Heat and mass transfer coefficients based on decoupling characteristics of heat and mass transfer between liquid desiccant and air(II) Experiments and application of new method
Experiments for the liquid desiccant dehumidification process with a cross flow structured packed dehumidifier were performed.Based on the Le-hD separative evaluation method,mass transfer coefficients were obtained according to the experimental results.The effects of the temperature,flow rate and humidity ratio of inlet air,the temperature and mass concentration of inlet desiccant solution on mass transfer coefficients were analyzed.The correlations of mass transfer coefficients and Lewis number were established.Additional 74 groups of experiments validated the correlations.The calculated values were compared with the experimental values and it was found that the differences of air outlet humidity,temperature and solution outlet temperature between calculated and experimental results were respectively less than 10%,6%,12%.The results illustrated that the Le-hD separative evaluation method was quite acceptable and the correlations of mass transfer coefficients were accurate for packed tower designing or simulation of thermodynamic performance.