Comparative research of heat discharging characteristic of single tank molten salt thermal energy storage system

Zhang, Cancan; Lu, Yuanwei; Shi, Suli; Wu, Yuting

doi:10.1016/j.ijthermalsci.2020.106704

Cited by 18 publications

(7 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5 Recently, a modern technique for the recovery of waste heat energy released into the atmosphere for various reasons is storing the waste heat in a thermal energy storage (TES) system for later use in various applications. 6,7 TES systems differ in energy storage density, and operational characteristics during charging and discharging. 8 Heat energy may be stored by different methods, such as sensible heat storage, thermochemical heat storage, 9,10 and latent heat storage.…”

Section: Introductionmentioning

confidence: 99%

An investigation of the melting process in a latent heat thermal energy storage system using exhaust gases of a spark ignition engine

Gürbüz

Ateş

2022

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

This article presents numerical and experimental results on the melting process of phase change material (PCM) in a latent heat storage (LHTES) system designed to recover the exhaust waste heat energy of a SI engine. In the LHTES system as PCM, three different paraffin waxes, commercially identified by the codes RT27, RT35, and RT55, were used. A closed-loop liquid circulation system with two heat exchangers was designed with one connected to the exhaust line of the SI engine and the other used in the melting of the PCMs. Water was used as the heat carrier fluid to melt the PCMs with hot exhaust gases. In addition, an experimental study was conducted on a single-cylinder, air-cooled SI engine fueled by gasoline with a stroke volume of 476.5 cm3, using RT55 in the designed LHTES system. By comparing the experimental results with the analysis results, the validity of the numerical model is ensured. According to the experimental temperature results in the center of the PCM container, the error of the numerical results is approximately 7.8%, while there is a difference of 0.4 units and 2.1% in terms of PCM heat exchanger efficiency and total heat energy stored, respectively. At the end of the analyses (1440th second), performed under the same boundary conditions in the LHTES system design, the storing heat energy is as follows: 1829 kJ by 88.8% liquid fraction for RT27, 1556 kJ by 86% liquid fraction for RT35, and 1843 kJ by 83.9% liquid fraction for RT55. In addition, the PCM heat exchanger efficiency for RT27, RT35, and RT55 is 11%, 9.4%, and 11.1%, respectively.

show abstract

Section: Introductionmentioning

confidence: 99%

An investigation of the melting process in a latent heat thermal energy storage system using exhaust gases of a spark ignition engine

Gürbüz

Ateş

2022

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…The heat discharge period reduces as the inlet velocity increases, but the heat discharge power increases as the inlet velocity increases. The heat discharge power under automatic and manual adjustment of inlet speed varies by ±3% and ±10% from the set value, respectively [14]. A numerical model was built using enthalpy porosity model and two-temperature energy equations to evaluate thermal energy storage, extract the latent thermal energy from a storage system, and understand detailed heat transfer properties during a phase change material.…”

Section: Of 23mentioning

confidence: 99%

Dynamic Process Simulation of a Molten-Salt Energy Storage System

et al. 2021

View full text Add to dashboard Cite

The main objective of this work was the construction of a numerical model using Advanced Process Simulation Software to represent the dynamic behaviour of a thermal storage system (TSS). The storage model was validated by comparing the results with the measured data of the storage process of the Andasol 2 solar power plant. Subsequently, a system analysis and system optimisation were carried out, and the stand-alone concept of the thermal storage system is presented. Stand-alone refers to an isolated use of the storage system without a solar power plant. During power peaks, this storage medium is heated with excess electrical power and later returned to the electrical grid through a steam cycle. Then, the system was optimised by modelling four models based on the type of storage medium and the temperature difference of the storage system. The four models, Andasol 2, SSalt max, Hitec, and Carbonate, were evaluated and compared in terms of the improvement in capacity and efficiency that can be achieved. The comparison shows that the preferred storage medium is carbonate salt due to the increases in both efficiency and capacity. The greatest increase in efficiency in terms of power generation can also be achieved with the Carbonate model (18.2%), whereas the amount of increase was 9.5% and 7.4% for each of SSalt max and Hitec, respectively. The goal of this analysis and system optimisation of a thermal salt storage system is to stabilise and relieve the local power grid.

show abstract

“…In a similar work, Shademan et al 16 investigated the effects of geometric parameters of rectangular fins on the charging time and the stored energy, assuming laminar HTF flow with coupled boundary conditions. Zhang et al 1,17 using air as HTF, monitored inflow and outflow temperatures as isothermal boundary conditions for PCM heat transfer in a numerical and experimental study. Ju et al 18 developed a two-dimensional thermal model to analyze the heat charging characteristics of a PCM system operated by steam condensation.…”

Section: Introductionmentioning

confidence: 99%

“…Energy applications globally are increasingly prioritizing the reduction of carbon emissions, particularly in light of the substantial waste generated by renewable energy sources such as solar and wind power. 1 To address this challenge, the exploration of thermal energy storage (TES) systems has gained prominence, offering the capacity to store intermittent energy sources and ensure a consistent energy supply. TES achieves this objective by harnessing either latent heat or sensible heat.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of flow boiling behavior in a vertical tube of a shell‐and‐tube phase change heat storage unit

Zheng,

Yu,

Xie

et al. 2024

Energy Storage

View full text Add to dashboard Cite

Phase Change Materials (PCMs) demonstrate significant potential as latent heat storage systems for direct steam generation. This investigation explores the heat transfer dynamics of an upward‐flowing heat transfer fluid (HTF) boiling within a vertical tube, concurrently examining the solidification process of PCM outside the tube. A two‐dimensional model of a shell and tube heat storage device is established for this purpose. The simulation employs the Volume of Fluid (VOF) model coupled with the Lee model to simulate HTF boiling inside the tube. Concurrently, the enthalpy‐porosity model is utilized to analyze the PCM solidification process. The findings reveal that PCM solidification and heat discharge are influenced by the temperature and thermal conductivity of the HTF, leading to uneven solidified PCM thickness along the tube's length over time. Additionally, variations in tube length, inlet velocity, and inlet temperature impact both the vapor quality of HTF and the thickness of solidified PCM. Tube length correlates with boiling time, affecting the accumulation of steam quality throughout the coupling process. Inlet velocity dictates the heat transfer of HTF with PCM within a limited distance, and insufficient heat exchange resulting in the cessation of HTF boiling. Inlet temperature determines the appropriate device size, lower inlet temperatures necessitate longer tubes to extend the heat charging duration until boiling initiation.

show abstract

Comparative research of heat discharging characteristic of single tank molten salt thermal energy storage system

Cited by 18 publications

References 33 publications

An investigation of the melting process in a latent heat thermal energy storage system using exhaust gases of a spark ignition engine

An investigation of the melting process in a latent heat thermal energy storage system using exhaust gases of a spark ignition engine

Dynamic Process Simulation of a Molten-Salt Energy Storage System

Numerical investigation of flow boiling behavior in a vertical tube of a shell‐and‐tube phase change heat storage unit

Contact Info

Product

Resources

About