evidence for similarity of performance of compressor

摘要

A method and system for testing a compressor are described. To perform a similitude test, a substitute for HFC-134a is selected. The substitute test gas is used, either in purity or in a mixture with other gases, to test the compressor in accordance with ASME PTC-10 tests. The substitute test gas can, for example, have a molecular weight between 40g/gmol and 150 g/gmol, a global warming potential (GWP) of less than 700, and a gas specific heat ratio of between 1 and 1.5, one of another set of predetermined characteristics, or can be selected from a group including of HFC-245ca (also known as R-245 or by its chemical name 1,1,2,2,3-pentafluoropentane), HFO-1234yf (also known by its chemical name 2,3,3,3-Tetrafluoroprop-1-ene), HFO-1234ZE (also known by its chemical name trans-1,3,3,3-Tetrafluoroprop-1-ene) and DR-11.