Absorption chillers can use waste heat, solar heat, or excess heat by cogeneration facilities to supply chilled water. Therefore, absorption chillers are important components for polygeneration, which can improve plant utilization and efficiency of the overall energy supply system.Currently, 27 new small and medium-scale 1 absorption chillers with high efficiency in fulland part-load as well as low specific size and weight are the focus of two research projects sponsored by German Federal Ministries. The chillers are located in 20 different sites, four of them in Jordan and the rest in Germany. The main objective of these projects is to enhance trigeneration and solar cooling system efficiency.

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