Journal of Shandong University(Engineering Science) ›› 2019, Vol. 49 ›› Issue (4): 99-107.doi: 10.6040/j.issn.1672-3961.0.2019.018

• Mechanical, Energy and Power Engineering • Previous Articles     Next Articles

Phase change characteristics of paraffin in rectangular storage unit

Huilin ZHOU(),Yan QIU*()   

  1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2019-01-12 Online:2019-08-20 Published:2019-08-06
  • Contact: Yan QIU E-mail:201734101@mail.sdu.edu.cn;anneqiu@sdu.edu.cn
  • Supported by:
    国家自然科学基金资助项目(51576115);国网山东省电力公司科技资助项目(52060616000L)

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Abstract:

To study the heat transfer characteristics of phase change material (PCM) in a storage unit and improve the heat transfer efficiency of phase change heat exchanger, the enthalpy-porous media model and FLUENT program were used to carry out a numerical investigation on the heat transfer process of paraffin in a rectangular heat storage unit. The element liquid fraction β and dimensionless Fo, Ste and Ra were introduced to analyze the influences of different positions outside the tube and inlet temperatures of heat transfer fluid on the melting and solidification process of paraffin. The results showed that the paraffin outside the tube was melted in order from the upper to the left/right part, then the lower part. The total melting time of paraffin in upper part was shorten by at least 20% compared with other parts. Conversely, in the heat release process, the paraffin was solidified in order from the lower, the left/right part and the upper part. The heat transfer mechanism in the unit changed gradually from heat conduction to natural convection in the thermal storage process. The efficiency of heat storage and release could be improved significantly by increasing the temperature difference between heat transfer fluid and paraffin. The criterion of β was obtained by polynomial fitting.

Key words: phase change heat exchanger, PCM, thermal storage, thermal release, numerical simulation

CLC Number: 

  • TK124

Fig.1

Physical model"

Table 1

Physical properties of paraffin"

相变温度/K相变潜热/(kJ·kg-1)密度/(kg·m-3)热导率/(W·(m·K)-1)比热容/(kJ·(kg·K)-1)
固态液态固态液态固态液态
319.68141.919167760.270.111.72.5

Fig.2

Mesh of calculation region"

Fig.3

Distribution of 1#~16# temperature metrical points"

Fig.4

Comparison between numerical simulation and experimental results"

Fig.5

Average Nusselt number Vs. Fourier number during melting"

Fig.6

Paraffin wax temperature Vs. melting time"

Fig.7

Effect of different inlet temperature on paraffin wax′s endothermal temperature"

Fig.8

Effect of different inlet temperature on paraffin wax′s liquid fraction"

Fig.9

Melting fraction changes with X(X=Ste·Fo·Ra0.05)"

Fig.10

Paraffin′s exothermal temperature Vs. soliding time"

Fig.11

Effect of different inlet temperature on paraffin wax's exothermal temperature"

Fig.12

Effect of different time and inlet temperature on paraffin wax's liquid fraction"

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