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Suaineadh: Space construction techniques tested at Strathclyde

Rocketeer — Thu, 07/06/2012 - 11:41am

(Source: University of Strathclyde, via Nextbigfuture)

Researchers at Strathclyde University have recently conducted a sounding rocket flight to test the deployment of innovative 'space web' structures, which would support future satellite solar power applications:-

Dr Massimiliano Vasile, of the University of Strathclyde’s Department of Mechanical and Aerospace Engineering, who is leading the space based solar power research, said: “Space provides a fantastic source for collecting solar power and we have the advantage of being able to gather it regardless of the time of the day or indeed the weather conditions.

“In areas like the Sahara desert where quality solar power can be captured, it becomes very difficult to transport this energy to areas where it can be used. However, our research is focusing on how we can remove this obstacle and use space based solar power to target difficult to reach areas.

“By using either microwaves or lasers we would be able to beam the energy back down to earth, directly to specific areas. This would provide a reliable, quality source of energy and would remove the need for storing energy coming from renewable sources on ground as it would provide a constant delivery of solar energy.

“Initially, smaller satellites will be able to generate enough energy for a small village but we have the aim, and indeed the technology available, to one day put a large enough structure in space that could gather energy that would be capable of powering a large city.”

Last month, a team of science and engineering students at Strathclyde developed an innovative ‘space web’ experiment which was carried on a rocket from the Arctic Circle to the edge of space.

The experiment, known as Suaineadh – or ‘twisting’ in Scots Gaelic, was an important step forward in space construction design and demonstrated that larger structures could be built on top of a light-weight spinning web, paving the way for the next stage in the solar power project.

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There is a fundamental issue

Artemi — Thu, 07/06/2012 - 2:19pm

There is a fundamental issue with bringing energy to Earth by any means.

If an additional energy influx from human activities is not considered, Earth is a pretty balanced system. 174PW of the solar income are ether absorbed by land or reflected/radiated back. If there is an additional energy influx from human activity, the balance is upset. At the moment the world energy consumption is increasing by approximately 2.3..2.5% annually. Most of the energy is a direct influx rather than tapping one way or another into the solar income. With such rate the surface temperature would rise to the boiling point in about 300...400 years. Space based energy generation does not solve the overheating issue. It is still the same influx of additional unbalanced energy.

There are only two ways to avoid the issue. One is to decrease the solar income to balance the additional energy. The second solution is to have all energy generated from solar income down ON the earth surface. I stress "on the surface" because in that case no additional influx would be generated.

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No there isn't, not

Rocketeer — Fri, 08/06/2012 - 10:09pm

No there isn't, not really.

While waste heat will in principle limit the energy generation that can take place on Earth, the current amount generated is vanishingly small in comparison with the total insolation. Total solar incident flux is around 174PW. The total waste heat from fossil fuel generation is 0.007% of that, a tiny fraction.

That would be equivalent to taking the solar constant from 1366W/m2 to 1366.096W/m2...BUT the solar constant ISN'T CONSTANT... it varies by 0.1-0.2% over the solar cycle. The natural variations are larger than the size of heat input from fossil fuels.

The Sun has also brightened by nearly 10% since advanced life emerged (and continues to brighten steadily), and the planet remains at a habitable temperature, which indicates that a homeostatic process is occurring to regulate the planetary temperature, though we don't properly understand what it is.

The benefit of space solar power is that it would REPLACE an energy source which generates waste heat+CO2 with one which only generates waste heat. If the IPCC models are to be believed, CO2 is by far the greater concern. Also, with space solar power, the first stage of conversion of solar to electrical to microwave energy happens outside the atmosphere, so waste heat losses at that stage are radiated directly to space and do not affect Earth.

Extrapolating exponential growth of energy use 3-4 centuries into the future is unlikely to be valid. The human population on Earth is projected to peak this century at around 10 billion, and then start to decrease, and energy use will follow a similar curve.

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