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Journal of Thermal Analysis and Calorimetry

, Volume 134, Issue 3, pp 1757–1763 | Cite as

An improved heat transfer model for building phase change material wallboard

  • Xing Jin
  • Huoyan Hu
  • Xing Shi
  • Xin Zhou
  • Liu Yang
  • Yonggao Yin
  • Xiaosong Zhang
Article
  • 165 Downloads

Abstract

For improving the accuracy of the effective heat capacity model and increasing the computing speed of the enthalpy model, an improved numerical model for phase change material wallboard was proposed in the research. This improved model was expected to combine the advantages of the enthalpy model and the effective heat capacity model. This improved model was firstly validated by the literature results, and then it was compared with the enthalpy model and the effective heat capacity model. Based on the simulation results from the improved model, it was concluded that the accuracy of this improved model was the same as the enthalpy model and higher than that of the effective heat capacity model. In addition, the computing speed of this improved model was much higher than that of the enthalpy model because of its much lower number of iterations.

Keywords

Improved numerical model Heat transfer Phase change material Wallboard 

List of symbols

cp

Specific heat capacity/kJ kg−1 K−1

d

Time step size/s

h

Space step size/m

H

Enthalpy/kJ kg−1

i

Space node

j

Time node

L

Heat of fusion/kJ kg−1

m

Number of space nodes

N

Number of iterations

t

Time/s

T

Temperature/°C

T0

Temperature value when enthalpy is 0 kJ kg−1

Tc

Center point temperature value of phase change temperature range

x

Coordinate

Greek symbols

δ

Thickness/m

ΔT

Half of phase change temperature range

ρ

Density/kg m−3

λ

Thermal conductivity/W m−1 K−1

Subscript

c

Center

l

Liquid

m

Molten

s

Solid

sur

Surface

Notes

Acknowledgements

This research was supported by the Ministry of Science and Technology of China under Grant No. 2016YFC0700102, the Natural Science Foundation of China under Grant No. 51308104, and the Fundamental Research Funds for the Central Universities.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.School of ArchitectureSoutheast UniversityNanjingPeople’s Republic of China
  2. 2.Key Laboratory of Urban and Architectural Heritage Conservation (Southeast University)Ministry of EducationNanjingPeople’s Republic of China
  3. 3.School of Energy and EnvironmentSoutheast UniversityNanjingPeople’s Republic of China

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