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We are still far from build a dyson spherebut China seems willing to materialize The first great Solar Energy Station in orbit With the Earth, a simpler version of the concept that, even so, NASA scientists discarded in the 70-80 for being economically unfeasible.
Times have changed and the world is in full energy transition to renewable sources. China, who has no shame when copying advances from other nations, provided they serve their purposes, work at the same time in Your own Starship: A totally reusable giant rocket called CZ-9. Uniting points, the Chinese Engineering Academy (CAE) wants to take advantage of the future rocket To install a huge solar plant in space, 36,000 km on the earth.
10 years ago, when China announced that it would investigate the space solar energy stations, everyone seemed to be a theoretical study or one more concept proof, such as those that continue to develop Today in NASAthe Jaxa Japanese agency and The European Space Agency (THAT). However, Chinese officials have put An ambitious roadmap on the table that has caught the rest of the countries totally off guard.
The first prototype of the Chinese space center, 500 kW of power, is expected by 2030. A fully operational version of 20 MW would be ready in 2035 (while the station in its final form, of 2 GW, is scheduled for 2050.
It is not a small thing for a technology that has never been implemented, much less on a large scale. It will presumably require hundreds of launches and the assembly of thousands of solar panels in geostation orbit, 36,000 km altitude, where the profitability of launching tons and tons of load will depend on the fact that the CZ-9 rocket be fully reusable, as the Chinese promise.
Long Lehao, a rocket scientist in the fall, did not lack symiles to justify this huge media deployment. “It is a project as important as transferring the prey of the three throats to a geostationary orbit He said during a conference in the Chinese Academy of Sciences (CAS).
Of course, they will have to put small demonstrators in orbit of what will end up being the Space Solar Station. China has already tested From hot air balloonsand is building a receiving station in Chongqing.
By 2026, the Chinese Space Technology Academy (CASC) plans to display its first 10 kW solar panels in space with the aim of demonstrating wireless energy transmission. He hopes to transmit up to 1 kW by laser and up to 4 kW by microwave, both to the receptor station on Earth and a nearby satellite, which suggests a future in which satellite constellations could be combined with the solar station.
How will the solar station that China plans to install in space
Little is known at the technical level of what the first farm of solar panels will be deploy in geostationary orbitsince no project has been officially selected. But Eureka List three concepts, out of different Chinese laboratories, which have enough ballots:
- In 2014, the Chinese Space Technology Academy (CASC) proposed a 11.8 km long station with a circular transmission antenna of 1 km in diameter; In 2021, the concept was updated with a modular design, easier to assemble, but with the disadvantage of a rectangular beam
- That same year, the Xidian University published a study on a spherical station with a diameter of 8 to 10 km and a system that would take advantage of semi -reflective panels to concentrate light on internal photovoltaic cells
- In 2016, the Shenyang Aerospace University proposed a similar concept that, instead of a spherical design, has a cylindrical design that refracts sunlight towards internal photovoltaic panels, a design that simplifies the monitoring of the sun
What these concepts have in common is that they rotate like sunflowers to always point towards the sun, so their huge solar panels capture an inexhaustible flow of solar energy that then transmit to the earth. How do they transmit it? Concentrating a laser or microwave beam towards large antennas in receiving stations on Earth, where it becomes electricity to store in batteries or pour into the electricity grid.
The wireless transfer takes advantage of a physical phenomenon known as interference or overlap of waves. It is usually explained by visualizing a pond in which you submerge both hands to form waves that spread at the same time. There are areas where waves are stronger because they advance together (they add up to the phase) and others in which they are canceled (they are out of phase).
When waves work together, energy is not lost, but is concentrated in a specific direction. If there are several sources operating in a coordinated manner (all issuing at the same time, in the same phase) the energy can be directed in one direction. But if each source works a little earlier or a little after the others, the direction of the beam can be controlled.
As a magnifying glass that concentrates the light at one point, it is possible to adjust the synchronization of these sources to focus energy in an area smaller than the original (such as the antenna on the surface of the earth). This correction can be carried out on the Nanoseconds of Electronics scale, which allows the energy direction to be handled very quickly or assigned to different locations (different antennas).
In geostationary orbit, solar panels can be operated all the time and with conversion efficiencies superior to those that the panels achieve on this side of the atmosphere, hence the advantage of a photovoltaic station in space. However, the complexity of its deployment and doubts about the safety and efficiency of wireless transmission make all this technology still without being tested since studying in the 70s and 80s.
China aspires to lead the new space solar energy career, as leading the earth’s photovoltaic energy, but will not be alone. Japan became 2015 In the first country that managed to transmit 1,8 kW in microwave wirelessly. Of course, at a distance of 50 meters, but it is space solar energy is an issue that continues to investigate closely, as well as Europe, the United States and the occasional private company.
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