The Modeling And Dynamic Simulation Of The Liquid Desiccant Dehumidification System

Liquid desiccant dehumidification system which has the advantages of energy conservationand environment protection, is one of the most widely studied dehumidification device. Thestudies were concentrated on the heat and mass transfer process in the dehumidifier/regenerator,the influence of operation parameters and structure parameters to the dehumidificationperformance during the previous research. How the disturbances influence the performance of thesystem and how to adjust the parameters to satisfy the system performance are still unknown. Thispaper carried out the following studies:First of all, according to the conservation of mass, conservation of energy, heat and masstransfer relations, dynamic mathematical models of the main parts of the liquid desiccantdehumidification system were established by the method of modular modeling.And then, according to the relationships of all parameters among the components of thesystem, dynamic simulation models were established in Matlab/Simulink platform. Bycomparing with the experimental results, concluded that the simulation models were available.Thirdly, studied how the disturbances, which include the import air flow rate ofdehumidifier/regenerator, heat source temperature and flow rate, cold source temperature and flowrate, affected the performance of liquid desiccant dehumidification system. Studies have shownthat the simulation model could be not only applied in terms of study the effect of disturbance onsystem performance, also could provide research platform for adjust the parameters.Finally, this paper tried to design a controller of plate heat exchanger, which was a base to thenext work.