Numerical Simulation Of Internal Flow Field And Optimization Design Based On Mesh Deformation In Air Conditioning Indoor Unit

With the development of social economy and the improvement of people’s living standards,wall-mounted air conditioners have been seen everywhere in households,and often during summer and winter,the use rate of air conditioners will rise sharply,so the problem of air conditioning energy consumption and the thermal environment of air-conditioned rooms The comfort problem have attracted more and more people’s attention.The indoor unit structure of the wall-mounted air conditioner plays a decisive role in the air conditioning performance.Therefore,the improvement of the air conditioning performance has an important significance by optimizing the internal structure of the air conditioner indoor unit and the simulation of the internal flow field.In this paper,the computational fluid dynamics technology is used to simulate the internal flow field of air-conditioning indoor unit.Then,combined with fluid mechanics technology,mesh deformation technology and multi-objective optimization design technology,the internal structure of air-conditioning indoor unit is optimized.The following aspects of the research are carried out in this paper(1)A two-dimensional simulation physical model of air-conditioning indoor unit is constructed firstly,and then the initial pressure and velocity distributions are obtained;(2)To improve the performance of the air conditioner,using mesh deformation technology and multi-objective optimization The technology transforms the three important parts of the heat exchanger,the impeller and the deflector inside the air-conditioner indoor unit,and obtains the optimal structure within the variation range.The research results show that:(1)Mesh deformation and optimization design of heat exchanger.As far as the heat exchanger is concerned,in the case where the initial value is set to 1 cm and the variation range is 0.97 to 1.04 cm,the minimum value of static pressure after deformation optimization is-107 Pa,which is larger than the minimum static pressure before optimization.At 13 Pa,the maximum value of static pressure is 8.5 Pa,which is 11.5 Pa less than before,the minimum value of total pressure is-93 Pa,which is 12 Pa higher than before,and the maximum value of total pressure is 28 Pa,which is 17 Pa less than before.(2)Mesh deformation and optimization design of the impeller.For the impeller,when the initial value is set to 1cm and the variation range is 0.96-1.04cm,the minimum value of static pressure after deformation optimization is-101Pa,which is 19Pa higher than that before optimization,and the maximum static pressure.The value of 14Pa is 6Pa less than before,the minimum value of the total pressure is-93Pa,which is 12Pa higher than before,and the maximum value of the total pressure is 31 Pa,which is 14Pa less than before.(3)Mesh deformation and optimization design of the deflector.For the baffle,when the initial value is set to 1cm and the variation range is 0.9～1.1cm,the optimal target variance is optimally 0.498,and the optimized variance is reduced by about 0.1 compared with the variance calculated before the optimization.This study provides theoretical guidance for the optimization design of subsequent air conditioning indoor units.