Retrofit assessment of window air conditioner

Tun Ping Teng*, Huai En Mo, Hung Lin, Yuan Hong Tseng, Ren Hao Liu, Yu Fan Long

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


This study investigates the feasibility of replacing R22 window air conditioners with hydrocarbon refrigerants (propane, R290) for various charged masses (25-70%), and analyzes the performance at different outside air temperatures (26, 29, 32 °C). Results indicate that the optimal charged mass for refilling a window air-conditioning unit with R290 refrigerant is approximately 50-55% of the R22 refrigerant at different outside air temperatures. In addition, a comparison of R22 and R290 refrigerants shows that the EER of the R290 refrigerant exhibits an upward trend as the outside air temperature increases, improving the EER by approximately 20% under ideal conditions. The refrigerant in most window air conditioners can be changed from R22 to R290, and the ODP and GWP of R290 are negligible comparable with those of R22 refrigerant. Replacing R22 window air conditioners with R290 can effectively enhance EER values and reduce carbon emissions.

Original languageEnglish
Pages (from-to)100-107
Number of pages8
JournalApplied Thermal Engineering
Issue number1
Publication statusPublished - 2012 Jan


  • Charged mass
  • Energy efficiency ratio (EER)
  • Hydrocarbon refrigerant
  • Propane (R290)

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering


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