(IMAGE) Saarland University Caption The first ever machine that cools air using ‘muscles’ made of nickel-titanium. Felix Welsch and Susanne Marie Kirsch helped to develop the cooling system as part of their doctoral research projects. The new type of energy efficient, ecologically sustainable cooling technology that does not require the use of climate-damaging refrigerants is currently being developed by Professor Stefan Seelecke and his team at Saarland University. Credit Credit: Oliver Dietze Usage Restrictions Press photographs can be used free of charge with this press release or in connection with reports about Saarland University provided that a photo credit with the photographer’s name is included. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.