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PCM (Phase Change Material) in a Finned Tube CFD Simulation

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Phase Change Materials (PCM) are materials with organic compounds that can absorb and store a large amount of latent heat energy.

This product includes a CFD simulation and training files using ANSYS Fluent software.

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Description

PCM

Thermal energy storage in PCM is obtained during the phase change process, so that during the phase change from solid to liquid, it absorbs heat from the environment and during liquid-to-solid phase change, returns heat to the environment. PCMs have a variety of melting (Liquidus) or freezing (solidus) temperatures and therefore used in cooling and heating systems; These materials receive solar energy in the form of latent heat and melt in warm days, and then return the heat to the environment again in the cool night, by changing the phase and solidification and melting process.

Problem Description for PCM simulation

The present issue deals with the simulation of PCM. PCMs are embedded in a three-layer tube heat exchanger as a latent heat storage tank; The inner tube body and its fins are made of copper which has good Thermal Conductivity and the fluid in the inner tube is liquid silicone type and also the PCM is Erythritol. Since the nature of the PCMs of the present model is based on the phase change between the two solid and liquid phases, a Solidification and Melting module is used for CFD simulation. The simulation process is performed over 12,000 seconds. The purpose of the present study is to investigate the fluid and thermal behavior of the phase change materials and the fluid mass fraction in the solid-liquid mixture, based on the dimensions and physical conditions of the tube fins as well as the properties of the internal fluid.

Assumption for PCM CFD Simulation

There are several assumptions that used for the present simulation:

The solver is Pressure-Based.

The simulation is Transient (Unsteady).

Gravity Force is ignored.

Geometry and Mesh

The 3-D geometry of the model was designed by Design Modeler software. The present model is consist of an outer tube with a concentric inner tube with a lower radius and eight welded fins on the body. The liquid flows through the inner tube and the inner tube and its fins thickness is considered as the Wall, with the PCM in the space between the two tubes. Due to the symmetrical geometric structure of the model, it is possible to simulate a 3-D segment with a cross-sectional area as much as one eighth of the original 3-D model.

To mesh the present model, we have used ANSYS Meshing software and Hybrid (structured and unstructured) mesh. The element number is 107718.

CFD Simulation Set-Up

Here is the summaries of the problem definition and problem solving steps in the table:

Models for PCM CFD Simulation
k-epsilon Viscous model
Standard k-epsilon model
Standard wall function Near wall tratment
Solidification/Melting model Solidification & Melting
100000 Mushy zone parameter
on energy
Boundry conditions for PCM CFD Simulation
Velocity inlet Inlet type
1 m.s-1 velocity magnitude – silicone
343.15 K temperature – silicone
Pressure outlet Outlet type
0 Pa gauge pressure
wall Walls type
heat flux = 0 outer walls
coupled inner walls
Solution Methods for PCM CFD Simulation
Simple   Pressure-velocity coupling
Second order upwind pressure Spatial discretization
Second order upwind momentum
Second order upwind energy
First order upwind turbulent kinetic energy
First order upwind turbulent dissipation rate
Initialization for PCM CFD Simulation
Standard Initialization method
387 K Initial temperature

 

All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.

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