Ratio And The Gas-liquid Separation Simulation And Its Experimental Study Of Non-azeotropic Mixed Refrigerants

Non-azeotropic mixtures automatic cascade refrigeration system is based on the different boiling temperature of the different working fluids, step by step through the inner separation cascade to get bigger and get a lower temperature refrigeration section. In this paper, automatic cascade system mixture selection and matching simulation optimization and experimental study of the different working fluids are distributed to impact on the system of separation of refrigerant condensing effect and a different ratio.Firstly, what a comprehensive conventional non-azeotropic refrigerant automatic cascade programming selection principle come to different conditions feasibility of working pairs list; and according to the principles of heat transfer and vapor-liquid equilibrium of balance, it determines to work pair the ratio method, which provides a reference for the selection of auto-cascade system of working pairs and ratio. To obtain-110℃it chooses the ratio determined using the methods described herein, calculates theoretically-110℃automatic cascade system used refrigerant for R410a/R23/R14and R22/R23/R14ratio (R22/R23/R14ratio of8:6:6; R410a/R23/R14ratio is7:6:6), to ensure the best separation R14, thereby increasing the system COP and cooling capacity of the system. But for R410a, which is azeotropic refrigerant, when the presence of condensate is incomplete, the composition has changed, but it will not cause the system to reach the desired effect, for an experimental verification of its feasibility.Then, we use different methods of simulation to deal with automatic cascade refrigeration system to separate the effects of different evaporation temperature of the working fluid and the ratio of-110℃, the selected maximum separation rate is corresponding to their proportion of the working fluid: the first use of condensation temperature of the refrigerant R22and R410a to simulation by Fluent, under the same mass flow rate, the better the selected condensation temperature of the refrigerant; reusing molecular dynamics simulation under high-temperature refrigerant to provide adequate cooling, the temperature of the refrigerant different temperature distribution and movement of molecules when the ratio of low-temperature refrigerant R23and R14, R23and binding in accordance with the principle of diffusion density R14final separation rate is calculatedFinally, in the automatic cascade refrigeration system minimum entropy production basis of theoretical analysis, building an experimental device system, it’s the simulation results experiments that to prove the correctness builds a simulation model. And the experimental verification of the results of the experimental system built optimized. That is based on the minimum evaporation temperature of the system reached to adjust the type of lubricant system, throttle, filters, etc.