Thermal Bridge Effect of Unidirectional Cutting Vacuum Insulation Panels

In order to improve the universality of the application of unidirectional cutting vacuum insulation panels, the emphasis is on the research of its thermal insulation performance, and the thermal bridge effect is proposed to be studied. In this paper, the concept of linear heat transfer rate is used as the benchmark to evaluate the thermal bridge effect. By using the method of theoretical analysis and establishing a mathematical model, the thermal bridge effect of the unidirectional cutting vacuum insulation panel is analyzed. According to the steady heat transfer boundary conditions, a heat flow transfer model is proposed to analyze and calculate the thickness of the barrier film and the total thickness of VIP. The experimental results show that the thickness of the core material and heat conduction, the thickness of the barrier and heat conduction, the size of the VIP and the gap between the splices all affect the thermal bridge effect. The heat conduction and thickness of the core material are improved, the heat conduction and thickness of the barrier are reduced, the heat conduction and thickness of the medium filled in the splice joint are reduced, the VIP size is increased, and the thermal bridge effect is weakened. In this paper, the effective thermal conductivity of the unidirectional cutting vacuum insulation plate with or without thermal bridge effect can be increased by 42%, thereby realizing the efficient utilization of the unidirectional cutting vacuum insulation panel and increasing its thermal insulation performance.