A new approach to determine the degree of subcooling in phase-change paraffin emulsion: equilibrium volumetry

Lin CHEN; Yafei WU; Liming CHE

doi:10.11949/0438-1157.20190293

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A new approach to determine the degree of subcooling in phase-change paraffin emulsion: equilibrium volumetry

更新时间：2026-03-25

- A new approach to determine the degree of subcooling in phase-change paraffin emulsion: equilibrium volumetry
- CIESC Journal Vol. 70, Issue 9, Pages: 3370-3376(2019)
- 作者机构：
  
  1. 四川工商职业技术学院酒类与食品工程系,四川,成都,611830
  2. 厦门大学化学化工学院化学工程与生物工程系,福建,厦门,361005
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190293
  CLC： O648.23
- Online First：05 September 2019，
  
  Published：05 September 2019
- 稿件说明：
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Lin CHEN, Yafei WU, Liming CHE. A new approach to determine the degree of subcooling in phase-change paraffin emulsion: equilibrium volumetry[J]. CIESC Journal, 2019, 70(9): 3370-3376.
DOI：

Lin CHEN, Yafei WU, Liming CHE. A new approach to determine the degree of subcooling in phase-change paraffin emulsion: equilibrium volumetry[J]. CIESC Journal, 2019, 70(9): 3370-3376. DOI： 10.11949/0438-1157.20190293.

摘要

石蜡相变乳液是集储热与传热于一体的新型功能流体，具有广阔的应用前景。但石蜡相变乳液在降温时会出现过冷现象，极大降低了其储热与传热的性能。采用差示扫描量热法（DSC）测量石蜡相变乳液的过冷度受到升/降温速率的影响，且升/降温速率越大，测得过冷度越大。提出一种测量石蜡相变乳液过冷度的方法——平衡态比容法。该方法通过测量石蜡相变乳液在不同温度下的比容，以确定乳液中石蜡粒子在升/降温过程中的相变温度，并进一步求解石蜡相变乳液的过冷度。实验结果表明，本研究提出的平衡态比容法能准确测量石蜡相变乳液的过冷度，并从比容变化的角度揭示石蜡相变乳液过冷现象的机理。

Abstract

Paraffin phase change emulsion is a new type of functional fluid that integrates heat storage and heat transfer

and has broad application prospects. However

the application of phase-change paraffin emulsion suffers from subcooling phenomenon

which weakens its ability to store and transfer heat remarkably. The degree of subcooling in phase-change paraffin emulsion is conventionally determined by differential scanning calorimetry (DSC)

the result of which is dependent on the heating / cooling rate. As the heating / cooling rate increases

the degree of subcooling is higher. Here an equilibrium volumetric method was presented to determine the degree of subcooling in phase-change paraffin emulsion by measuring its specific volume at different temperatures. The specific volume obtained was plotted against the temperature to identify the phase transition temperature of paraffin during heating / cooling process

then the degree of subcooling was deduced from the phase transition temperatures obtained. The results showed that the degree of subcooling in phase-change paraffin emulsion can be measured accurately using the equilibrium volumetric method presented in this work. The results also revealed the mechanism of subcooling in phase-change paraffin emulsion from the point of view of specific volume change.

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