Heat transfer performance of two-phase closed thermosyphon with oxidized CNT/water nanofluids

Heris, Saeed Zeinali; Fallahi, Marjan; Shanbedi, Mehdi; Amiri, Ahmad

doi:10.1007/s00231-015-1548-9

Cited by 34 publications

(4 citation statements)

References 34 publications

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“…They showed a maximal reduction of 24% for thermal resistance in comparison of water as a working fluid. Recently, Heris et al [103] investigated the thermal performance of oxidized carbon nanotubes (CNT)/water nanofluids in a TPCT.…”

Section: Tpct: Experimental Devicesmentioning

confidence: 99%

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

Jafari

Franco

Filippeschi

et al. 2016

Renewable and Sustainable Energy Reviews

248

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Section: Tpct: Experimental Devicesmentioning

confidence: 99%

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

Jafari

Franco

Filippeschi

et al. 2016

Renewable and Sustainable Energy Reviews

248

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“…The effects of different acids on the thermal performance of oxidized carbon nanotubes (CNT)/water nanofluids in a TPCT were studied 30 . The TPCT was made of copper with length, outer diameter, and thickness of 450, 20, and 1 mm, respectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of closed‐loop thermosyphon with a different evaporator geometry

2020

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In this study, the effect of evaporator geometry on the loop thermosyphon's heat transfer coefficient is experimentally verified by using water as a working fluid with three filling ratios (50%, 70%, 90%), constant heat input (185 W), and condenser cooling water flow rate remaining constant at 2 Lpm. Three evaporator pipes are used (I: straight; II: helical coil evaporator with a diameter of 100-mm coil and two turns; III: helical coil evaporator with a diameter of 50-mm coil and four turns). From the experimental results, it can be observed that the performance of evaporator III is higher than the two other forms. A greater heat transfer coefficient value is found in case of type III evaporator and is equivalent to 2456 W/m 2 •°C. The maximum thermal resistance reduction occurs in the type III evaporator (37.32%), and the highest effective thermal conductivity for the same type is 6.123e + 05 W/m•°C. The experimental results demonstrate good agreement with the empirical equations.

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“…Number of studies is also devoted to utilization of the nanoparticles as additives to working fluid. For example in [15] a performance of a TPCT filled with water with small additive of silver nano particles and surfactant was examined or in article [16] where carbon nanotubes/ water nanofluidoxidized with acids was investigated. In both of the cited papers some significant improvements of thermal performance were shown.…”

Section: Introductionmentioning

confidence: 99%

Investigation of two-phase thermosyphon performance filled with modern HFC refrigerants

Górecki

2018

Heat Mass Transfer

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Two-phase closed thermosyphons (TPCTs) are widely utilized as heat exchanger elements in waste heat recovery systems and as passive heating/cooling devices. They are popular because of their high thermal conductivity, simple construction and reliability. Previous researches indicate that refrigerants are performing better than typical TPCT working fluids like deionized water or alcohols in the low temperature range. In the present study three HFC (Hydrofluorocarbons) refrigerants were tested: R134a, R404A and R407C. The total length of the investigated TPCT is 550 mm with equal length (245 mm) condenser and evaporator sections. Its outer diameter is 22 mm with 1 mm wall thickness. The evaporator section was heated by hot water with varying inlet temperature by 5 K step in the range of 288 K -323 K. The condenser was cooled by cold water with inlet temperature kept at a constant value of 283 K. It was found that using R134a and R404A as working fluids heat transfer rates are the highest. For both refrigerants 10% is optimal filling ratio. They can be utilized interchangeably because the differences between their throughputs are within uncertainty bands. R407C performance was 50% lower. Other disadvantages of using this refrigerant are relatively high working pressures and higher optimal filling ratio (30%).

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Heat transfer performance of two-phase closed thermosyphon with oxidized CNT/water nanofluids

Cited by 34 publications

References 34 publications

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

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

Experimental study of closed‐loop thermosyphon with a different evaporator geometry

Investigation of two-phase thermosyphon performance filled with modern HFC refrigerants

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