Thermal Performance Analysis of PCM Capsules Packed-Bed System with Biomimetic Leaf Hierarchical Porous Structure

As an efficient natural selection nutrient transport system, biomimetic leaf hierarchical porous structure has unique advantages in material transportation and energy transfer. Biomimetic leaf hierarchical porous structure has been widely used in solar thermochemical reactions, photocatalysis, and e...

Full description

Saved in:
Bibliographic Details
Published in:Journal of thermal science 2021, Vol.30 (5), p.1559-1571
Main Authors: Dong, Yan, Wang, Fuqiang, Yang, Luwei, Shi, Xuhang, Zhang, Guoliang, Shuai, Yong
Format: Article
Language:English
Subjects:
Biomimetic materials
Bionics
Classical and Continuum Physics
Diameters
Energy storage
Energy transfer
Engineering Fluid Dynamics
Engineering Thermodynamics
Heat and Mass Transfer
Latent heat
Melting points
Physics
Physics and Astronomy
Power consumption
Pressure drop
Storage capacity
Structural hierarchy
Temperature distribution
Thermal energy
Thermal response
Thermal storage
Thermodynamic efficiency
Transportation systems
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:As an efficient natural selection nutrient transport system, biomimetic leaf hierarchical porous structure has unique advantages in material transportation and energy transfer. Biomimetic leaf hierarchical porous structure has been widely used in solar thermochemical reactions, photocatalysis, and energy storage. To improve the thermal efficiency and reduce the power consumption, the authors introduce the idea of bionic leaf hierarchical porous structure packed-bed latent heat thermal energy storage (LHTES) system. Under the same porosity, the diameter of the PCM capsules is designed to change along the flow direction to optimize the thermal performance. The effects of velocity on temperature distribution, pressure drop, liquid fraction, and thermal storage capacity of the conventional uniform model and bionic leaf hierarchical porous model are analyzed. The results show that the bionic leaf hierarchical porous structure can thin the thickness of the thermocline, reduce the pressure drop, increase the heat transfer area, and improve the thermal response of the packed-bed compared with the conventional uniform model. The maximum increases of liquid fraction and completion rate are 36.6% and 20.3% with pressure drop reduction of 25 Pa, respectively. The maximum decrease of the above-melting point (MP) thermocline is 51.7% as well. These results provide suggestions to optimize the packed-bed LHTES system and improve its thermal performance under practical conditions.
ISSN:1003-2169
1993-033X
DOI:10.1007/s11630-021-1462-z