Performance evaluation of packed tower liquid desiccant dehumidifier based on LSSVM

Abstract

In this paper, an empirical model based on least square support vector machine (LSSVM) method to predict the output air conditions in a packed tower liquid desiccant dehumidifier is developed. By analysis of the coupled heat and mass transfer between the process air and desiccant solution, six variables are used as the inputs of the LSSVM model, namely: desiccant solution and air flow rates, desiccant solution and air inlet temperature, desiccant concentration, and air relative humidity. Meanwhile, outlet air temperature and relative humidity related with the performance of the dehumidifier are considered as the outputs of the LSSVM model. Compared with the existing theoretical models, the present one is very simple, yet accuracy, and does not need complex theoretical analysis. The experimental results illustrate the effectiveness of the proposed model on performance predicting in a packed tower liquid desiccant dehumidifier. This developed model is expected to have widely applications in performance evaluation, operational monitoring, fault detection and diagnosis.

Optimization of Liquid Desiccant Regenerator with Multiobject Particle Swarm Optimization Algorithm

“…The research on air dehumidification by LDDSs may trace back to 1955 when Lof first designed an open-cycle air-conditioning system using triethylene glycol as a liquid desiccant. Since then, numerous papers have reported contributions to the system design of the LDDS, − experimental investigation, − performance analysis, − and coupled heat mass transfer model development. , Li et al presented both single-stage and double-stage photovoltaic-electrodialysisa (PV-ED) regeneration systems to further explore the energy saving potential of LDDSs, and the comparison results showed that the double-stage system was more energy efficient with more than 50% energy saving . The performance of an electrodialysis (ED) regenerator was experimentally studied to obtain the effects of different flow rates of desiccant solution on the current utilization and mass transfer rate on unit area of the anion-exchange membrane regenerator .…”