Thermal performance of a thermosyphon heat pipe evacuated tube solar collector using silver-water nanofluid for commercial applications

Özsoy, Ahmet; Çorumlu, Vahit

doi:10.1016/j.renene.2018.01.031

Cited by 161 publications

(39 citation statements)

References 54 publications

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“…The vapor pipe (14) is connected to the top zone of the separator (1), and the downcomer pipe (6) is connected to the bottom zone of the separator. The other end of the downcomer pipe (6) is connected to the heat exchanger (8) in the water hot water tank (7). The hot water tank (7) has a volume of 25 liters, it is thermally insulated and equipped with an electric stirrer to prevent liquid stratification inside the tank.…”

Section: Methodsmentioning

confidence: 99%

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A New Concept and a Test of a Bubble Pump System for Passive Heat Transport from Solar Collectors

Chludziński

Duda

2020

Energies

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Heat is usually transported by hydraulic circuits where the working medium is circulated by an electric pump. Heat can also be transferred by natural convection in passive systems. Passive systems where heat is transported downward have also been described and studied in the literature. These types of devices are referred to as reverse thermosiphons. However, systems of the type are not widely applied in practice due to the problems associated with the selection of the optimal working medium. In water-based thermosiphons, negative pressure is produced when water temperature falls below 100 °C, and non-condensable gas can enter the system. These problems are not encountered in systems where the working medium has a low boiling point. However, liquids with a low boiling point can be explosive, expensive, and harmful to the environment. The solution proposed in this paper combines the advantages of water and a liquid with a low boiling point. The described system relies on water as the heat transfer medium and small amounts of a substance with a low boiling point. The developed model was tested under laboratory conditions to validate the effectiveness of a passive system where heat is transported downward with the involvement of two working media. The system’s operating parameters are also described.

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Section: Methodsmentioning

confidence: 99%

“…A two-phase thermosiphon with a liquid heat exchanger supports passive downward transport of heat across greater distances [8,9]. In this solution, condensate does not have to be lifted.…”

Section: Introductionmentioning

confidence: 99%

A New Concept and a Test of a Bubble Pump System for Passive Heat Transport from Solar Collectors

Chludziński

Duda

2020

Energies

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“…Ozsoy et al [30] conducted a set of experiments to quantify the TP of a thermosyphon HP with a potential to be used in an ETSC. Silver-water nanofluid was used in the system with the view to evaluate its potential application for a continuous operation in the system.…”

Section: Introductionmentioning

confidence: 99%

Potential of Solar Collectors for Clean Thermal Energy Production in Smart Cities using Nanofluids: Experimental Assessment and Efficiency Improvement

et al. 2019

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In this article, an experimental study was performed to assess the potential thermal application of a new nanofluid comprising carbon nanoparticles dispersed in acetone inside an evacuated tube solar thermal collector. The effect of various parameters including the circulating volumetric flow of the collector, mass fraction of the nanoparticles, the solar irradiance, the tilt angle and the filling ratio values of the heat pipes on the thermal performance of the solar collector was investigated. It was found that with an increase in the flow rate of the working fluid within the system, the thermal efficiency of the system was improved. Additionally, the highest thermal performance and the highest temperature difference between the inlet and the outlet ports of the collector were achieved for the nanofluid at wt. % = 0.1. The best tilt angle and the filling ratio values of the collector were 30° and 60% and the maximum thermal efficiency of the collector was 91% for a nanofluid at wt. % = 0.1 and flow rate of 3 L/min.

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“…Their review is structured in three different parts: the first part focuses on the latest results about thermal conductivity, viscosity, specific heat and thermal expansion coefficient reported in literature; the second part focuses on the applications of nanofluids in different solar systems as solar collectors, photovoltaic systems, thermal energy storage systems; in the third part, they discussed about the challenges and the bio-engineering safety concerns of using nanofluids. Analytical and numerical investigations are carried to evaluate the thermal performance [9][10][11][12][13]. Kasaiean et al [9] in their work consider nanofluid as the heat transfer medium.…”

Section: Introductionmentioning

confidence: 99%

“…Many experimental investigations carried out to evaluate properties of solar collectors with nanofluids such as efficiency, thermal conductivity and heat transfer coefficient [13][14][15]. Ozsoy and Corumlu [13] carried out an experimental analysis to evaluate thermal efficiency of a thermosiphon heat pipe evacuated tube solar collector using silver-water nanofluid for commercial applications. They noted that nanofluid working fluid increased the efficiency of solar collector between 20.7% and 40% compared with the pure water.…”

Section: Introductionmentioning

confidence: 99%

Application of nanofluids in solar cooling system: Dynamic simulation by means of TRNSYS software

Buonomo¹,

Cascetta²,

Cirillo³

et al. 2018

MMC_B

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Convective heat transfer can be enhanced passively by using fluids with high value of the thermal conductivity. An innovative method of enhancement of thermal conductivity of base fluids is to insert nanoparticles. In recent years, nanofluids and their possible applications have been extensively studied. In this study, simulation based on a performance analysis of a solar cooling system is carried out by means of TRNSYS. First the analysis determines the peak energy demand for a building located in Naples. Beside, for the same configuration of solar system both pure water and Al2O3/water based nanofluids are considered as working fluids. Different values of volume nanoparticles concentrations, equal to 3%, and 6%, are investigated. The configuration is fully modelled in TRNSYS and dynamic simulations are run for the entire year. Various performance factors such as useful energy gain from collector, solar fraction, primary energy savings and pumping consumption are evaluated. Simulations results demonstrate that for the whole summer season, using nanofluids as working fluid, always higher primary energy savings results. Besides, solar fraction, difference between nanofluids with nanoparticles concentration of 3% and 6% is estimated to be marginal. In terms of PEC and primary energy savings, nanofluids with nanoparticles concentration of 6% has presented higher values.

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Thermal performance of a thermosyphon heat pipe evacuated tube solar collector using silver-water nanofluid for commercial applications

Cited by 161 publications

References 54 publications

A New Concept and a Test of a Bubble Pump System for Passive Heat Transport from Solar Collectors

A New Concept and a Test of a Bubble Pump System for Passive Heat Transport from Solar Collectors

Potential of Solar Collectors for Clean Thermal Energy Production in Smart Cities using Nanofluids: Experimental Assessment and Efficiency Improvement

Application of nanofluids in solar cooling system: Dynamic simulation by means of TRNSYS software

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