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The objective of the present work is to dimension and evaluate an absorption LiBr-H2O cooling system assisted by solar energy and natural gas for air conditioning of a group of housings in Mexicali, Baja California, Mexico. The analysis of the hourly, daily and monthly operating performance in the period with more cooling demand is carried out by mean of TRNSYS 16, and it is seeking the least collection area and the highest solar fraction; that which is translated in the minimum operation cost and initial investment. It was found that the system generates conditions of the space between comfortably warm and comfortably cold, according to ISO 7730 (2005), with 287 m² of evacuated tubes which contribute 90% of the required energy. The system is technically feasible, since it covers the cooling demand during the summer period and it requires a similar collecting area to the available one in the housing compounds. [ABSTRACT FROM AUTHOR]

The performance of integrated solar collectors with glass cover is compared with the flat solar collectors (employing pumping and thermosyphon circulation) in the climate of four sites in Cuba. The same system for each solar collector is simulated by the program TRNSYS: A domestic hot water system. The integrated solar collectors with two glasses allow a sustancial improvement in solar systems working at low temperatures. Their performance is equal as those of thermosyphon and flat plate collectors. Their characteristics allow to build competitive integrated solar collector installations for domestic hot water in Cuba. [ABSTRACT FROM AUTHOR]