Performance investigation on the ultrasonic atomization liquid desiccant regeneration system

Yang, Zili; Zhang, Kaisheng; Hwang, Yunho; Lian, Zhiwei

doi:10.1016/j.apenergy.2016.03.008

Cited by 56 publications

(33 citation statements)

References 23 publications

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“…Wang et al [57] presented an experimental study on the performance of a counter flow liquid desiccant dehumidifier. Other improvements such as the cooling/heating approaches [58][59][60], multi-stage structures [61,62], systems with membrane [63][64][65][66] and ultrasonic atomization system [67,68] have all been employed into the LDDS fields these years.…”

Section: Improvement Of System Structurementioning

confidence: 99%

Modeling and control of dehumidifier in distributed operating liquid desiccant dehumidification system

Wu¹

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Liquid Desiccant Dehumidification System (LDDS) achieves low humidity level with relatively low energy consumption, which is an outstanding alternative to conventional airconditioning system in removing the moisture in the air. In industrial or commercial buildings, dehumidifiers of LDDS are usually located at different floors in a distributed manner, while the heat source utilized for regeneration such as the waste heat or solar energy are in the plant room or on the rooftop in a centralized form. Conventional LDDSs regulate the solution concentration in the dehumidifier by continuously exchanging the desiccant solution between dehumidifier and regenerator, which limits LDDS to a one dehumidifier vs. one regenerator arrangement. To take full advantage of the building recourses, a scheme of multiple dehumidifiers working with one regenerator is more efficient. Meanwhile, new technical issues have been raised together with this mechanism, such as detecting and maintaining solution concentration and the solution transfer among the components of a system with multiple terminals. Therefore, this thesis tries to provide some deep discussions on the questions generated from the distributed operating manner to further popularize LDDS in building application. The major contributions are as follows: A buffer integrated dehumidifier has been proposed to realize the distributed operation, and new mathematical model has been developed and validated to describe the dynamic profiles of the dehumidification and concentration variation process during the system operating, including the moisture absorption, strong solution charging, solution mixing, circulating and excavating. A concentration regulation strategy has been developed to control the working solution concentration in the dehumidifier. Model-based soft-sensors are designed to detect the working solution concentrations of dehumidifier and regenerator to provide the concentration information of the two towers for the regulation strategy. Experimental studies on an actual system have been carried out to further verify the efficiency of this concentration regulation strategy with the assistance of the soft-sensors.

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Section: Improvement Of System Structurementioning

confidence: 99%

Modeling and control of dehumidifier in distributed operating liquid desiccant dehumidification system

Wu¹

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“…Besides that, ultrasonic atomization technology was also utilized in the liquid desiccant regenerator in [41,42] where the desiccant solution was atomized into tiny droplets with diameters as small as 50μm. The application of this technology in the regeneration system was able to lower the regeneration temperature to around 45-64 o C and reduce the energy consumption.…”

Section: Regeneration System In Lddsmentioning

confidence: 99%

“…The regeneration performance of different types of regeneration systems has been researched in several literature. Moisture removal rate [5,34,46,47] and concentration increase of desiccant solution [41,48] were the most common performance indices used to determine the performance of the regeneration system. Furthermore, the desiccant solution regeneration process involved the removal of water component in the desiccant solution, therefore volume change of solution in the regenerator tank was also one of the indices used in reference [48].…”

Section: Performance Investigation Of Regeneration Systemsmentioning

confidence: 99%

“…Besides that, reference [41] introduced an Ideal Regeneration Model (IRM) to predict the performance of the developed ultrasonic atomization desiccant regenerator.…”

Section: Performance Investigation Of Regeneration Systemsmentioning

confidence: 99%

“…Therefore, it is important to know the difference of solution mass fraction before and after the regeneration process. The MFI has been used in several literature [41,48] as the regeneration performance index and it can be where ̇ is the vapor generation rate, ̇ℎ is the heating power supplied to the generator, ̇ is the cooling power at the condenser, ℎ , and ℎ , are the inlet and outlet of solution enthalpy respectively, ℎ is the enthalpy of the vapor generated, ̇ is the condensation rate of the vapor and ℎ is the latent heat of condensation.…”

Section: Mass Fraction Increase (Mfi)mentioning

confidence: 99%

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System design and modeling of energy efficient liquid desiccant regeneration system at vacuum condition

Yon¹

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Desiccant solutions, membrane technologies, and regeneration techniques in liquid desiccant air conditioning system

2021

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Liquid desiccant air dehumidification has gained substantial attention recently due to its attractive energy-saving capability, high moisture retention, and low regeneration temperature. However, there are still unresolved limitations in liquid desiccant air conditioning systems (LDACs). Among on-going studies are the search for greener desiccant solvents, high-performance membrane, and regeneration techniques hybridization. This review discusses up-to-date development of the performance influential components of LDACs, such as desiccant properties, regeneration techniques, membranes, energy sources, and hybrid system configurations. The corrosive nature of conventional halide salt solutions, non-biodegradability and high viscosity property of most ionic liquids necessitate the search for alternative solvents in LDACs. Deep eutectic solvents (DES) properties, such as non-corrosive, hygroscopic, biodegradable, and low viscosity idealize promising alternative desiccant solutions. Therefore, DES may be usefully explored and further investigated in LDACs to establish the degree of their capacities in replacing conventional desiccants. Non-thermal regeneration techniques and nanoparticle enhanced membranes were also found to improve the overall energy performance of the LDAC system. Nonthermal regeneration techniques can operate below 40 C and reduce energy utilization between 10% and 50% in indoor space cooling. The coefficient of performance (COP) of this regeneration category is capable of being as high as 6, which is an indication of its promising energy-saving propensity. Highlights• Review on liquid desiccant materials and the potential of deep eutectic solvents as bio-desiccants for air dehumidification.

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Performance investigation on the ultrasonic atomization liquid desiccant regeneration system

Cited by 56 publications

References 23 publications

Modeling and control of dehumidifier in distributed operating liquid desiccant dehumidification system

Modeling and control of dehumidifier in distributed operating liquid desiccant dehumidification system

System design and modeling of energy efficient liquid desiccant regeneration system at vacuum condition

Desiccant solutions, membrane technologies, and regeneration techniques in liquid desiccant air conditioning system

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