In this paper

the air conditioning system of Suzhou Du Shu Lake gymnasium was retrofited. In consideration of the characteristics of the gymnasium

a magnetic levitation centrifugal unit & a gas vacuum hot water boiler was adopted to replace the original direct-fired lithium bromide unit. In addition

the airflow organization was redesigned

original system of the audience area seat air supply

has been changed

low and high position of the stadium air have been exchanged. Thus

the air conditioning effect was improved with problems solved of unit performance attenuation and heat storage of earthwork static box. At the same time

CFD simulation was used to verify the retrofit plan

and the results proved effective. Finally

the project has been completed

tested

and has achieved good results

which provides a reference for similar gymnasium air conditioning retrofit.