Revolutionizing Spacecraft Thermal Control with Dynamic Graphene Radiators: SmartSat

由于在绕地球轨道运行时所经历的极端温度变化，卫星面临着许多技术挑战。这些温度波动对卫星内精密的电子和光学系统构成重大风险，因为过热或过冷可能造成灾难性的损坏。为了保持热稳定性，卫星的热控制器必须平衡排放机载系统产生的内部热量，使航天器免受太阳辐射并持续辐射热量。这项任务特别具有挑战性，因为热辐射是从卫星散发多余热量的唯一手段。卫星朝向太阳的一面可能比暴露在太空冷真空中的一面温度高出200 ° C，导致卫星进入地球阴影时温度迅速变化>200°C。传统的温度控制系统，如被动式散热器，设计用于反射太阳辐射并通过热辐射发射红外光。然而，这些辐射器不能根据卫星相对于地球和太阳的位置关闭或调整。当卫星进入地球阴影时，这种限制可能导致内部系统和部件快速冷却，从而导致温度引起的应力和对精密电子设备的损坏。工程师们利用大而精致的太阳能屏蔽，笨重的热百叶窗，热管和加热器来管理这些极端温度。然而，这些热控制系统不仅笨重，而且消耗大量的可用功率。这种增加的重量和功耗降低了卫星的有效载荷能力和总体效率。一个理想的热控系统将实时适应不断变化的热条件，为卫星的电子系统和部件保持最佳温度。通过根据卫星的位置调整其散热能力，创新的自适应热管理系统不仅可以提高卫星的性能和可靠性，而且还可以大大延长运行寿命，使卫星对制造商和运营商来说更具成本效益和效率。随着航天市场经历关键转变，发射成本降低，发射频率增加，卫星制造商和运营商面临着优化效率和保持盈利能力的压力。因此，迫切需要一种轻量、低成本和低功耗的解决方案来提高卫星效率（例如，通过增加数据吞吐量，同时减少有效载荷和功耗），并使小型卫星能够长期使用。这种创新的解决办法将使以前无法实现的项目成为可能，并开创卫星技术的新时代。

Satellites face numerous technological challenges due to the extreme temperature variations they experience while orbiting the Earth. These temperature fluctuations pose a significant risk to the delicate electronic and optical systems within the satellite, as overheating or overcooling can cause catastrophic damage. To maintain thermal stability, a satellite's heat controller must balance venting the internal heat generated by onboard systems with insulating the craft from solar radiation and continuously radiating the heat. This task is particularly challenging since thermal radiation is the only means to dissipate excess heat from the satellite. The sun-facing side of a satellite can be up to +200°C hotter than the side exposed to the cold vacuum of space, resulting in a rapid temperature change of >200°C when the satellite enters Earth's shadow. Traditional temperature control systems, such as passive radiators, are designed to reflect solar radiation and emit infrared light through thermal radiation. However, these radiators cannot be switched off or adjusted according to the satellite's position relative to the Earth and the Sun. This limitation can lead to rapid cooling of internal systems and components when the satellite enters Earth's shadow, causing temperature-induced stress and damage to delicate electronics. Engineers utilize large but delicate solar shields, bulky thermal louvres, heat pipes, and heaters to manage these temperature extremes. However, these thermal control systems are not only heavy but also consume a significant amount of available power. This increased weight and power consumption reduce the payload capacity and overall efficiency of the satellite. An ideal thermal control system would adapt to changing thermal conditions in real-time, maintaining optimal temperatures for the satellite's electronic systems and components. By modulating its heat dissipation capabilities based on the satellite's position, an innovative adaptive thermal management system would not only improve satellite performance and reliability but also significantly extend operational lifespan, making satellites more cost-effective and efficient for manufacturers and operators. As the space market experiences a critical shift with decreasing launch costs and increasing launch frequency, satellite manufacturers and operators are under pressure to optimize efficiency and maintain profitability. Consequently, there is an urgent need for a lightweight, low-cost, and low-power consumption solution to enhance satellite efficiency (e.g., by increasing data throughput while reducing payload and power consumption) and enable the long-lasting use of small satellites. Such an innovative solution would make previously unattainable projects feasible and usher in a new era of satellite technology.