关键词: 相变材料, 调温面料, 有限元仿真, 数值模拟

Abstract: With the rapid development of human society and economy, the energy problem is becoming more and more serious. Phase change materials can absorb or release heat by phase transition with the change of ambient temperature. Therefore, as a new material that can be reused and efficiently stored energy, it is widely used in various industries. At the same time, with the gradual improvement of the quality of life, people's requirements for clothing fabrics are more than to meet the simple warmth function. The phase change thermo-regulated fabric can keep the temperature stable in the phase change temperature range when the ambient temperature changes, which can ensure the thermal comfort of the human body to a certain extent. Due to the characteristics of the phase change material, the thermo-regulated fabric can be recycled many times, reflecting the low-carbon environmental protection function. In recent years, finite element simulation technology has broad application prospects in the context of the continuous improvement of computer science. The finite element software is used to simulate and analyze the heat transfer process of phase change fabrics, which can more clearly understand the phase change heat transfer process and realize the optimization of the design process and the prediction of the experimental results.
In this paper, the distribution design of phase change area was mainly carried out, and the influence of the distribution of different scatter points on temperature was analyzed, so as to improve the problems of hard hand and poor permeability of traditional phase change temperature regulating fabric. Firstly, the phase change paraffin was used as the core material and the polyacrylate was used as the wall material to prepare the phase change microcapsule emulsion by interfacial polymerization. The phase change microcapsule emulsion was finished on the surface of the pure cotton woven fabric by padding method to obtain the phase change microcapsule thermostat fabric. The performance, especially the thermal performance of the prepared phase change microcapsule thermostat fabric was tested and analyzed, mainly from the load, appearance characterization and heat storage performance. Then, the distribution design of the phase change area of the phase change thermostat fabric was carried out. The phase change area was dispersed into a number of square figures of 1, 3, 5 and 7, and the temperature changes of different distributions of phase change thermoregulation fabrics were observed and analyzed by infrared thermal imager. The temperature regulation effects of phase change fabrics with different scatter points were compared. At the same time, combined with the test data of phase change fabrics, the phase change heat transfer model was established by finite element software to verify the phase change temperature regulation model with different dispersion rates.
The results show that as the number of scattered points increases, the contact area between the phase change area and the phase change area increases, that is, the heat transfer area increases. Therefore, when the phase change material undergoes phase change, the phase change area transmits more heat to the non-phase change area, and the overall average temperature of the thermostat fabric will increase. At the same time, the finite element model can be used to analyze the temperature change of the phase change fabric model under different parameters, which provides a theoretical basis for the optimal design of the phase change fabric and the prediction of the temperature regulation effect in the actual environment.

Key words: phase change materials, thermostat fabric, finite element simulation, numerical simulation