Proposal of an eco-friendly high-performance air-conditioning system. Part 1. Possibility of improving existing air-conditioning system by an evapo-transpiration condenser

Huynh Thi Minh Thu, Haruki Sato

Research output: Contribution to journalArticle

9 Citations (Scopus)


Air-conditioning (AC) system consumes high energy and releases waste-heat. In the present study, we propose a method to improve its performance and minimize waste-heat by replacing existing air-cooled condenser by an evaporation and transpiration, evapo-transpiration, condenser. The improvement is confirmed by performing experiment for a conventional air-cooled AC system and a water-cooled AC system. Condenser temperature in the air-cooled system is higher than outdoor-temperature by 5-10 C, while it is -5 to 5 C in case of the testing system. From simulation results, saving energy consumption is expected to reach up to 30% in summer with the testing system. Based on these results, an evapo-transpiration heat-exchanger was developed as a new condenser. Heat-transfer coefficient of the testing heat-exchanger is at least 4 times higher than that of air-cooled condenser. Even hot fluid is used inside copper-tubing, its outlet-air temperature is as nearly as outdoor temperature.

Original languageEnglish
Pages (from-to)1589-1595
Number of pages7
JournalInternational Journal of Refrigeration
Issue number6
Publication statusPublished - 2013 Sep 1



  • Air-conditioning
  • Condenser
  • Energy saving
  • Evapo-transpiration
  • Exergy
  • Heat island

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering

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