This proceedings book discusses developments in air, gas and refrigeration compressors, vacuum pumps, and expanders. It is the 14h edition of the International Conference on Compressors and their Systems, a three-day conference organized by the Centre for Compressors Technology at City St George&s, University of London supported by, among others, IMechE, IIR, and IOR. The International Conference on Compressors and their Systems series began in 1999 as a result of industrial consultation and need for academic collaboration. At the time, the conference was organized by the Fluid Machinery Group of the Institution of Mechanical Engineers (IMechE) with support from Holroyd. From 2009, the Centre for Compressor Technology at City, University of London, took over its management and the conference is now one of the main conventions, taking place biennially in the UK, becoming world-renowned for its place in industry and academia to gather and discuss a broad range of topical issues related to compressors and compression systems. The theme of this conference is "Emerging Technologies in Compressors and their Systems".