An experimental study on the heat transfer performance of a prototype molten-salt rod baffle heat exchanger for concentrated solar power

Qiu, Yu; Sun, Qiuye; Wang, Wenqi; Du, Bao-Cun; Wang, Kun

doi:10.1016/j.energy.2018.05.040

Cited by 51 publications

(7 citation statements)

References 47 publications

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“…For nuclear energy, molten fluoride salts are considered as promising heat transfer fluids in the state-of-the-art fourth-generation nuclear plant [11,12]. This is because the molten salts have numerous advantages such as low vapour tension, good thermostability, and low price [13,14].…”

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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“…For an isothermal Stirling engine model, the heat addition is assumed to occur at a constant temperature of charged gas T H . During the heating process as the hot oil temperature varies, the heat transferred in the heater can be calculated as Equation () 28,29 :

Q_{H} = K_{H} \frac{((), T_{2} - T_{H}) - ((), T_{3} - T_{H})}{italicLn ((), \frac{((), T_{2} - T_{H})}{((), T_{3} - T_{H})})}

where T H is the gas temperature at the hot end and K H heat transfer's ability of the heater heat exchanger which is calculated as:

K_{H} = h_{H} A_{s, H}

where A s , H is the heater surface area.…”

Section: Model Descriptions and Validationmentioning

confidence: 99%

A new solar atmospheric water harvesting integrated system using CPV/T – Stirling engine – Absorption cooling cycle and vapor compression refrigeration cycle

et al. 2021

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Summary This research theoretically investigates the performance of a new integrated solar atmospheric water harvesting system. The system consists of a concentrated photovoltaic thermal unit (CPV/T) to capture solar radiation and produce electricity. The rejected heat is utilized to drive an alpha‐type Stirling engine and a single effect LiBr/H2O absorption cooling cycle (ACC). The power output of the Stirling engine and the CPV/T is used to drive a vapor compression refrigeration cycle (VCRC), whereas the cooling capacity of the cooling cycles is used to cool and dehumidify ambient air and generate potable water. Moreover, a heat recovery heat exchanger is employed to pre‐cool the supply air before entering the evaporator, thus increasing the water production rate. The model is validated and solved numerically. A parametric study is conducted to show the effect of a variety of ambient and operating conditions on the system's performance. The highest water production rate is found, as expected, to be in hot and humid climates where the solar radiation, the ambient temperature, and the relative humidity are high. The freshwater production exhibits a non‐monotonic behavior with increasing the air mass flow rate, and the maximum potable water production was identified. At solar radiation values of 0.6, 0.8, and 1 (kW/m2), the maximum water production was generated at air mass flow rate values of 1.6, 2.8, and 3.8 (kg/s), and the corresponding maximum water production were 13.37, 20.12, and 26.28 (L/h), respectively. It is found that this integrated system can produce up to 30 L/h under hot and humid ambient conditions, and pre‐cooling of the supplied air yields better performance under drier conditions. The proposed system is suitable for small‐scale applications where water demand is less than 180 L/day. It is found that the amount of electrical energy consumed per liter of produced water by this system is between 225 and 315 Wh/L approximately.

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“…Qiu等人 [24] , 2019 鉴于此, 作者团队 [23] 在前期研究中搭建了大型熔盐换热实验台, 系统研究了熔盐在普通的管壳式换热器壳侧 [29] 、大小孔折流板换热器壳侧 [30] 、弓形折流板换热器壳侧 [31] 、折流杆换热器壳侧 [32] 以及印刷电路板换热器翼型肋片侧 [33]…”

Section: Hitecunclassified

“…基于所搭建的实验台, 作者团队系统研究了熔盐在普通的管壳式换热器壳侧 [29] 、大小孔折流板换热器壳侧 [30] 、弓形折流板换热器壳侧 [31] 、折流杆换热器壳侧 [32] 等4种管壳式换热器以及印刷电路板换热器翼形通道侧 [33] 内的换热规律. 下面将分别对上述换热结构进行简要介绍.…”

Section: 种具有复杂换热结构的典型换热器介绍unclassified

Convective heat transfer characteristics of molten salts flowing in complex flow structures: Experimental studies and progress

Wang¹,

Qiu²,

Zheng³

et al. 2019

Chin. Sci. Bull.

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An experimental study on the heat transfer performance of a prototype molten-salt rod baffle heat exchanger for concentrated solar power

Abstract: experimental study on the heat transfer performance of a prototype molten-salt rod baffle heat exchanger for concentrated solar power. Note: This is a preprint. The content of the manuscript may be revised in the final published version.

Cited by 51 publications

References 47 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 new solar atmospheric water harvesting integrated system using CPV/T – Stirling engine – Absorption cooling cycle and vapor compression refrigeration cycle

Convective heat transfer characteristics of molten salts flowing in complex flow structures: Experimental studies and progress

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