Preparation and properties of binary composite phase-change materials based on solar low-temperature heat storage

doi:10.19799/j.cnki.2095-4239.2023.0482

Abstract

Abstract:

The working temperature range for the battery backplane and the heat storage capacity in solar PV/T systems using phase-change materials need to be improved. In this report, docosane-dodecanol (DE-CP) binary phase-change materials with different mass fractions were prepared using the melt-mixing method, and their latent heat was tested and analyzed. The phase-change temperature range for the binary phase-change material is 20–50 ℃, which essentially covers the working temperature for the battery backplane in the PV/T system. Compared with other binary phase-change materials, the latent heat of the binary phase-change material with 60% DE mass fraction is the largest at 243.8 kJ/kg. Moreover, the high-temperature phase-change peak area for the binary phase-change material with a mass ratio of DE to CP of 6∶4 is larger than the low-temperature phase-change peak area. The distribution of the two phase-change peaks indicates that the binary phase-change material with a DE mass fraction of 60% is more suitable for application in solar PV/T systems. EG (expanded graphite) was then added to the binary phase-change material as a supporting substance to adsorb the material to enhance its thermal conductivity; finally, the composite phase-change material was obtained. The latent heat, compatibility, and thermal conductivity of DE-CP/EG composite phase-change material were measured and analyzed. The results show that the phase-change temperature range for the DE-CP/EG composite phase-change material remains at 20?–?50 ℃. There is good compatibility among the three raw materials, and the thermal conductivity increases from 0.135 W/(m·K) for the original binary phase-change material to 1.383 W/(m·K), which solves the problem of the low thermal conductivity of the phase-change material and provides a reference for the application of the composite phase-change material in solar PV/T systems.

Key words: composite phase change materials, docosane, lauryl alcohol, expanded graphite, thermal performance, heat storage

CLC Number:

TK 519

Hongbing CHEN, Chunyang LI, Congcong WANG, Men LI, Haoyang LU, Yuhang LIU, Yan ZHANG. Preparation and properties of binary composite phase-change materials based on solar low-temperature heat storage[J]. Energy Storage Science and Technology, 2023, 12(12): 3663-3669.

Figures/Tables 10

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被测样品	采集电压/V	采集时间 /s	采集模式	重复采集次数/次	时间间隔 /min
DE-CP(液态)	1	1	快速	5	3
DE-CP(固态)	1.5	5	正常	5	3
DE-CP/EG	2	2	正常	5	3

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