Improving the performance of ammonia-water absorption cycles using salt additives and membranes
Date of Original Version
This paper proposes a new design of an ammonia-water absorption refrigeration cycle for low-temperature heat sources such as solar energy and waste heat. The proposed cycle uses a salt additive to shift the chemical equilibrium toward more effective separation of ammonia molecules from aqueous solution (i.e., salting out). Since salt additives can affect all aspects of the absorption cycle, membranes have been chosen to control the flow of ions in the cycle and limit their effects to the generation side. This paper describes an absorption cycle that uses membrane separation processes, such as reverse osmosis, dialysis, and electrodialysis. To optimize the performance of the cycle, however, the membranes and salts must be carefully chosen.
Ibrahim, Osama M., Stanley M. Barnett, and Vinnay G. Balamuru. "Improving the performance of ammonia-water absorption cycles using salt additives and membranes." ASHRAE Transactions 103, 1 (1997): 439-443. https://digitalcommons.uri.edu/che_facpubs/77