scholarly journals Numerical analysis of the solidification process of water used as PCM in a rectangular latent heat thermal storage unit

2021 ◽  
Vol 2116 (1) ◽  
pp. 012044
Author(s):  
M A Dekhil ◽  
J V Simo Tala ◽  
O Bulliard-Sauret ◽  
D Bougeard
Keyword(s):  
Heat Transfer ◽  
Numerical Analysis ◽  
Latent Heat ◽  
Temporal Evolution ◽  
Solidification Process ◽  
Thermal Storage ◽  
Storage Unit ◽  
Average Temperature ◽  
Flow And Heat Transfer ◽  
Change Material

Abstract A numerical analysis of the solidification process of water used as phase change material (PCM) has been carried out in a rectangular latent heat thermal storage unit. The major heat transfer phenomena involved in such a process were numerically characterized using the CFD code Star CCM+. During the solidification process, the flow and heat transfer were analysed through vector field, temperature and solid fractions contours. Quantitative global results such as the temporal evolution of the average temperature of the PCM were also provided during the solidification process. The present study shows that the natural convection plays an important role in heat transfer kinetics during solidification process.

Latent Thermal Storage Unit Using Form-Stable High Density Polyethylene; Part II: Numerical Analysis of Heat Transfer

1986 ◽  
Vol 108 (4) ◽  
pp. 290-297 ◽  
Author(s):  
M. Kamimoto ◽  
Y. Abe ◽  
K. Kanari ◽  
Y. Takahashi ◽  
T. Tani ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Computer Simulation ◽  
Numerical Analysis ◽  
High Density Polyethylene ◽  
Thermal Storage ◽  
High Density ◽  
Storage Unit ◽  
Discharge Characteristics ◽  
One Dimensional ◽  
Finite Difference Equations

Heat transfer in the latent thermal storage unit using form-stable high density polyethylene rods has been numerically analyzed. The analysis is based on simple explicit one-dimensional finite difference equations. The calculation can well simulate both the charge and discharge characteristics of the prototype storage unit developed by the present authors. The computer simulation has been used also to speculate the performance of the storage unit under various conditions. Effects of several parameters on the discharge characteristics have been quantitatively made clear.

Simulation Investigation for Heat Transfer in Fin-Tube Thermal Storage Unit with Phase Change Material

2010 ◽  
Vol 168-170 ◽  
pp. 895-899 ◽  
Author(s):  
Jian You Long
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Storage ◽  
Heat Transfer Fluid ◽  
Outlet Temperature ◽  
Water Heater ◽  
Storage Unit ◽  
Fin Tube ◽  
Change Material

This paper addresses a simulation investigation of a fin-tube thermal storage unit involving phase change process dominated by heat conduction. The heat transfer of fin-tube thermal storage unit with phase change material (PCM) was simulated by Fluent. Graphical results including outlet temperature of heat transfer fluid (HTF), average temperature of PCM and phase front interface of solid and liquid phase of PCM versus time and fin distance were presented and discussed. According to simulation results, it was concluded that only the fin-tube thermal storage unit with fin distance of 12fin/inch could satisfied the request of heat release performance of household heat pump water heater for shower.

scholarly journals Impact of Surface Undulation on Flow and Heat Transfer Characteristics in an Enclosure Filled with Nanoencapsulated Phase Change Materials (NEPCMs)

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
A. Alhashash ◽  
H. Saleh
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Latent Heat ◽  
Phase Change Materials ◽  
Volume Fraction ◽  
The Core ◽  
Flow And Heat Transfer ◽  
Parametric Studies ◽  
Hybrid Nanofluids ◽  
Change Material

The present study investigates the natural convection in a wavy enclosure caused by a thermal difference between a cold wall and a hot undulated wall. The enclosure is filled with hybrid nanofluids. The hybrid nanofluids are formed of a phase change material (PCM) suspended in the water. The PCM utilizes polyurethane as the shell and nonadecane as the core. The core absorbs or releases its energy in the shape of latent heat inside the water and contributes to thermal energy storage and heat transfer. The governing equations are expressed in PDEs and solved by the finite element method (FEM). Parametric studies were used to analyze the solid concentration, fusion temperature, amplitude of corrugation, number of corrugations, and Rayleigh number. It is found that the heat transfer rate enhances by the rise of the latent heat of the NEPCM cores. The global heat transfer can be improved by more than 12 % by adding 1 % of NEPCM particles volume fraction. However, the heat transfer tends to decrease by applying the wavy surface.

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