| Personalized thermal management technologies for the human body not only play a vital role in human thermal comfort and health,but also have an important impact on reducing energy consumption.Wearable thermoelectric coolers(w-TECs)show excellent application prospects in the field of personal thermal management due to their excellent features such as zero emissions,high efficiency,light weight,and long-term stability.However,due to the problems of w-TEC itself,such as rigid mechanical structure and low cooling efficiency,wTEC has not been truly applied to the personalized thermal management of the human body.This paper starts with the analysis of the energy conversion mechanism and mechanical structure of the thermoelectric refrigeration device,analyzes the factors that affect the refrigeration efficiency and mechanical flexibility of the thermoelectric refrigeration device,and makes corresponding improvement measures for these influencing factors,and finally improves the thermoelectric refrigeration device.cooling performance and mechanical flexibility.The main research contents of this paper are as follows:By analyzing the energy conversion mechanism of thermoelectric coolers,a flexible and large heat capacity double-layer hydrogel radiator is proposed to provide heat dissipation support for thermoelectric coolers.This heat sink has the characteristics of high thermal capacity and low contact thermal resistance at the same time.The experimental test results show that this double-layer structure radiator can greatly improve the cooling performance of the thermoelectric cooler.Under the action of this double-layer structure heat dissipation device,the temperature of the cold side of the device can be reduced by 9～10.5℃,and the stable cooling time can reach about 5h.The thermal and mechanical structures of the thermoelectric cooling device are optimized by using a combination of Comsol simulations and experiments.Factors including the topology of the thermoelectric arms,the number of arms,and the arm gap fill are specifically optimized.It is found that the best performance of the device is designed by using AR ≥ 3,FF=10%-15%,and filling the arms with materials with low thermal conductivity.In addition,the mechanical structure of the device is optimized,so that the minimum bending radius of the device can reach 7.5mm.By assembling the relevant device performance testing system,the performance of the device designed in this research was tested.It mainly includes tests on the stability of the performance of the device under different ambient temperatures,heat source temperatures,bending states and multiple bending.Finally,the designed device was worn on the human body and tested on the human body.The test results show that the wearable thermoelectric cooling device designed in this study has good mechanical flexibility and cooling performance.This study provides reference ideas and guidance methods for the realization of thermoelectric cooling devices for human thermal management and energy consumption reduction. |
