Absorption and Adsorption Thermodynamic Processes (1)

Monday August 26, 2019 from 15:30 to 17:10

Room: 518ab

TS-119 .4 Performance analysis of different ternary NH3-H2O-salt absorption heat pump cycle combined with electrodialysis technique

Mengkai Xu, People's Republic of China

doctor student
School of energy and environment
Southeast University

Abstract

Performance analysis of different ternary NH3-H2O-salt absorption heat pump cycle combined with electrodialysis technique

Mengkai XU1, Shuhong LI1, Kai DU1.

1Southeast University, School of energy and environment, Nanjing, People's Republic of China

LiBr, LiNO3 and NaOH are three widely used additions that can significantly improve the performance of ammonia absorption heat pump cycle. To compare the enhancements of using different additions, Aspen plus process monitor is applied to simulate the performance of ternary NH3-H2O-salt absorption heat pump. The results indicate LiBr heighten the performance most, 16.52% higher than ternary cycle. However, the existence of additions has an adverse effect on absorption process because it decreases the absorption capacity of the ternary working fluid. To avoid the negative effect, electrodialysis technique is employed to separate additions from absorber to generator. The new models of NH3-H2O-salt absorption heat pump combined with electrodialysis device are established and simulated in Aspen plus process monitor. The results show that, LiBr can increase the COP of new absorption heat pump cycle up to 12.36%, highest in the three additions compared with traditional cycle.

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