Experimental Constructing And Study On The Ejector Refrigeration System

With the improvement of the standard of living, air-conditioner has been more and more popularized. At the same time, mechanical compression refrigerators consume a big quantity of electric power and indirectly make the pollution problem severe, which bring forward a great challenge to the human's sustainable development. Among the various solutions, the utilization of solar energy and other regenerative energy for refrigeration is one of the promising choices. Because of its ability to utilize the low-temperature thermal energy resources, and its simple structure and reliable operation, the ejector refrigeration system has gained much attention.In the experiment of thermal engineering, when testing the capability of an experimental system, people usually measure the data from the apparatus and turn them into temperature value, pressure value etc., then estimate the running condition and adjust it. This method's efficiency is low, and errors caused by human-factor may occur easily. With the development of industrial control and computer technology, the method of applying combined data acquisition and computer technology is used more and more.In this paper the computer data acquisition technology is used to build the experiment of ejector refrigeration system, the ejector refrigeration system's capability is studied. The following are the main contents and conclusions:(1) Based on the mathematic model of ejector and refrigeration system, the system and ejector's performance analyzing and structure designing are achieved.(2) An experimental ejector refrigeration system is built. The computer data acquisition system with temperature and pressure sensors is built, which achieves the experiment's automatic testing. A special data acquisition software is compiled by Visual Basic 6.0. The software containing the functions of controlling DAQ card, data processing, drawing real-time curve and database inquiry has high practicability.(3) The experimental system is ran with refrigerant. The results show that when the running condition is generator temperature T_g=83～85℃, the condenser temperature T_c=28～30 ℃, and the evaporator temperature T_e=12～16℃, the refrigeration system can run steadily, the COP can achieve 0.2 and the cooling capacity can achieve 0.24kW.