Purdue University Turbomachine Expander (IMAGE) Purdue University Caption Purdue University researchers created a turbomachine expander that offers an efficient and safe strategy for heating and cooling. Credit Riley Barta/Purdue University Usage Restrictions None License Licensed 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.