الفهرس 
AbstractOnly 14 pages are availabe for public view
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Abstract
The world is now living in an energy crisis. Refrigeration and air conditioning system have become the basics of daily life in various fields and can’t be dispensed. Refrigeration machines and air conditioning systems are the most energy-consuming, whether the application is domestic, commercial, industrial or medical. Therefore, using cooling systems which are powered by thermal energy, e.g., solar energy, can save a lot of electrical energy. Absorption refrigeration system is an example of a refrigeration system powered by heat energy, but the problem of this system is that it has a low coefficient of performance (COP). The objective of this research is to improve the COP of Ammonia absorption cycles by improving the absorption of the refrigerant Ammonia in the Ammonia-water solution in the absorber unit. The absorption efficiency is improved by using (1) a stirrer pump to improve mixing, (2) sprayers to increase the contact area between the ammonia and the ammonia-water solution and (3) the continuous cooling of the solution during the absorption process via an external heat exchanger. As a result of that the COP of the ammonia absorption cycle has increased from 0.48 to 0.715, i.e., by 49%. This is due to the improvement of the absorption of the ammonia into the ammonia–water solution.