Research On Air Cooling And Spray Composite Cooling Technology Of Condenser Under Cooling Load Of Multi-line System

Today,our country is in the development background of "carbon peak" and "carbon neutrality".It becomes particularly impor tant to optimize engineering technology to promote energy conservat ion and develop a low-carbon economy! The traditional multi-conne cted air-conditioning system has high energy consumption and is ea sily affected by the high temperature external environment.At the s ame time,it affects the thermal environment of the urban underlyin g surface and aggravates the urban heat island effect.In this paper,the air-cooled condenser in the multi-line system is transformed wit h air-cooling and spray composite cooling technology.This method can not only greatly improve the heat exchange efficiency of the c ondenser and the energy efficiency ratio of the multi-line air conditi oning system,but also solve the problem of extreme high temperat ure external environment.The cooling effect of the condenser is po or,and the exhaust air temperature of the condenser is reduced,wh ich alleviates the urban heat island effect to a certain extent.This paper mainly combines numerical simulation,response surf ace method and experimental verification method to design the opti mal structural parameters of the air-cooled and spray composite coo ling type condenser,and study its operation performance.The main research contents are as follows:(1)The heat and mass exchange process of the composite cool ing type condenser is divided into two-phase heat exchange area an d three-phase heat exchange area,and the empirical formula of heat and mass exchange,convective heat transfer process and heat trans fer coefficient calculation are theoretically analyzed.;(2)For the main structural factors that affect the atomization e ffect: the distance between the nozzle and the condenser tube,the opening angle of the atomizing nozzle,and the number of nozzle p oints,the response surface analysis method is used to output the op timal level combination of each structural parameter;(3)Based on numerical simulation calculation,the factors such as nozzle flow rate,nozzle water pressure,nozzle water temperature,inlet air temperature,and inlet air speed that affect the performanc e of the composite cooling condenser are combined with the simula tion analysis software Tecplot and CFD-post analyze one by one;(4)Set up an experimental system to compare and study the p erformance of the air-cooled condenser multi-line system and the co mpound-cooled condenser multi-line system under different external environments.Under the critical high temperature ambient field tem perature,Power consumption drops up to 10% at 75% partial load,which can save 0.25-0.30 kw·h;the comprehensive partial performa nce coefficient(IPLV)is improved by 12.4%.