基于有限时间热力学的相变蓄放冷特性分析与研究

相变蓄冷技术可以有效解决能源转换与存储问题。但相变材料具有导热性能差,传热不均匀等问题。引入有限时间热力学概念,建立更为实际的蓄冷系统数学模型,对相变蓄冷系统进行热力学优化。通过解析计算,得出蓄冷系统高低温热源与蓄放冷时间的关系式。对比理想状态下与添加不可逆热损耗时蓄冷系统的功率与效率,为相变蓄冷技术的应用提供了理论基础与指导。

Analysis and study of phase-change storage cold storage and cooling characteristics based on finite-time thermodynamics

The phase change cold storage technology can effectively solve the problem of energy conversion and storage. However, phase change materials have poor thermal conductivity and are often uneven during heat transfer. Based on the finite-time thermodynamics, a more realistic mathematical model of the cold storage system is established, and the thermodynamics of the phase change cold storage system is optimized. The relationship between the high and low temperature heat source and the cold storage time of the cold storage system is obtained. The power and efficiency of the cold storage system under ideal condition and under the condition with irreversible heat loss are compared ,and results provide the theoretical basis and guidance for the application of phase change cold storage technology.