Open AccessSimulation research on absorption refrigeration system based on NH3-H2O-LiBr vapor-liquid equilibrium calculation model
Author(s) -
Shan Wang,
Shuhong Li,
Min Xu,
Zhi-jiang Jin,
Chengcheng Xu
Publication year - 2022
Publication title -
thermal science/thermal science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.339
H-Index - 43
eISSN - 2334-7163
pISSN - 0354-9836
DOI - 10.2298/tsci210127201w
Subject(s) - lithium bromide , thermodynamics , absorption refrigerator , refrigeration , ternary operation , vapor pressure , materials science , absorption (acoustics) , equation of state , range (aeronautics) , ternary numeral system , physics , computer science , heat exchanger , composite material , programming language
In order to investigate the ammonia + water + lithium bromide absorption refrigeration cycle process and to simulate it accurately, a vapor-liquid equilibrium calculation model was proposed to obtain thermodynamic characteristic data of the ternary mixtures. The calculation of parameters of liquid phase is based on Wilson?s equation and NRTL equation. The vapor phase, assumed to consist of ammonia and water only, is described by The Redlich-Kwong Equation of State. The data of the equilibrium vapor pressure and the ammonia concentration in liquid phase calculated by this model was compared with the experimental data, the difference is between 0.5% to 9.6% within the temperature range from303 K to 425 K. The COP obtained by the simulation matches with that obtained by experiment and the absolute deviation is less than 0.02. Therefore, this calculation model can be used for simulation to extend the temperature range and pressure range of the system, so as to determine the design parameters of the absorption refrigeration system. The simulation results indicates that under different working conditions, the optimal generator temperature and concentration of adding lithium bromide can be selected, to which the theoretical explanations were given in this paper.