Study of Natural Convection Passive Cooling System for Nuclear Reactors

Abdillah, Habibi; Saputra, Geby; Novitrian, Novitrian; Permana, Sidik

doi:10.1088/1742-6596/877/1/012047

Cited by 12 publications

(6 citation statements)

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“…While the doublings of vertical length by 50%, 100%, 150%, 200%, and 250% significantly increase the flow rate by 64,35%, 102,48%, 125,90%, 147,53%, and 163,70%, respectively. As reported in paper, 30 the higher the loop, the higher the fluid flow rate.…”

Section: Resultssupporting

confidence: 52%

“…Paper 29 revealed that the NCL with vertical heater and cooler orientation was the most stable. The effect of vertical height on the NCL with vertical heater and vertical cooler has also been reported in paper 30 . Then, paper 31 proved experimentally that the placement of the expansion tank is crucial in single‐phase NCL.…”

Section: Introductionmentioning

confidence: 81%

“…The measurement uncertainty and the data acquisition rate were about ±0,13°C and ± 1 second, respectively. The work conducted in paper 30,34 showed that the fluid flow rate in the NCL was too slow to be measured by a flow meter. Therefore, we proposed a visual observation method that was carried out using a Fujifilm Finepix S2980 camera and lighting from the handphone camera flashlight 35 .…”

Section: Methodsmentioning

confidence: 99%

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Experimental and simulation approach of the loop geometry effect on the natural circulation system of the advanced nuclear reactor

2020

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Summary Lately, natural circulation has become an exciting topic because it has been proposed and applied in some advanced nuclear reactors as a passive safety system. The aim of the present study is to examine the effect of the loop geometry on the natural circulation based cooling system of a given power source. The experimental approach was achieved by the construction of two natural circulation loops with vertical heater and vertical cooler. Both circulation loops were built with a same vertical length of 100 cm and different horizontal lengths, each of 50 and 100 cm, respectively. The heater was realized with a stainless pipe wrapped by a Nichrome wire, whereas the cooling system was designed and built as a pipe in 30 cm long square tube. Thus, the cooling water will circulate around the pipe loop inside the rectangular cooling chamber. The temperature data acquisition was achieved via an Arduino‐based system, controlling four K‐type thermocouple sensors. The numerical simulation part in the present work, was carried out by the COMSOL Multiphysics software, using the dedicated heat transfer and fluid dynamic module, namely the computational fluid dynamic module. The experimental data were considered to parameterize the COMSOL input model. The experimental results showed a clear difference between two passive cooling loops according to the horizontal length. The doublings of the horizontal and vertical lengths of the loop have a direct effect on the fluid flow rate.

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Section: Resultssupporting

confidence: 52%

Section: Introductionmentioning

confidence: 81%

Section: Methodsmentioning

confidence: 99%

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Experimental and simulation approach of the loop geometry effect on the natural circulation system of the advanced nuclear reactor

2020

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“…Moreover, the PCM tank can be a part of the natural convection passive cooling system belonging to the reactor safety cooling system [12]. To increase the temperature difference between the reactor and the cooler, and therefore increase the efficiency of the natural convection, a PCM storage tank can be utilized as a cooler of the circulating fluid.…”

Section: Pcm Storage Tank Applicationmentioning

confidence: 99%

The thermal behaviour of a special heat exchanger filled with the phase change material dedicated for low – temperature storage applications

Ochman

Pietrowicz

2019

EPJ Web Conf.

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The work deals with an experimental and theoretical analysis of a special heat exchanger filled with the PCM (Phase Change Material) mixture of paraffin wax capsuled in the melamine-formaldehyde membrane and water, dedicated to low-temperature storage applications. In the first part of the article, the PCM topic was introduced. The next part consists information about the designed and manufactured special heat exchanger with the PCM. During the experiment as a PCM is utilized mixture of paraffin wax in microcapsules within the water. The experimental results of temperature distributions and stored energy in the heat exchanger were compared with the theoretical model proposed in the literature. In the discussion section, the authors describe a new idea of the PCM storage tank application, which could be applied e.g. in nuclear facilities.

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“…The instability of the natural circulation system has become an exciting topic, as reported in related papers. The effect of vertical height on the natural circulation loop (NCL) with vertical heater and horizontal cooler orientation has been reported in paper [8]. Then, the authors' work has been done on paper [9], demonstrated experimentally that expansion tank placement is crucial in single-phase NCLs.…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics analysis of the natural circulation system in vertical heater horizontal cooler (VHHC) molten salt loop

Hariyanto¹,

Waris²,

Suprijadi³

2022

J. Phys.: Conf. Ser.

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Molten salt has attracted the attention of researchers, especially as a coolant because of its characteristics. This study aimed to analyse the transient and steady-state of the natural circulation system in the molten salt loop with vertical heater and horizontal cooler using computational fluid dynamics. The computational fluid dynamics module in the COMSOL Multiphysics software was used to solve governing equations. Experimental data from several references were used as input data in modelling. The loop was modelled as a rectangular loop with Inconel 625 as the pipe material and molten salt (NaNO3+KNO3) as the working fluid. The variation of heater power was also carried out in modelling. The modelling results showed a good agreement with the experimental results. The results provided that the molten salt natural circulation loop with vertical heater and horizontal cooler showed good flow stability without reversal of flow direction.

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Study of Natural Convection Passive Cooling System for Nuclear Reactors

Cited by 12 publications

References 0 publications

Experimental and simulation approach of the loop geometry effect on the natural circulation system of the advanced nuclear reactor

Experimental and simulation approach of the loop geometry effect on the natural circulation system of the advanced nuclear reactor

The thermal behaviour of a special heat exchanger filled with the phase change material dedicated for low – temperature storage applications

Computational fluid dynamics analysis of the natural circulation system in vertical heater horizontal cooler (VHHC) molten salt loop

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