26 March 2004
An oil-free reciprocating compressor has been built and tested for operation with carbon dioxide at supercritical pressures and temperatures. The tests indicated good performance, including quiet operation. This is one of the results from a now concluded project within the IEA Heat Pump Programme, intended to advance the technology of using carbon dioxide as a refrigerant by tackling both fundamental and practical problems. This article describes the results from the various sub-projects.