摘要
通过吸收式制冷实验,对比研究了溴化锂对于氨水吸收式系统性能的影响,包括浓溶液发生过程气-液相平衡特性和系统性能系数的变化.测定了氨-水-溴化锂三元吸收式系统发生过程中的温度-压力关系,计算了系统的性能系数.温度范围从15℃到80℃,压力达1.5 MPa.实验采用了3组溶液:A(X(NH3)=48%),B(X(NH3)=51.8%,X(LiBr)=42%),C(X(NH3)=58.7%,X(LiBr)=42%).对比发现,溶液B、C的发生压力分别比相同氨含量的二元溶液下降了约21%和30%,且发生温度越高,发生压力降幅就越大.采用溶液A时系统的性能系数为0.242,而采用溶液B、C时性能系数分别为0.293和0.334,分别提高了17.2%和33.6%.因此,在氨水吸收式制冷机中加入溴化锂可以明显提高机组的性能系数.
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（NH3）=48%）,B（X（NH3）=51.8%, X（LiBr）=42%）, and C（X（NHa）=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 NH3 concentration. The pressure reduction increased with the increase of the generation 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.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2009年第3期46-49,69,共5页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(50776064)
关键词
氨-水-溴化锂
气-液相平衡
吸收式系统
性能系数
ammonia-water-lithium bromide
vapor-liquid equilibrium
absorption system
coefficient of performance
