Absorption refrigeration experiment was conducted to find the influences of lithium bromide on the performance of an absorption system with ammonia-water working pair

including variation of vapor-liquid equilibrium property and coefficient of performance(COP)of the system. The relationship between temperature and pressure of the ternary ammonia-water-lithium bromide solution in generation process and COP of the system were determined in the range of 15-80 ℃ and up to 1.5 MPa. Three types of solutions

A(X(NH

3

)=48%)

B(X(NH

3

)=51.8%

X(LiBr)=42%)

and C(X(NH

3

)=58.7%

X(LiBr)=42%)

were adopted in the experiment. The results showed that the generation pressure of the solutions B and C decreased by 21% and 30%

respectively

compared with that of the binary solution with the same NH

3

concentration. The pressure reduction increased with the increase of the generat

ion temperature. In addition

the COP of the system with B and C was 0.293 and 0.334

17.2% and 33.6% greater than that with A

respectively.