Performance of a solar PV/T system applying a paraffin/graphene oxide composite phase change material

doi:10.19799/j.cnki.2095-4239.2022.0660

Abstract

Abstract:

Paraffin/GO (graphene oxide) composite phase change materials are prepared and characterized for latent heat, thermal conductivity, and fluidity to increase the energy efficiency of solar PV/T (photovoltaic/thermal) systems. With a phase change temperature of 35 ℃, a latent heat of phase change of 42.93 J/g, a maximum thermal conductivity of 0.505 W/(m·K), and a viscosity-temperature fit of 0.91, the composite phase change material with a GO mass fraction of 0.02% has the best overall performance when compared to other known composite phase change materials. Two identical flat-plate heat pipe solar PV/T systems are built, and paraffin/GO composite phase change materials (a GO mass fraction of 0.02% and water) are operated as the heat transfer medium for both systems to analyze the effect of the paraffin/GO composite phase change material on the thermoelectric performance of a solar PV/T system. Herein, characterization of the thermoelectric performance of the solar PV/T system using thermal and electrical efficiencies was performed. Results show that under the same operating conditions, the thermoelectric performance of the flat-plate heat pipe solar PV/T system running (paraffin wax mass fraction of 30% and GO mass fraction of 0.02%) with a paraffin/GO composite phase change material is improved compared to that running with water, with an increase in system thermal efficiency of 92.28%, electrical efficiency of 8.87%, and heat collection in the heat exchanger tank of 15.80%. This study provides value for applying composite phase change materials (fluids) in solar energy storage.

Key words: nanoparticles, composite phase change materials, PV/T system, thermoelectric properties

CLC Number:

TK 519

Hongbing CHEN, Xuening GAO, Tao LIU, Congcong WANG, Rui ZHAO, Junhui SUN, Chuanling WANG, Di HE. Performance of a solar PV/T system applying a paraffin/graphene oxide composite phase change material[J]. Energy Storage Science and Technology, 2023, 12(3): 661-668.

Figures/Tables 13

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溶液种类	升温过程			降温过程
溶液种类	第1个峰值温度/℃	第2个峰值温度/℃	相变潜热/(J/g)	第1个峰值温度/℃	第2个峰值温度/℃	相变潜热/(J/g)
30%石蜡溶液	18.5	43.1	35.55	13.6	37.2	41.25
30%石蜡+0.01%GO	18.2	43.6	34.76	13.6	37.3	40.05
30%石蜡+0.02%GO	18.5	42.9	36.82	13.0	30.7	42.93
30%石蜡+0.03%GO	19.0	44.0	38.39	13.6	30.6	39.88

材料种类	A	B	R²
30%石蜡	4.29	31.75	0.94
30%石蜡+0.01%GO	8.35	33.22	0.92
30%石蜡+0.02%GO	19.14	24.71	0.91
30%石蜡+0.03%GO	36.93	20.48	0.86

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