Study On Simulation Analysis Of Direct Evaporative Solar Ejector Cooling System

With increasing energy consumption and air pollution in the World Wide, energy and environmental problems have aroused Wide public concern. Ta Ke many factors into consideration, development and utilization of solar energy is the most effective Way to solve energy and environmental issues, based on energy-saving and environmentally-friendly, solar ejector cooling system has become a hot spot.This paper studies the direct evaporative solar ejector cooling system by the method of combination of numerical simulation and experiment. The system obviates the traditional solar refrigeration system generator, the refrigerant evaporates in the collector directly generator, not only provide po Wer for the ejector, also reduces the intermediate heat transfer equipment. With ejector instead of traditional compressor, the system structure is simple and lo W maintenance costs.First direct evaporative solar ejector cooling system are analyzed in thermodynamics, respectively the solar collector generator, ejector, evaporator, condenser, expansion valve and circulating pump mathematical model are established and the solar collector generator and ejector are carried out design calculations. Again based on the theory of phase transitions in the solar is 800W/m2, inlet velocity 0.047m/s, outlet pressure of 2.65 MPa, numerical simulation of the collector generator, phase transition of the refrigerant pipe case, respectively get the tube containing gas rate trends and the Wall temperature, temperature changes on different pipe section. Based on the Kinetic theory of gases in the event of temperature of 80℃, evaporation temperature of 5℃, condensing temperature of 36℃, for dimensions designed to determine the structural parameters of the ejector. Obtained by numerical simulation of fluid inside the jet velocity, pressure, temperature variation, the simulation sho Ws that the mixing chamber and the nozzle outlet section of the cylindrical section has a shoc K Wave, causing dips Where speed, pressure and temperature jump,and analysis the effects of structural parameters and operating parameters of ejector cooling system, the simulation results sho W that the Wor King pressure of 2.65 MPa, evaporation temperature 5℃, condensing temperature 36℃, the injector nozzle distance of 0mm, the mixing chamber diameter cylindrical section ejector performance 10 mm preferably, injection coefficient can reach 0.32 and the COP 0.36.Finally, based on R134 a to build a direct evaporative ejector cooling system experiment bench, and installed temperature and pressure sensors, combined With data acquisition systems and automated test systems.