Convective heat transfer characteristics in the turbulent region of molten salt in concentric tube

Chen, Y.S.; Wang, Y.; Zhang, J.H.; Yuan, Xiaoyan; Tian, Jian; Tang, Zhongfeng; Zhu, Huibin; Fang, Yuan; Wang, N.X.

doi:10.1016/j.applthermaleng.2015.12.023

Cited by 28 publications

(8 citation statements)

References 20 publications

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“…This is mainly due to the fast developments of CSP and nuclear technologies, where reliable heat transfer data and correlations with high accuracies are highly desired for the designs of heat transfer devices. From 2009 to now, the heat transfer performance of two liquid salts has been investigated by testing some shell-and-tube heat exchangers(STHX) when the salt flows in the tubes, where Hitec [13,[22][23][24][25][26] and LiNO3 [22,27,28] were employed.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study on heat transfer and flow features of representative molten salts for energy applications in turbulent tube flow

Qiu

Sun

et al. 2019

International Journal of Heat and Mass Transfer

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This article investigated the heat transfer performance and flow friction of the molten salts in turbulent tube flow, where four salts including Hitec, Solar Salt, NaF-NaBF4, and FLiNaK were studied. A computational model was developed to analyze the flow and heat transfer features of the salts in the tube, and experiments were conducted to test the heat transfer performance of a representative salt Hitec in the tubes of a salt-oil heat exchanger. Comparison of simulation results with the experimental data shows that the average errors are smaller than ±4%, which validates the simulation model. Based on the model, firstly the influences of heat flux uniformity at the tube outer wall were examined. The results show that the non-uniform wall flux can lead to local high-temperature region but influences little on the flow friction coefficient and the heat transfer performance. Then, the model was utilized to investigate the friction and heat transfer features of the salts under broad ranges of the temperature and the velocity. Comparisons of the simulated heat transfer results with Hansen's, Sider-Tate's and Gnielinski's correlations show that the largest errors can reach +25%, +13% and-15%, respectively. Furthermore, the errors between the simulated friction coefficients and the Filonenko's correlation are smaller than ±2%, which indicates that this correlation is suitable for predicting the friction of the salts. Finally, to predict the heat transfer performance more accurately for these representative salts, a new correlation was developed. It was found that the errors between all simulation results and the proposed correlation are smaller than ±5%, while the corresponding values for 80% experiment data of three salts are also lower than ±5%. The current study can offer beneficial results and correlation for the applications of liquid salts in energy systems.

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Section: Introductionmentioning

confidence: 99%

Numerical and experimental study on heat transfer and flow features of representative molten salts for energy applications in turbulent tube flow

Qiu

Sun

et al. 2019

International Journal of Heat and Mass Transfer

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“…Benoit et al (2015) measured heat transfer coefficients between the internal surface of the tube and the particles in the range 600-800 W/(m 2 K), whereas with molten salts flowing with a velocity of 1.8 m/s inside tubes with an internal diameter of 4 cm (similar to the one used by Benoit et al (2015) with particles) the heat transfer coefficient is around 6 kW/(m 2 K) (Rodríguez-Sánchez et al, 2014). Chen et al (2016), also using molten salts, measured heat transfer coefficients between 3 and 8 kW/(m 2 K) with fluid velocities between 1 and 5 m/s in a 2 cm i.d. tube.…”

Section: Discussionmentioning

confidence: 99%

A review of solar thermal energy storage in beds of particles: Packed and fluidized beds

Almendros-Ibáñez

Fernández-Torrijos

Díaz-Heras³

et al. 2019

Solar Energy

128

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“…In the pilot plant facility examined experimentally the molten salts temperature distribution and heat losses. The findings revealed that there was no temperature categorization in the storage tank, and that the radial heat transfer was primarily caused by the insulating material, the type of electrical resistance used for molten salts temperature regulation, the perspective of the storage tanks, and the operating conditions [13][14][15]. The objective of this present paper is to analysing the degradation of the materials of heat exchanger in thermal storage energy systems in the charging and discharging process using molten salt.…”

Section: Introductionmentioning

confidence: 97%

Evaluation methodologies of damage related issues for heat exchangers in the thermal storage energy system

et al. 2022

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Thermal oil is used as a heat transfer fluid in many thermal solar power systems, while molten salts are used to store thermal energy. The oil absorbs solar energy and transports it to a water-steam cycle via heat exchangers, where it is transformed into electric energy via a turbo-generator or stored in a thermal energy storage device for subsequent transmission to the water-steam cycle. The complexity of these thermal solar plants is rather significant, as they mix conventional engineering used in power stations (water-steam cycle) or petrochemical (oil pipeline) with modern solar (parabolic trough collector) and heat storage (molten salts) technology. This paper focuses on modelling in heat exchanger tubes in molten salt energy storage systems, and it offers a comprehensive model of the process. By developing such a model, the groundwork for future study into heat exchangers model failure analysis is established.

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Convective heat transfer characteristics in the turbulent region of molten salt in concentric tube

Cited by 28 publications

References 20 publications

Numerical and experimental study on heat transfer and flow features of representative molten salts for energy applications in turbulent tube flow

Numerical and experimental study on heat transfer and flow features of representative molten salts for energy applications in turbulent tube flow

A review of solar thermal energy storage in beds of particles: Packed and fluidized beds

Evaluation methodologies of damage related issues for heat exchangers in the thermal storage energy system

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