Heat and Mass Transfer

, 47:1027

Shell-and-tube type latent heat thermal energy storage: numerical analysis and comparison with experiments

Authors

    • Lehrstuhl für Technische Thermodynamik und Transportprozesse (LTTT)Universität Bayreuth
  • Dieter Brüggemann
    • Lehrstuhl für Technische Thermodynamik und Transportprozesse (LTTT)Universität Bayreuth
Original

DOI: 10.1007/s00231-011-0866-9

Cite this article as:
Rösler, F. & Brüggemann, D. Heat Mass Transfer (2011) 47: 1027. doi:10.1007/s00231-011-0866-9

Abstract

The melting process of industrial grade paraffin wax inside a shell-and-tube storage is analyzed by means of numerical simulation and experimental results. For this purpose, the enthalpy porosity method is extended by a continuous liquid fraction function. The extended method is tested using results gained from a gallium melt test inside a rectangular enclosure.

Abbreviations

LHTES

Latent heat thermal energy storage

PCM

Phase change material

HTF

Heat transfer fluid

CFD

Computational fluid dynamics

List of symbols

A

Porosity function in Darcy type source term, kg/m³ s

b

Small numerical constant in porosity function

C

Large constant in Darcy type source term, kg/m³ s

c

Heat capacity, J/kg K

Co

Courant number

d

Diameter, m

g

Gravitational force, m²/s

h

Specific enthalpy, J/kg

L

Latent heat of fusion, J/kg

l

Length, m

p

Pressure, Pa

Sh

Source term in enthalpy equation, J/m³ s

Sm

Darcy type source term in x and y momentum equation, kg/m² s²

Sb

Buoyancy source term in y momentum equation, kg/m² s²

T

Temperature, K or °C

t

Time, s

u

Velocity in x coordinate, m/s

v

Velocity in y coordinate, m/s

x

Horizontal coordinate

y

Vertical coordinate

X

Width of simulation domain

Y

Height of simulation domain

Greek letters

β

Volumetric thermal expansion coefficient

γ

Liquid fraction

η

Dynamic viscosity, kg/m s

λ

Thermal conductivity, W/m K

ρ

Density, kg/m³

Subscripts

erf

Error function

hot

Hot wall

ini

Initial

l

Liquid

m

Melting

ref

Reference

s

Sensible, solid

Copyright information

© Springer-Verlag 2011