Revolutionizing Spacecraft Thermal Control with Dynamic Graphene Radiators: SmartSat

由于卫星在绕地球运行时经历了极端的温度变化，因此它们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了重大风险，因为过热或过冷可能会造成灾难性的损害。为了保持热稳定性，卫星的热控制器必须在排放星载系统产生的内部热量与使飞行器免受太阳辐射和持续辐射热量之间取得平衡。这项任务尤其具有挑战性，因为热辐射是驱散卫星多余热量的唯一手段。卫星面向太阳的一侧比暴露在太空冷真空中的一侧温度高出+200摄氏度，当卫星进入地球阴影时，导致&gt；200摄氏度的快速温度变化。传统的温度控制系统，如被动辐射器，被设计成通过热辐射反射太阳辐射并发射红外线。然而，这些散热器不能根据卫星相对于地球和太阳的位置来关闭或调整。当卫星进入地球阴影时，这种限制可能会导致内部系统和组件迅速冷却，导致温度感应应力和精密电子设备的损坏。工程师们利用巨大但精致的太阳屏、笨重的热百叶窗、热管和加热器来管理这些极端的温度。然而，这些热控系统不仅重量很大，而且还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整体效率。一个理想的热控系统应能实时适应不断变化的热状况，为卫星的电子系统和部件保持最佳温度。通过根据卫星位置调整其散热能力，创新的自适应热管理系统不仅将提高卫星的性能和可靠性，还将显著延长运行寿命，使卫星对制造商和运营商来说更具成本效益和效率。随着发射成本的降低和发射频率的增加，空间市场经历了关键的转变，卫星制造商和运营商面临着优化效率和保持盈利的压力。因此，迫切需要一种轻量级、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，同时降低有效载荷和功耗)，并使小卫星能够长期使用。这样一种创新的解决方案将使以前无法实现的项目变得可行，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.