Design And Optimization Of Vertical Gas-Liquid Separator For A Chiller

Gas-liquid separator is one of the most important accessories to ensure the safety and reliable operation of the refrigerant system,which is widely used in the chiller.According to the different operating conditions,a different structure and dimension of the gas-liquid separator will have different effect on the overall operation of the chiller.Therefore,an optimization design of the gas-liquid separator has important practical significance.In this paper,a gas-liquid separator of a certain type chiller was studied,including its structure,modal,flow and noise.(1)By referring to the relevant literature,the geometry dimension parameters of the gas-liquid separator such as volume,diameter and height,were deduced according to the operating parameters of the unit and its refrigerant charge.(2)Under the rated operating condition,the structural stress analysis was carried out by numerical method and analytical method respectively.Then the force condition of the head is obtained,the comparable results show that the numerical method is more suitable for the stress calculation of the gas liquid separator.(3)By the numerical simulation method,the flow inside the liquid separator was studied under the rated operating condition,and obtained the distribution of the pressure,velocity and frequency sound.-The analysis on the simulation results show that the setting of oil return hole is reasonable,and position of the aerodynamic noise is mainly located at the bottom of the gas-liquid separator.(4)By the finite element method,the shell of gas-liquid separator was simulated under the condition of compressor,and obtained the natural frequency of the separator and the dynamic response curve.(5)The influence of the outer casing tube length,the casing pipe of the oil return hole diameter on the pressure drop between the inlet and outlet of the separator-was studied by using the orthogonal experimental design method.The results show that the largest pressure drop occurred when the outer tube height is 450 mm and the pipe diameter ratio is 2.73.