Experimental Study on Flow Characteristics of the Electronic Expansion Valve with Variable Condition

In this paper a series experiments and theory studies were conducted on electronic expansion valves, the relationship of refrigerant current capacity and variable condition under the condition of invariable other parameters was explored. Refrigerant mass flow rate is unceasingly increasing with Subcooled degree increases, and reducing with the evaporating temperature rises ceaselessly, increasing with the condensing temperature elevates, as well as increasing with the number of pulse increases.For the same type (DPF1.4) electronic expansion valve, Between 100 pulse count and 270 pulse count, refrigerant mass flow rate with reverse connecting pipe (i.e. shaft in and side out), is higher than refrigerant mass flow rate with positive connecting pipe (i.e. side in and shaft out), and pulse count of reverse takeover is almost pulse count minus 20 of positive takeover. Between 270 pulse count and 440 pulse count, refrigerant mass flow rate with reverse takeover is lower than refrigerant mass flow rate with positive takeover.