November 19, 2020

...AND CHEAPER...:

Solar power stations in space could be the answer to our energy needs (Amanda Jane Hughes, Lecturer, Department of Mechanical, Materials and Aerospace Engineering, University of Liverpool & Stefania Soldini, Lecturer in Aerospace Engineering, University of Liverpool, 11/19/20, The Conversation)

Renewable energy technologies have developed drastically in recent years, with improved efficiency and lower cost. But one major barrier to their uptake is the fact that they don't provide a constant supply of energy. Wind and solar farms only produce energy when the wind is blowing or the sun is shining - but we need electricity around the clock, every day. Ultimately, we need a way to store energy on a large scale before we can make the switch to renewable sources.

A possible way around this would be to generate solar energy in space. There are many advantages to this. A space-based solar power station could orbit to face the Sun 24 hours a day. The Earth's atmosphere also absorbs and reflects some of the Sun's light, so solar cells above the atmosphere will receive more sunlight and produce more energy.

But one of the key challenges to overcome is how to assemble, launch and deploy such large structures. A single solar power station may have to be as much as 10 kilometres squared in area - equivalent to 1,400 football pitches. Using lightweight materials will also be critical, as the biggest expense will be the cost of launching the station into space on a rocket.

One proposed solution is to develop a swarm of thousands of smaller satellites that will come together and configure to form a single, large solar generator. In 2017, researchers at the California Institute of Technology outlined designs for a modular power station, consisting of thousands of ultralight solar cell tiles. They also demonstrated a prototype tile weighing just 280 grams per square metre, similar to the weight of card.

Recently, developments in manufacturing, such as 3D printing, are also being looked at for this application. 

Posted by at November 19, 2020 12:00 AM

  

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