Abstract
In this study an experimental design was developed to optimize the performance and structure of a membrane-based parallel-plate liquid desiccant dehumidifier used in air conditioning regeneration system which operates under high humidity weather conditions. We conducted a series of polymeric porous membranes with different compositions fabricated that were prepared with various weight percentages of polysulfone (PSU), mixed with N-methyl-2-pyrrolidone (NMP) and dimethyl form amide (DMF) solvents. Furthermore, the designed experiments were performed under various operating conditions, indicating that the dehumidification efficiency declines with increasing flow rate, temperature, and humidity. Consequently, a membrane with optimized porosity and moisture permeability was selected which resulted in eliminating the carryover of solution droplets in the air, largely due to separating the flow condition of liquid desiccant (Li Cl) and air. This specific design is also greatly benefited by removing the water vapor from the air stream. The results of mathematical model simulations indicate that the DMF solvent had higher dehumidification capability compared with that of NMP under the optimized operating conditions. Additionally, it can clarify the porosity of the membrane which plays a significant role in the overall performance. Therefore, the fabricated membrane produces fresh cool air, and it can be applied as a guiding sample for designing the membrane-based dehumidifier with improved performance.
Highlights
Growth in the world’s population and economy, coupled with rapid urbanization, will result in a substantial increase in energy demand over the coming years, a vast part of which is significantly attributed to the energy consumed by buildings for air conditioning [1]
Increasing attention has been paid to membranebased technology due to the fact that air dehumidification plays an important role in improving air quality and maintaining thermal comfort
Membrane-based air dehumidification has been applied in ventilation and air conditioning
Summary
Growth in the world’s population and economy, coupled with rapid urbanization, will result in a substantial increase in energy demand over the coming years, a vast part of which is significantly attributed to the energy consumed by buildings for air conditioning [1]. The desired energy for such a demanding requirement, in humid climates, is provided by burning fossil fuels whose consumption leads to serious energy and environmental problems [2]. Paying less attention to control measures that reduce fossil fuel consumption could result in human health hazards, discomfort, and productivity decline of human beings [3]. One factor that is important to be considered is the climatic parameter such as relative humidity. It appears that effective control of humidity stands as a critical matter for maintaining a healthy indoor environment and reducing energy consumptions [4]
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