The long-term performance of heat exchangers in air conditioners degrades gradually as the increase of operation duration

which leads to the decline of cooling and heating capacity of air conditioner system. This paper is devoted to present the research status on long-term performance of heat exchangers in air conditioners

and focuses on factors such as dust deposition

corrosion

intermittent operation condition and bio-fouling. Research problems and direction of long-term performance of heat exchangers in air conditioners are pointed out.