The research on the feasibility of LiBr-NH_3-H_2O absorption system

The feasibility of absorption refrigeration with LiBr-NH_3-H_2O ternary system as refrigerants was explored by using low grade heat in synthesis ammonia installation as heat resource. The coefficient of performance was determined. The results show that the addition of lithium bromide in ammonia-water binary system can lower the system pressure and in-crease the COP effectively. The maximum COP value can reach 0.32 when LiBr concentra-tion is 30% and ammonia concentration is 50%, and top COP can increase to 0.44 after decreasing the amount of chilled water. The average COP of ternary system is more than bi-nary system about 35%. This result approves the promising application and extension of Li-Br-NH_3-H_2 O ternary system for recovery of industrial waste heat.