Performance variations of a solar-powered ejector cooling-system (SECS) using an evacuated-tube collector are presented for Antalya, Aydin, Konya and Urfa cities located in the southern region of Turkey by means of hourly and monthly average ambient temperature and solar radiation meteorological data. A SECS, based on a constant-area ejector flow model and using R-123, was considered. The cooling season and period were taken into account for the 6 months (May-October) and the hours 8:00-17:00, respectively. It was found that the evacuated-tube collector efficiency depending upon the ambient temperature and solar radiation within the day was remarkably varied. However, for all the cities, the cooling capacities of the SECS were very similar. When generator, condenser, and evaporator temperatures were taken, namely, 85 degrees C, 30 degrees C and 12 degrees C, the maximum 2 overall coefficient of performance and the cooling capacity were obtained as 0.197 and 178.26 W/m(2) respectively, at 12:00 in August for Aydin. The evacuated-tube collector area per ton cooling was found to be around 21 m(2) at. noontime in August for all the cities. Furthermore, at the off-design conditions, a performance map of the system was derived and discussed. It was determined that the SECS could be used for office-cooling purposes during the hours (8:00-15:00) in the southern region of Turkey. (c) 2006 Elsevier Ltd. All rights reserved.