Thermal modeling of packed bed, thermal energy storage systems has traditionally been limited to first-law considerations. The exceptions include a few second-law studies, noted in the Introduction, of sensible heat storage systems and the latent heat storage systems. The cited second-law studies treat the storage and removal processes …
Packed bed energy storage is a mature and widespread thermal energy storage technology, generally employing and pebbles/rocks [9,10] and phase change materials [11, 12] as the heat storage materials.
The applicability of packed bed latent thermal energy storage devices is restricted by the limited thermal conductivity of phase change materials (PCMs). As a cheap and simple heat transfer-enhanced construction, the hollow channel allows the heat transfer fluid to go through the capsule center directly where the melting rate of PCM would be …
The packed bed tank with multiple phase change materials (PCMs) is one of the most efficient latent heat energy storage techniques. This study presents insight into the influence of the latent heat arrangements on the cascaded packed bed tank, providing a new idea for designing multi-PCM packed bed tank, which concerns the screening of PCMs.
A mathematical model of the charging process for a structured packed-bed latent thermal energy storage unit with phase change material capsules is established. The thermal-hydrodynamic characteristics of the unit are investigated. The impacts of the heat transfer fluid inlet velocity, heat transfer fluid inlet temperature, initial temperature of …
Stacked ensemble learning-based framework for phase change prediction. • Sensitivity analysis is introduced for key feature selection. • Prediction accuracy is enhanced with a minimum 3.06% of MAE for charging process. • It …
Thermal energy storage system in the form of packed bed with encapsulated phase change materials (EPCMs) can improve the thermal performance of the traditional latent heat storage system. According to Li et al. [ 10 ], the charging and discharging efficiency of a packed bed thermal energy storage system (PBTES) is …
Phase change material (PCM)-based thermal energy storage (TES) has attained significant attraction towards energy savings and ensures a continuous energy supply. However, the lower thermal conductivity of PCM impedes the efficient transfer in the storage systems, thereby causing longer charging time.
An experimental setup is developed to assess the heat transfer performance of the packed bed latent heat thermal energy storage filled with cylindrical capsules containing PCM at a temperature range of 200–350 C. Fig. 1 shows the schematic diagram of the open flow loop and in-house developed experimental setup of a packed …
These systems were the packed bed (PBTES) and phase change material (PCM) thermal energy storage systems, respectively. Pebble stones were utilized as energy storage material in PBTES, while paraffin wax with a melting temperature of 55–60 °C was used in PCM.
In the present study, a two-dimensional CFD approach has been chosen to investigate heat transfer in a packed bed filled with phase change materials (PCM) capsules. In this research, four different geometries, circular, hexagonal, elliptical, and square, are considered PCM packages made of KNO3 covered with a copper layer and …
The Cool Thermal Energy Storage (CTES) system proves to be a viable solution for energy storage by utilizing Phase Change Materials (PCM) during off-peak times. This stored energy can then be effectively utilized to …
The current paper investigates the radial gradient arrangement of phase change material capsules effect on the thermal behavior of a packed-bed latent thermal energy storage system. A transient two-dimensional dispersion-concentric model is developed to analyze the phase transition of phase change materials.
The eight-fin storage system increases the daily charging capacity, thermal energy storage, thermal energy storage rate, and average effectiveness during melting by 146.0%, 133.8%, 123.5%, and 109.0%, …
Thermal energy storage is an important subsystem of a solar thermal power station. Compared with the two-tank storage system, the packed bed storage system uses a single tank to store thermal energy temporarily and release it when the energy is needed. The ...
Heat transfer enhancement and optimization are found to be essential for the PCM (phase change material) thermal energy storage design. In this work, the performance advantage of the packed bed PCM storage unit design is analyzed in comparison, and the impacts of key geometric parameters of a packed bed unit were numerically investigated.
Phase change materials (PCMs) have garnered significant attention as a prospective solution for photothermal energy storage, attributed to their notable energy density. Nonetheless, the constrained thermal conductivity of PCMs leads to delayed heat storage from the photothermal conversion surface, causing a build-up of heat at the …
Thermal performance of pure silicon as Phase Change Material (PCM) has been numerically investigated in a packed bed latent heat thermal energy storage. Hot air was selected as the Heat Transfer ...