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.

Latent Thermal Storage Unit Using Form-Stable High Density Polyethylene; Part I: Performance of the Storage Unit

1986 ◽  
Vol 108 (4) ◽  
pp. 282-289 ◽  
Author(s):  
M. Kamimoto ◽  
Y. Abe ◽  
S. Sawata ◽  
T. Tani ◽  
T. Ozawa
Keyword(s):  
Heat Transfer ◽  
High Density Polyethylene ◽  
Direct Contact ◽  
Thermal Storage ◽  
High Density ◽  
Heat Transfer Fluid ◽  
Contact Heat ◽  
Storage Unit ◽  
Contact Heat Transfer ◽  
Solar Thermal Applications

A latent thermal storage unit of 30 kWh using form-stable high density polyethylene (HDPE) rods has been developed mainly for solar thermal applications, and heat transfer experiments have been carried out. A direct contact heat transfer technique between HDPE rods and ethylene glycol (EG: a heat transfer fluid) is adopted. Charge and discharge characteristics have been obtained for various thermal input/output and different initial temperature profiles in the storage unit. The direct contact heat transfer and a formation of a clear thermocline provide a good performance for all the cases. Discussions are given of thermal efficiency, storage density, and thermal insulation.

Charge and Discharge Characteristics of a Direct Contact Latent Thermal Energy Storage Unit Using Form-Stable High-Density Polyethylene

1984 ◽  
Vol 106 (4) ◽  
pp. 465-474 ◽  
Author(s):  
Y. Abe ◽  
Y. Takahashi ◽  
R. Sakamoto ◽  
K. Kanari ◽  
M. Kamimoto ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
High Density Polyethylene ◽  
Direct Contact ◽  
High Density ◽  
Storage Unit ◽  
Discharge Characteristics ◽  
Energy Storage Unit

For solar thermal energy utilization in relatively low temperatures, a lab-scale direct contact, latent thermal energy storage unit using a form-stable high-density polyethylene (HDPE) was developed. The phase change material (PCM), the form-stable HDPE, does not fluidize nor adhere even after melting, and this particular property permits a direct contact heat transfer between the PCM and a heat transfer fluid (HTF). The storage column in the present study consists of a bundle of vertically arranged thin HDPE rods, where HTF flows in the axial direction and contacts with the HDPE surface directly. A series of experiments were performed for both charge and discharge modes under conditions of different flow rates, initial temperatures in the column, and HTF inlet temperatures. A numerical simulation was also made to study further detailed performance of the storage unit. The charge and discharge characteristics of the storage unit are discussed.

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.

The Heat Charge and Discharge Characteristics Simulation of Phase Change Thermal Storage Device

2011 ◽  
Vol 179-180 ◽  
pp. 239-242
Author(s):  
Hai Chuan Tian ◽  
Feng Xu ◽  
Guo Li Yang ◽  
Teng Fei Wu
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Heat Storage ◽  
Thermal Storage ◽  
Storage Device ◽  
Transfer Model ◽  
Two Dimensional ◽  
Unsteady Heat Transfer ◽  
Discharge Characteristics ◽  
Release Property

The two-dimensional unsteady heat transfer model is been established. Analyzing on heat storage-release property of phase change thermal storage device within the fluid parallel spiral pipes in various conditions, suggestions are put forward to strengthen thermal storage for the device.

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