Analysis On Latent Heat Recovery Type Ejector Refrigeration System And Numerical Simulation Of Ejector

With the energy crisis and the increasingly serious environmental pollution, energy conservation has become a common responsibility all over the world. Each year, the shipping industry has consumed large amount of energy. According to improve energy efficiency and reduce environmental pollution, the scholars from various countries put their interest on the ship waste heat utilization.Compared with the commonly used compression refrigeration system, ejector refrigeration system has advantages of a simple structure, no moving parts, able to use the ship waste heat. Therefore, this thesis presents the latent heat recovery type ejector refrigeration system with ship waste heat as the system heat source to re-use of ship waste heat. This thesis analyses the system performance.Compared with traditional ejector refrigeration system, the new system adds a supercharger ejector between the condenser and the main ejector to recovering the latent heat of the gas which is not condensed inside the condensation. This thesis completed the new system thermal calculation, discussed the conditions of latent heat recovery type ejector refrigeration system COP better than traditional jet refrigeration system COP. This thesis completed the research and analysis of two different types ejector refrigeration system performance under the same working conditions with six species refrigerants, such as R11, R12, R123, R134a, R600a and water. This thesis selected the water as the system refrigerant, analyzed the system performance in variable conditions and studied the superior operating range of the latent heat recovery type ejector refrigeration system.Ejector is the core part in the refrigeration system, it does a great influence on the performance of the system. Based on Sokolov aerodynamic function method, the thesis designed an ejector with90℃working fluid,10℃second fluid,30℃condensing temperature, determined the structure size. This thesis used the Fluent software to simulate the main ejector of the internal flow conditions. This thesis completed research on analysis of the working fluid parameters, second fluid parameters, ejector outlet backpressure and structural parameters affecting the working performance of the ejectors by the numerical simulations.