DETERMINING VAPOR PRESENCE AT EXPANSION VALVES INLET BY AN IMPEDANCE SENSOR
An experimental study of the refrigerant vapor presence at expansion valves inlet is proposed in this work. An impedance sensor was developed for determining the void fraction aiming at to produce an electrical signal for a refrigerant mass flow control system in a regular refrigeration mechanical compression cycle. A discussion of the experimental technique, procedure as well as the main causes of vapor presence at expansion valves inlet, and its consequences, is analysed in this study. Experimental facility of 5.0 kW mechanical compression refrigeration cycle using the alternative refrigerant R417A are presented, and the influence of mass flow trough a thermostatic expansion valve (TXV) and an electronically controlled expansion valve (EEV), with and without vapor presence is discussed. As a goal, the work aims at to furnish a possible new tool for improving the cycle control system.
M.S.ROCHA J.R.SIM(O)ES-MOREIRA
Escola Politécnica - Universidade de Sao Paulo Mechanical Engineering Department, SISEA – Alternative Energy Systems Laboratory Av. Prof. Mello Moraes, 2231, 05508-900, Sao Paulo, SP, Brazil
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）