It is easy to notice lately, the significant growth that the energy market, which opens the doors to a race for new energy sources and new methods for obtaining the benefit of energy. It is in the same vein as some industrial and research laboratories with an interest environment increasingly growing development of absorption chillers that have many advantages. The absorption refrigeration systems using ammonia-water couple now become a promising solution for cooling due to their many advantages. These systems use greener refrigerants to the environment. They also have the advantage of using a free source of heat and clean by coupling with a solar heat source. The objective of this work is to study a refrigeration loop absorption using the ammonia-water pair purpose of determining its performance and suggest improvements. This improvement in the coefficient of performance "COP" is based on changes to the system to absorption itself. Our approach is to increase the number of boilers and absorbers (three boilers, condenser, evaporator and two absorbers). The modifications brought us the following advantages: the possibility of operating with temperatures vary around 70 °C panels that require less costly simple plans and elimination of the distillation column which is explained by the reduction in the overall cost of the facility with improved COP.