Preparation and Performance Analysis of Graphite Additive/Paraffin Composite Phase Change Materials
Abstract
:1. Introduction
2. Materials and Experimental Methods
2.1. Material and Preparation
2.2. Test System of Heat Transfer Performance
2.3. Experimental Preparation
- (1)
- Preparing stage: Number the test tubes filled with CPCM with different additives (GO, EG, and GR) and different loadings (0.5%, 1.0%, 1.5% and 2.0%). Put the test tubes into the low-temperature water bath for 2 h to unify their temperatures.
- (2)
- Charge stage: Transfer the test tubes to the high-temperature water bath. The charge processes and the temperature changes of the CPCM are recorded by the digital camera and the data acquisition system, respectively. When the temperatures collected by the thermocouples are stable at 70 °C, the charge stage is deemed to have been completed.
- (3)
- Discharge stage: After the charge stage, the test samples are rapidly transferred to the low-temperature water bath. The temperature changes of the CPCM are recorded by the data acquisition system until they are stable at 20 °C.
2.4. Measurements of the Thermophysical Properties
3. Results and Discussions
3.1. Compatibility of Composite PCM
3.2. Analysis of the Charge Process
3.3. Analysis of the Discharge Process
3.4. Thermophysical Properties
3.4.1. Thermal Conductivity
3.4.2. Latent Heat
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Paraffin | Thermal conductivity (W/m·K) | 0.2 |
Melting point (°C) | 52 | |
Density (kg/m3) | 800 | |
Latent heat (J/g) | 160.8 | |
Expanded graphite | Carbon content (%) | ≥99.5 |
Particle size (mesh) | 325 | |
Expansion ratio (times) | 40~425 | |
Graphene | Thickness (nm) | 0.55~3.8 |
Specific surface area (m2/g) | 50~100 | |
Thermal conductivity (W/m·K)) | ~5000 | |
Graphene oxide | Purity (%) | 95~99 |
Thickness (nm) | 0.8~1.2 |
CPCM | Melting Point (°C) | Latent Heat (J/g) | Liquid Specific Heat Capacity (J/kg·K) | Solid Specific Heat Capacity (J/kg·K) | Thermal Conductivity (W/m·K) |
---|---|---|---|---|---|
Pure paraffin | 52°C | 146.97 | 2773.758 | 3886.135 | 0.201 |
0.5% EG | 51°C | 137.56 | 2683.367 | 3623.256 | 0.224 |
1.0% EG | 51°C | 125.47 | 2522.432 | 3418.309 | 0.239 |
1.5% EG | 52°C | 113.98 | 2384.305 | 3178.919 | 0.252 |
2.0% EG | 53°C | 101.84 | 2240.271 | 3085.336 | 0.272 |
0.5% GO | 51°C | 129.41 | 2632.573 | 3609.049 | 0.244 |
1.0% GO | 51°C | 119.57 | 2338.629 | 3240.265 | 0.266 |
1.5% GO | 52°C | 108.69 | 2215.676 | 3189.368 | 0.286 |
2.0% GO | 55°C | 100.76 | 2102.365 | 3055.634 | 0.309 |
0.5% GR | 52°C | 131.60 | 2409.717 | 3224.259 | 0.266 |
1.0% GR | 52°C | 118.51 | 2144.818 | 3153.062 | 0.289 |
1.5% GR | 55°C | 106.12 | 2031.645 | 3021.319 | 0.312 |
2.0% GR | 56°C | 98.33 | 1931.629 | 3010.212 | 0.348 |
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Li, W.; Dong, Y.; Zhang, X.; Liu, X. Preparation and Performance Analysis of Graphite Additive/Paraffin Composite Phase Change Materials. Processes 2019, 7, 447. https://doi.org/10.3390/pr7070447
Li W, Dong Y, Zhang X, Liu X. Preparation and Performance Analysis of Graphite Additive/Paraffin Composite Phase Change Materials. Processes. 2019; 7(7):447. https://doi.org/10.3390/pr7070447
Chicago/Turabian StyleLi, Wei, Yan Dong, Xu Zhang, and Xueling Liu. 2019. "Preparation and Performance Analysis of Graphite Additive/Paraffin Composite Phase Change Materials" Processes 7, no. 7: 447. https://doi.org/10.3390/pr7070447