Abstract: Using glass fibers and phase change microcapsules with different ratios and ingredients as raw materials, energy storage fiber-reinforced vacuum insulation panel (VIP) composite core materials were prepared via a wet forming process. As the content of phase change powder increased from 0% to 45%, the thermal conductivity, affected by solid-state heat conduction, rose from 2.61 mW/(m·K) to 4.84 mW/(m·K). Among these, the core material containing 37℃ phase change material demonstrated the best comprehensive performance (2.84 mW/(m·K)). By reducing the thickness of the single-layer core material from 2 mm to 0.8 mm, the thermal conductivity was significantly reduced to 2.22 mW/(m·K). Vacuum degree had a significant impact on performance. The performance was stable when the internal pressure was lower than 100 Pa and a sharp rise in thermal conductivity otherwise. Although the introduction of phase change materials slightly increased the initial internal pressure, it effectively suppressed the increase in internal pressure during the static period, improving the long-term service stability of the board. This energy storage fiber-reinforced VIP, while maintaining excellent thermal insulation performance, endowed the core material with heat storage and temperature regulation functions, demonstrating significant application value in the field of energy conservation and consumption reduction.

Key words: vacuum insulation panel, glass fiber, phase change material, core material, thermal performance