Experimental Study on Performance of Two-throat Nozzle Ejector and Two-phase Ejector Refrigeration Cycle System

摘要

The two-phase ejector refrigeration cycle (TPERC) system with a two-throat nozzle ejector was investigated experimentally, and the entrainment ratio of the ejector and the COP of the system were compared with those of the ejector with Laval nozzle and its TPERC system respectively. The experimental results indicate that under the working condition of the evaporating/condensing temperatures 1°C/45°C, the entrainment ratio of the two-throat nozzle ejector with different geometric size is greater than that of the Laval nozzle ejector, the maximum increment of the entrainment ratio is about 18%, and the COP of the TPERC system with two-throat nozzle ejector is greater than that of the TPERC system with Laval nozzle ejector, the maximum increment of the COP is about 12%. Under the fixed evaporating temperature 1°C, the entrainment ratio of the two-throat nozzle ejector and the Laval nozzle ejector achieve the maximum as the condensing temperature is 45°C. Under the fixed condensing temperature 50°C, the entrainment ratio of the two types of ejectors achieves the maximum as the evaporating temperature is 3°C.