Nonuniform Heat Transfer Model and Performance of Molten Salt Cavity Receiver

Lu, Jianfeng; Wang, Yarong; Ding, Jing

doi:10.3390/en13041001

Cited by 2 publications

(2 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Even though the Nusselt number was lower for sodium liquid by about 1760 % compared with molten salt and 1420 % lower compared with Hitec (as shown in Figure 30 ), this is due to the higher thermal conductivity and the lower wall temperature of liquid sodium. However, the radiation heat loss was lower due to a low wall temperature, and the thermal efficiency is higher [ 43 ]. As a result, the maximum operating temperatures were 724 K, 694 K, 684 K for liquid sodium, Hitec, and molten salt, respectively, as shown in Figure 31 .…”

Section: Resultsmentioning

confidence: 99%

An optimisation study of a solar tower receiver: the influence of geometry and material, heat flux, and heat transfer fluid on thermal and mechanical performance

Shatnawi

Lim

Ismail

et al. 2021

Heliyon

View full text Add to dashboard Cite

The solar receiver is considered the cornerstone of the solar tower power system. In particular, it receives hightemperature heat flux rays, and extracts the maximum heat energy to be transferred to the heat transfer fluid, while minimising any thermal and mechanical stresses. Reducing the solar receiver size helps to reduce the loss of spillage; consequently, the thermal stress increases. Using a solar receiver with inserted triangular longitudinal fins enhances the heat transfer as well as strengthens the receiver tube. This study aims to optimise the number of fins, heat flux aiming point, heat transfer fluid, nanoparticle effect with molten salt as the base fluid, and type of receiver material. Non-uniform heat flux with the cosine and Gaussian effects have been considered. When the number of fins (N) increases, the maximum temperature (T max ) decreases and the heat transfer is enhanced. When N ¼ 20, T max ¼ 656.4 K and when N ¼ 1, T max ¼ 683.55, while the efficiency for N ¼ 1 is greater by 3% compared to when N ¼ 20. The cosine distribution of heat flux has a higher maximum temperature than the Gaussian distribution by 29% and is 102% higher in receiver efficiency. The thermal efficiency when the heat flux is aimed at the middle point of the receiver is higher by 10% compared with a lower or upper aiming point. Using Al 2 O 3 nanoparticles with a concentration of 0.5 wt.% increases the thermal efficiency by 14% more than when using pure molten salt when Re ¼ 38000. Using liquid sodium is not required to monitor the peak heat flux, and by adding triangular fins the displacement and thermal stress are 6.5 % lower compared to a smooth receiver.

show abstract

Section: Resultsmentioning

confidence: 99%

An optimisation study of a solar tower receiver: the influence of geometry and material, heat flux, and heat transfer fluid on thermal and mechanical performance

Shatnawi

Lim

Ismail

et al. 2021

Heliyon

View full text Add to dashboard Cite

show abstract

“…The increasing population and challenge of environment crisis compel the development of large-scale renewable resources and clean energy technologies. To explore feasible solutions, numerous researchers have paid much attention to solar energy, especially concentrating solar power (CSP) with thermal energy storage (TES) [1]. Due to the advantages of excellent thermal properties and ideal economy, molten salts are generally utilized as heat transfer and thermal storage media.…”

Section: Introductionmentioning

confidence: 99%

Effects of MgO Nanoparticles on Thermo-Physical Properties of LiNO3-NaNO3-KNO3 for Thermal Energy Storage

Zhang

Wang

et al. 2021

Energies

Self Cite

View full text Add to dashboard Cite

Molten salt LiNO3-NaNO3-KNO3 has been investigated as heat transfer and thermal storage media for its low melting point and good thermal performance. In this paper, nanofluids were synthesized by dispersing MgO nanoparticles into LiNO3-NaNO3-KNO3, and the effects of nanoparticles on thermal properties were studied with different sizes (20–100 nm) and mass percent concentrations (0.5–2.0 wt.%). The addition of nanoparticles had little effect on melting temperature, and led to a slight increase in enthalpy of fusion by 2.0–5.5%. Compared with base salt, the density of nanofluid increased a little by 0.22–1.15%. The scanning electron microscope (SEM) test implied that nubby and punctate microstructures were responsible for larger surface area and interfacial energy, which could lead to the improvement of specific heat capacity reaching 2.6–10.6%. The heat transfer characteristics remarkably increased with the addition of nanoparticles, and the enhancement of average thermal diffusivity and conductivity of salt with 1 wt.% nano-MgO could be 5.3–11.7% and 11.3–21.2%, respectively. Besides, the viscosities of nanofluids slightly increased for 3.3–8.1%. As a conclusion, nano-MgO was positively influential on the thermal properties of LiNO3-NaNO3-KNO3 base salt.

show abstract

Nonuniform Heat Transfer Model and Performance of Molten Salt Cavity Receiver

Cited by 2 publications

References 39 publications

An optimisation study of a solar tower receiver: the influence of geometry and material, heat flux, and heat transfer fluid on thermal and mechanical performance

An optimisation study of a solar tower receiver: the influence of geometry and material, heat flux, and heat transfer fluid on thermal and mechanical performance

Effects of MgO Nanoparticles on Thermo-Physical Properties of LiNO3-NaNO3-KNO3 for Thermal Energy Storage

Contact Info

Product

Resources

About