Duan Lihua, Zheng Yanli, Jiang Yunbin, Li Wenhan, Li Limei, Liu Bin, Li Bin, Li Xihong
College of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin 300457, China.
Institute of Agricultural Products Preservation and Processing Science and Technology, Tianjin Academy of Agricultural Sciences, Tianjin 300384, China.
Foods. 2025 Apr 30;14(9):1592. doi: 10.3390/foods14091592.
This paper introduces a novel cold storage: phase-temperature storage, which is characterized by its distinctive coupling jacket structure that connects the sub-storehouse units to the main storehouse. This innovative design facilitates heat transfer while effectively inhibiting mass transfer. Experimental results indicate that polyethylene film, with a thermal conductivity of 0.42 W/m·K, is a more suitable material for constructing sub-storehouses. Enhancing the surface area of the sub-storehouse and increasing convective wind speed are identified as key factors for improving convective heat transfer within the sub-storehouse. Moreover, the optimized design ensures a more uniform temperature distribution inside the sub-storehouse. In contrast to conventional cold storage, the defrosting unit in phase-temperature storage consumes only 5.72 units of energy under equivalent conditions, compared to 154.02 units for conventional cold storage. This demonstrates that the energy expenditure during the defrosting process of phase temperature storage is less than 4% of that required by conventional cold storage, achieving an energy savings rate exceeding 96%. Under identical circumstances, conventional cold storage consumes a total of 36.359 units of electrical energy for defrosting, with 34.231 units being released as defrosting waste heat into the cold storage environment, resulting in a loss rate of approximately 94.13%. Based on apple preservation experiments, phase-temperature storage exhibited significantly superior performance compared to conventional cold storage in terms of apple respiratory peak, weight loss rate, hardness, and TSS content, with respective values of 17.05 CO mg·kg·h, 2.89%, 9.29 N, and 16.3%. In contrast, the conventional cold storage group recorded values of 18.15 CO mg·kg·h, 5.16%, 8.42 N, and 14.9%. These results highlight the exceptional freshness-retention capabilities of phase-temperature storage, underscoring its considerable potential for application in storage systems.
相温库，其特点是具有独特的耦合夹套结构，该结构将子库单元与主库相连。这种创新设计有助于热传递，同时有效抑制质量传递。实验结果表明，导热系数为0.42W/m·K的聚乙烯薄膜是构建子库更合适的材料。增加子库的表面积和提高对流风速被确定为改善子库内对流热传递的关键因素。此外，优化设计确保子库内温度分布更均匀。与传统冷藏库相比，相温库的除霜单元在同等条件下仅消耗5.72单位能量，而传统冷藏库为154.02单位。这表明相温库除霜过程中的能量消耗不到传统冷藏库所需能量的4%，节能率超过96%。在相同情况下，传统冷藏库除霜共消耗36.359单位电能，其中34.231单位作为除霜废热释放到冷藏环境中，损失率约为94.13%。基于苹果保鲜实验，相温库在苹果呼吸峰值、失重率、硬度和总糖含量方面表现出明显优于传统冷藏库的性能，分别为17.05COmg·kg·h、2.89%、9.29N和16.3%。相比之下，传统冷藏库组的数值分别为18.15COmg·kg·h、5.16%、8.42N和14.9%。这些结果突出了相温库卓越的保鲜能力，凸显了其在存储系统中的巨大应用潜力。
