Solid-liquid phase change thermal diode (SL-PCTD) is potential for thermal rectification, however the unsustainable thermal rectification ratio of the SL-PCTD hampers its practical application, demanding a reasonably compatible design. Herein, a SL-PCTD composed of calcium chloride hexahydrate (CaCl₂·6H₂O) and paraffin wax is investigated, where the supercooling effect of CaCl₂·6H₂O plays a significant role in thermal rectification. In the forward direction, natural convection sustains in the SL-PCTD below the melting temperature (30 °C) due to the supercooling, leading a robust heat transfer within a temperature bias range of 10–40 °C. In the reverse direction, heat flux should be inhibited for effective thermal rectification, thus supercooling is dislodged via manual supercooling release (MSR) within a large temperature range of 30–7 °C. As a consequence, thermal rectification ratio of 2.95 is achieved, which is competitively sustainable at large temperature bias compared to the SL-PCTD without supercooling effect. Furthermore, a theoretical model base on thermal resistance approach is proposed to analyze the supercooling effect on thermal rectification comprehensively, and the theoretical and experimental results find a great agreement. According to the theoretical analysis, the SL-PCTD with supercooling works at a large thermal rectification ratio of around 2.8 within a wide temperature bias range of 33–87 °C, indicating the significant role of supercooling in thermal rectification.

固液相变热二极管（SL-PCTD）具有进行热精馏的潜力，但是SL-PCTD的不可持续的热精馏比妨碍了其实际应用，需要合理的兼容设计。本文研究了由六水合氯化钙（CaCl ₂ ·6H ₂ O）和石蜡组成的SL-PCTD ，其中CaCl ₂ ·6H ₂的过冷效果O在热精馏中起着重要作用。在正方向上，由于过冷，SL-PCTD中的自然对流保持在熔融温度（30°C）以下，从而在10–40°C的温度偏差范围内实现了稳健的传热。在相反的方向，应抑制热通量以进行有效的热整流，因此在30–7°C的较大温度范围内，通过手动过冷释放（MSR）可以去除过冷。结果，实现了2.95的热精馏比，与没有过冷效果的SL-PCTD相比，在较大的温度偏差下具有竞争优势。此外，提出了一种基于热阻方法的理论模型来全面分析过冷对热精馏的影响，在理论和实验结果上找到了很好的一致性。根据理论分析，具有过冷功能的SL-PCTD可以在33-87°C的宽温度偏置范围内以大约2.8的大热精馏比工作，这表明过冷在热精馏中具有重要作用。