11. June 2018 | Research & Development

“Spacetex2” researches functional textiles under zero gravity

Schwitzen für die Wissenschaft
Sweating for science - in the project Spacetex2, Dr Alexander Gerst will test the cooling performance of functional shirts both on Earth (see picture of him during a training session at the European Astronaut Centre EAC in spring 2018) and in space.
Source: DLR
When the German ESA astronaut Dr Alexander Gerst sets off on 6 June 2018 for his “Horizons” mission at the International Space Station ISS, numerous experiments will be waiting for him. The Spacetex2 project includes clothing physiology experiments which will, for the first time, investigate the interaction of the body, clothing and climate under zero gravity conditions with regard to wear comfort. The findings of Spacetex2 help to optimise clothing for astronauts (known as IVA “intra-vehicular activity” clothing, i.e., clothing worn within the ISS), also with regard to long-term missions, for example, for the planned manned flight to Mars in the 2030s. As per the mission goal “Knowledge for Tomorrow”, the project also provides important insights for the development of new functional textiles which can also be used on Earth under extreme climatic and physiological conditions. From the perspective of global warming and climate change, this aspect is becoming ever more important.

“Alexander Gerst has to sweat quite a lot in space in order to activate the cooling performance of the functional shirts,” outlines Project Manager Dr Jan Beringer from Hohenstein. The fact that sweating under zero gravity is completely different from sweating on Earth was discovered in 2014 during the preceding Spacetex project and is a helpful framework condition for the experiments. Jan Beringer explains, “Like on Earth, the human body emits heat when under strain and tries to cool itself down in this way. However, zero gravity changes heat exchange on the surface of the body - there is no loss of heat due to convection when in space. During physical activity, heat thus builds up quicker than on earth. The result of this is that the core body temperature rapidly climbs to values that are too high to be healthy. Therefore, it is very important to optimise heat exchange through the evaporative cooling of sweat by clothing made of appropriate materials.”

For Alexander Gerst, sweaty experiments in the name of science are nothing new. During the “Blue Dot” mission back in 2014, his deployment to space provided valuable findings for the preceding Spacetex project which were included in the further development of the functional shirts now specifically manufactured for the ISS.
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