Experimental comparison of two solar-driven air-cooled LiBr/H2O absorption chillers: Indirect versus direct air-cooled system Articles uri icon

publication date

  • July 2013

start page

  • 323

end page

  • 334


  • 62

International Standard Serial Number (ISSN)

  • 0378-7788

Electronic International Standard Serial Number (EISSN)

  • 1872-6178


  • Experiments were run to compare an indirectly air-cooled commercial absorption chiller to a directly air-cooled absorption chiller prototype. Both were 4.5-kW, 1-m3, single-effect LiBr-H₂O chillers. The trials were conducted at outdoor dry bulb temperatures ranging from 28 to 37 degrees C. The maximum allowable generator inlet temperature in the commercial chiller (to prevent salt crystallisation) was 105 degrees C, while in the prototype it was 120 degrees C. The commercial chiller delivered chilled water at 18 degrees C and the prototype at 16 C. The mean daily COPth was 0.55 in the commercial chiller, compared to 0.62 in the prototype. The mean daily COPelec for the chiller and prototype was 3.5 and 5.3, respectively. The mean daily SCOP for the solar-powered air conditioning facility was around 0.08 in both cases.


  • absorption; libr/h₂o; solar cooling; experimental; directly air-cooled; indirectly air-cooled