Performance study of the internally-cooled ultrasonic atomization liquid desiccant dehumidification system

Yang, Zili; Tao, Ruiyang; Hui, Ni; Zhong, Ke; Lian, Zhiwei

doi:10.1016/j.energy.2019.03.114

Cited by 21 publications

(9 citation statements)

References 28 publications

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“…5b, the effect of membrane composition induced variations in both air and soluble concentration along the length of the channel [29]. Accordingly, air concentration decreased by increasing the airflow through the membrane surface, while the solution concentration increased, indicating the transfer of moisture from the air to liquid [30]. Figure 6a shows that the impact of solvent type and porosity of the membranes varied due to the presence of DMF or NMP with different weight percentages on the porosity of the membranes.…”

Section: Simulation Resultsmentioning

confidence: 96%

Performance optimization of polymeric porous membrane-based liquid desiccant air dehumidifier used in air conditioning system

Jafarpour

Fazelpour

Mousavi

2019

Int J Energy Environ Eng

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In this study an experimental design was developed to optimize the performance and structure of a membrane-based parallelplate 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.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Section: Simulation Resultsmentioning

confidence: 96%

Performance optimization of polymeric porous membrane-based liquid desiccant air dehumidifier used in air conditioning system

Jafarpour

Fazelpour

Mousavi

2019

Int J Energy Environ Eng

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“…The model’s governing equations, 20 namely the mass (equation (10)), energy (equation (11)) and sensible heat balance (equation (12)) equations, are as follows …”

Section: Methodsmentioning

confidence: 99%

“…Detailed information on assessing the differential enthalpy of dilution Δ h d , and the enthalpies of the airstream and the desiccant solution h a,i , h a,o , h l,i , h l,o , have been reported. 20,25…”

Section: Methodsmentioning

confidence: 99%

“…Further details for the solving process have been reported. 20 However, before the model can be utilized, experimental validation is required and was carried out.…”

Section: Methodsmentioning

confidence: 99%

“…More recently, a new internal-cooled liquid desiccant dehumidification system (IC-UADS) equipped with ultrasonic atomizers, in which the desiccant solution is atomized into tiny droplets with promoted heat and mass transfer, was studied by Yang et al. 20 Apart from the performance improvement from the adiabatic system, IC-UADS was reported, as it can meet various dehumidification loads by the flexible and precise adjustment of the desiccant flow rates and cooling water flow rates. Besides, the humid air can be dehumidified to different target humidity levels through regulating the desiccant concentration.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Determination of cost-efficient cooling power range for improving the performance of internally cooled ultrasonic atomization liquid desiccant dehumidifiers

Yang

Chen

Tao

et al. 2020

Indoor and Built Environment

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Liquid desiccant dehumidifiers (LDDs) can be improved by adding internal cooling. However, the addition of excessive cooling power may deteriorate the system‘s cost-efficiency, whereas the addition of insufficient cooling power leads to negligible performance improvements. The objective of this study is to determine the suitable cost-efficient cooling power range for improving the performance of internally cooled LDDs (IC-LDDs). A novel method and a set of criteria related to the moisture removal rate, cooling-power efficiency ( ηc) and coefficient of dehumidification performance from cooling power ( DCOPcooling) were proposed to determine cost-efficient cooling power. The internally cooled ultrasonic atomization liquid desiccant system (IC-UADS), together with a well-validated model based on the conservation laws of mass and energy and the sensible heat balance, was adopted to demonstrate the analysis. The results showed that, although the dehumidification performance improves with increasing cooling power, the improvement rate decreases, while ηcand DCOPcoolingdecline quickly (by 87.9%). For cost-efficient improvement, the necessary power proportion of internal cooling to the system‘s target dehumidification capacity tends to be stable, which was about 29% for the IC-UADS, and independent of the operating conditions. The results may help to determine the reasonable cooling power range for cost-efficient improvement of IC-LDDs.

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Optimal flow type in internally-cooled liquid-desiccant system driven by heat pump: Component level vs. System level

Guan

Liu

Zhang

et al. 2021

Applied Thermal Engineering

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Performance study of the internally-cooled ultrasonic atomization liquid desiccant dehumidification system

Cited by 21 publications

References 28 publications

Performance optimization of polymeric porous membrane-based liquid desiccant air dehumidifier used in air conditioning system

Performance optimization of polymeric porous membrane-based liquid desiccant air dehumidifier used in air conditioning system

Determination of cost-efficient cooling power range for improving the performance of internally cooled ultrasonic atomization liquid desiccant dehumidifiers

Optimal flow type in internally-cooled liquid-desiccant system driven by heat pump: Component level vs. System level

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