The method and principle replac ing the expansion valve with a vortex tube to enhance the efficiency are present ed. A new kind of piston-cylinder expansion machine appropriate for small capac ity refrigeration application is also introduced.

• 论述了涡流管代替膨胀阀提高系统效率的方法、原理,并介绍了一种适合小型制冷系统的新型气缸活塞式膨胀机。