Abstract:

The characteristics of flow-versus-condensing pressure in electronic expansion valve（EEV）with R410A，a new environment-friendly refrigerant as working fluid were experimentally investigated.The tests of flow characteristics with changing condensing pressure were performed under different given running conditions，including inlet temperatures，subcoolings and evaporating pressures.The test results were compared and analyzed，and a new feature when choking occurred was found.Flow choking was triggered by the increase of condensing pressure and the decrease of back pressure，and the choking characteristics resulting from condensing and evaporating pressure respectively were identical.The flow characteristics with changing condensing pressure were analyzed and summarized according to the tests so as to provide the flow characteristics of EEV for the matching design and running characteristics study of the refrigeration system.