Effect of bypassing the heat transfer fluid on charging in a latent thermal energy storage unit

Date

2023-06-01

Author

Baghaei Oskouei, Seyedmohsen
Bayer, Özgür

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

184
views

0
downloads

Horizontal latent thermal energy storage (LTES) systems that use phase change materials (PCMs) are popular and effective methods of alleviating the intermittency of renewable energy sources. The main issue of PCMs is their low thermal conductivity, resulting in long charging times and slow response. In this investigation, a novel method to overcome this issue is proposed by designing bypassing tubes that redirect the flow of heat transfer fluid to the bottom of the horizontal LTES tank, where the melting rate is the slowest. A series of 3D numerical model are performed based on the enthalpy porosity method and validated using experimental data in the literature. Five bypassing tubes at the bottom of the tank are placed such that the reentry point is near the outlet, where the PCM temperatures are the lowest. Three parameters, the lengths, radial distance, and mass flow rate ratio of the bypassing tubes are studied and the effect of each by investigating the evolution of liquid fraction, PCM temperature, and heat transfer fluid outlet temperatures is studied. Additionally, the charging rate, charging efficiency, and the convective heat transfer coefficient are studied. It is established that the radial distance of the bypass tubes is the most effective parameter on charging time, while the mass flow rate ratio is the least important. With the largest value of radial distance and length, a reduction in total melting time of 67% is achieved. With an increase in bypassing mass flow rate, the charging efficiency of the LTES tank increases dramatically even though the melting time does not change significantly.

Subject Keywords

Energy storage, Melting, Natural convection, Phase change materials

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85148959494&origin=inward
https://hdl.handle.net/11511/102635

Journal

Journal of Energy Storage

DOI

https://doi.org/10.1016/j.est.2023.106959

Collections

Department of Mechanical Engineering, Article

Suggestions

OpenMETU
Core

CHARACTERIZATION OF LATENT THERMAL ENERGY IN A STORAGE UNIT WITH FIBONACCI-SEQUENCE-INSPIRED FINS Baghaei Oskouei, Seyedmohsen; Bayer, Özgür; Department of Mechanical Engineering (2023-1-19) Latent thermal energy storage (LTES) is a viable method to mitigate one of the main problems with renewable energy sources, such as solar energy, which is their intermittent nature. LTES units take advantage of the large latent heat of fusion in phase change materials (PCMs) to store a substantial amount of energy in a relatively small volume, making them efficient and economical. The major challenge with PCMs is their low thermal conductivity, eventuating long melting (charging) and solidification (dischar...
Enhancement of the Thermal Energy Storage Using Heat-Pipe-Assisted Phase Change Material Behi, Hamidreza; Behi, Mohammadreza; Ghanbarpour, Ali; Karimi, Danial; AZAD, ARYAN; Ghanbarpour, Morteza; Behnia, Masud (2021-10-01) Usage of phase change materials' (PCMs) latent heat has been investigated as a promising method for thermal energy storage applications. However, one of the most common disadvantages of using latent heat thermal energy storage (LHTES) is the low thermal conductivity of PCMs. This issue affects the rate of energy storage (charging/discharging) in PCMs. Many researchers have proposed different methods to cope with this problem in thermal energy storage. In this paper, a tubular heat pipe as a super heat condu...
Effect of Synthetic Fibers on Energy Absorption Capacity of Normal and High Performance Concrete Şengün, Emin; Alam, Burhan; Yaman, İsmail Özgür (null; 2016-06-08) With the increasing aim of incorporating concrete in different applications and infrastructure elements, the use of macro synthetic fiber incorporated concretes has become real popular thanks to their high energy absorption capacity, toughness and impact resistance. The aim of this study is to investigate the effects of synthetic fibers on toughness and energy absorption of normal and high performance concretes. For this experimental study, eight concrete groups were designed using synthetic fibers of vario...
Experimental analysis of energy storage device using phase change material integrated with a milk storage system Nıma, Bonyadı; Somek, Suleyman Kazım; C Cıhan, Ozalevlı; Baker, Derek Keıth; Tarı, İlker (null; 2015-08-12) Phase change materials (PCMs) have the advantage of storing latent heat at constant temperature and can possess higher energy storage densities in comparison to materials storing sensible heat. Due to these features, latent heat Thermal Energy Storage (TES) devices using PCMs are widely used to store heat in thermal systems. The aim of this study is to experimentally investigate the performance of water PCM in an improved milk storage cooling cycle integrated with a TES device. In this prototype, water is u...
Effect of Submerged Arc Welding on High Temperature Tensile Properties of P91 Type Steel Aslam, Junaıd; Batıgün, Caner; Gür, Cemil Hakan (2021-9-01) There have been research efforts to increase the efficiency of power plants by improving creep-resistant steels having stable mechanical properties at elevated temperatures. The components operating at temperatures between 575°C and 650°C are usually made of P91 (9Cr-1Mo) steel. The application of welding techniques creates a risk of reduction in high-temperature strength and creep resistance, particularly in the heat-affected zone of the weldments. In this study, the effect of the shielded metal ar...

Citation Formats

S. Baghaei Oskouei and Ö. Bayer, “Effect of bypassing the heat transfer fluid on charging in a latent thermal energy storage unit,” Journal of Energy Storage, vol. 62, pp. 0–0, 2023, Accessed: 00, 2023. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85148959494&origin=inward.