Phase Change Characteritics of Al2O3-H2O Nano-fluids Measured By DSC

Su Yun; Liu Bin; Wang Ruixing; Dong Xiaoyong

doi:10.3969/j.issn.0253-4339.2014.01.033

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Phase Change Characteritics of Al2O3-H2O Nano-fluids Measured By DSC

更新时间：2024-07-18

- Phase Change Characteritics of Al2O3-H2O Nano-fluids Measured By DSC
- Journal of Refrigeration Vol. 35, Issue 1, (2014)
- 作者机构：
  
  天津市制冷技术重点实验室
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0253-4339.2014.01.033
  CLC：
- Published：2014
- 稿件说明：
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Su Yun, Liu Bin, Wang Ruixing, et al. Phase Change Characteritics of Al2O3-H2O Nano-fluids Measured By DSC[J]. Journal of refrigeration, 2014, 35(1).
DOI：

Su Yun, Liu Bin, Wang Ruixing, et al. Phase Change Characteritics of Al2O3-H2O Nano-fluids Measured By DSC[J]. Journal of refrigeration, 2014, 35(1). DOI： 10.3969/j.issn.0253-4339.2014.01.033.

摘要

纳米流体相变时所体现出的特性是其作为蓄冷相变材料使用的重要基础。利用差示扫描量热法分别测量了纳米颗粒粒径为10nm、20nm、50nm、100nm、500nm，质量分数为5%、10%、12%、15%、20%，以及降温速率为2℃/min、3℃/min、5℃/min、7℃/min、9℃/min的Al2O3 纳米流体的凝固点、冰点、融化点、比热及相变潜热的影响。测量结果表明：纳米流体的凝固点、冰点值都高于去离子水；随着颗粒粒径、质量分数和降温速率的增加，纳米流体的凝固点、冰点逐渐升高，而比热值逐渐减小。融化温度随着颗粒粒径、质量分数的增加而增加，且随着降温速率的增加而小幅度的降低。去离子水的相变潜热值高于纳米流体的潜热值；随着纳米颗粒粒径的增加，潜热值越大；随着质量分数和降温速率的增加，相变潜热值越小。

Abstract

As a new phase-change cold storage materials

the thermal properties of nano-fluids are important for its further application. The effect of diameter

mass fraction and cooling rate to solidification point

freezing point

melting temperature

specific heat capacity and latent heat of Al2O3 was measured by Differential Scanning Calorimetry (DSC). The diameter of nanoparticle is 10nm

20nm

50nm

100nm

500nm. The mass fraction is 5%

10%

12%

15%

20%.The cooling rate is 2℃/min

3℃/min

5℃/min

7℃/min

9℃/min. The results show that the nanoparticle plays a critical role on cool storage. The solidification point and freezing point of nanofluids are higher than the deionized water. With the increase of nanoparticle sizes

mass fraction and cooling rate

the solidification point and freezing point of nanofluids will increase

and the specific heat capacity of nanofluids will decrease. The melting temperature will increase with the increase of nanoparticle sizes

mass fraction

and also decrease with the increase of cooling rate. The latent heat of deionized water is higher than the nanofluids’. The latent heat of nanofluids will increase with the increase of diameter of nanoparticle and decrease with the increase of mass fraction and cooling rate.

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Related Institution

Tianjin Key Laboratory of Refrigeration Technology，Tianjin University of Commerce

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Institute of Biothermal Technology, University of Shanghai for Science and Technology

Institute of Biothermal Science, University of Shanghai for Science and Technology

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