Passive thermal management strategies are one of the most promising ways to reduce energy consumption for intermittent heat dissipation. However, the existing strategies encounter tough obstacles on their way to commercialization due to their low efficiencies and high costs. Herein, we propose a passive thermal management strategy that relies on moisture desorption from hygroscopic salt solutions through a protective membrane that only allows water vapor to pass through; importantly, it can spontaneously recover cooling capacity during off hours. We selected lithium bromide as a cost-effective sorbent while avoiding crystallization. Outstandingly, the strategy can provide an effective cooling capacity ( = 11.5°C) for ∼400 min, while the measured heat flux can reach 75 kW/m. By employing the strategy in a real computing device, its performance is improved by 32.65% with a record-high cost effectiveness. The strategy can be useful for various applications that need intermittent thermal regulation, with few technological barriers.

中文翻译：

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用于高性能、超低成本和长持续时间的电子热管理的膜封装、解吸湿被动冷却

被动热管理策略是减少间歇散热能耗最有前途的方法之一。然而，现有策略由于效率低、成本高，在商业化过程中遇到了严峻的障碍。在此，我们提出了一种被动热管理策略，该策略依赖于通过仅允许水蒸气通过的保护膜从吸湿性盐溶液中解吸水分；重要的是，它可以在非工作时间自动恢复制冷能力。我们选择溴化锂作为具有成本效益的吸附剂，同时避免结晶。值得注意的是，该策略可以提供约 400 分钟的有效冷却能力（= 11.5°C），而测量的热通量可达 75 kW/m。该策略在实际计算设备中应用后，性能提升了32.65%，性价比创历史新高。该策略可用于需要间歇热调节的各种应用，且几乎没有技术障碍。