Performance study on the dehumidifier of a packed bed liquid desiccant system

作者：Salarian H^*; Ghorbani B; Amidpour M; Salehi G

来源：Scientia Iranica, 2014, 21(1): 222-228.

• Liquid desiccant system
• Absorber
• Experimental model
• Dehumidifier efficiency
• Mass transfer coefficient
• OPtiMuin ASMR

A liquid desiccant evaporation cooling air conditioning system is introduced in this paper, in which the dehumidifier and regenerator play the most important role. For liquid-gas contact, packed towers with a low pressure drop provide good heat and mass transfer characteristics for compact designs. The experimental data have been obtained from a built prototype of a liquid desiccant system in a packed bed unit with a surface area per unit volume ratio of 125 m(2)/m(3); the liquid desiccant being lithium chloride. The result showed that the mean mass transfer coefficient of the packing dehumidifier was 0.02 kg/m(2)s. Also, the absorber characteristic parameter, the packing size or Number of Transfer Units (NTU) and Air-to-desiccant Solution Mass flow Rate ratio (ASMR) are crucial parameters. These parameters, which affect humidity effectiveness and enthalpy efficiency, are introduced and defined in this paper, and high efficiency may be achieved if proper values of these variables are selected. In this study, enthalpy efficiency from experimental results has been compared with analytical computation results based on optimum ASMR. From the analytical solution, an optimum mass flow rate ratio can be deduced for optimal design of both dehumidifiers and regenerators. In this study, the behavior of the absorber has also been considered.

• 出版日期2014-2