1 en düşük buharlaştırıcı giriş sıcaklığına (-14.8°C) 14:40'da ve DAR2 ise 13:55'de -0.9°C'ye ulaşmıştır. DAR1 ve DAR2'nin STK değerleri 0.2362 ve 0.2254 olarak bulunmuştur. DAR1 ve DAR2'de kullanılan ısı borularının verimliliği sırasıyla 0.3677 ve 0.3690 ve ısı direnci değerleri sırasıyla 0.1154W/°C, 0.0828W/°C'dir.Anahtar Kelimeler: Yayınımlı soğurmalı soğutma, ısı borusu, güneş enerjisi, performans. ABSTRACTIn this study, the performance of a diffusion absorption refrigeration (DAR) system using solar energy is investigated experimentally. For this purpose, two types of systems with/without sub-cooling are used for the experiment. Two-phase closed thermosyphon type heat pipes using water as the working fluid are used to utilize solar energy as heat source. During the experiments; ambient temperature along with critical point temperatures on DAR systems and heat pipes, DAR systems pressures and solar radiation data are recorded from 06:00 to 16:00 and each heat pipe has collected 82.5W of solar energy. DAR1 has achieved its lowest evaporator inlet temperature (-14

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Pool Boiling

2021

Two‐Phase Heat Transfer

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Two-phase closed thermosyphons: A review of studies and solar applications

Cited by 247 publications

References 119 publications

Experimental investigation of a confined flat two-phase thermosyphon for electronics cooling

Experimental investigation of a confined flat two-phase thermosyphon for electronics cooling

Experimental Study Of Diffusion Absorption Refrigeration Systems Using Solar Energy

Pool Boiling

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