| PCM | Phase change material |
| NEPCM | Nano-enhanced phase change material |
| HRSS | Heat recovery–storage system |
| LHTES | Latent heat thermal energy storage |
| T max | Maximum temperature |
| T med | Average temperature |
| ϵ | Efficiency of the equipment |
| Q1 | Quantity of heat of the primary agent |
| Q2 | Quantity of heat of the secondary agent |
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