A　new　kind　of　expanders,　called　as　single　screw　expander,　has　been　developed　by　our　team　and　applied　to　refrigeration　systems.　The　present　paper　is　to　determine　experimentally　the　refrigeration　performance　of　a　compressed　air　refrigeration　system　which　is　based　on　a　single　screw　expander　with　175　mm　diameter　rotor.　Results　indicate　that　the　single　screw　expander　has　good　refrigeration　performances　with　a　70　degrees　C　odd　temperature　drop　and　an　adiabatic　efficiency　above　65%.　A　high　refrigerating　output　can　be　obtained　at　high　intake　pressure　and　high　rotational　speed.　The　coefficient　of　performance　(COP)　varies　a　little　with　increasing　intake　pressure　at　low　rotational　speed,　but　has　an　obvious　increase　with　increasing　intake　pressure　at　high　rotational　speed;　and　the　higher　the　rotational　speed,　the　higher　the　COP.　The　maximum　COP　of　0.9　can　be　achieved.　This　preliminary　study　shows　that　the　compressed　air　refrigeration　system　based　on　single　screw　expanders　exhibits　good　refrigeration　performances.　(C)　2013　Elsevier　Ltd.　All　rights.　reserved.