Physical properties measurement and performance comparison of membranes for planar membrane humidifiers

Chen, Chen-Yu; Chang, Yu‐Hsuan; Li, Chun-Han; Chang, Chih-Chang; Yan, Wei‐Mon

doi:10.1016/j.ijheatmasstransfer.2019.03.027

Cited by 27 publications

(4 citation statements)

References 41 publications

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“…In recent years, porous membranes with good WVP comparable to the Nafion membranes have attracted the attention of scholars and are listed in Table . − It is obvious that water vapor migrates faster in the pores of porous membranes than it dissolves and diffuses in dense membranes. However, these works are not suitable for humidifying the reaction gas with the exhaust gas of fuel cells, which only can be fit for liquid water and the reaction gas in the humidifier.…”

Section: Introductionmentioning

confidence: 99%

PEBAX 3533/PAA/CNC Composite Fiber Membranes as the Humidifier Membrane for Proton Exchange Membrane Fuel Cells

Abi

Chang

2022

Ind. Eng. Chem. Res.

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A new type of humidification membrane for proton exchange membrane fuel cells composed of polyether-block polyamide (PEBAX) 3533, polyacrylic acid (PAA), and cellulose nanocrystals (CNCs) was fabricated using the electrospinning method. CNCs were used to improve the hydrophilicity of the membrane, and PAA was used to improve the spinnability of the material. Using a scanning electron microscope, the morphology of PEBAX/PAA/CNC composite fiber membranes (CFMs) and electrospun fibers was investigated. Through X-ray diffraction analysis and the tests of water vapor permeability, air permeability, and water contact angles, the effects of CNCs on membrane properties were investigated. The results showed that the addition of CNCs improved the hydrophilicity and crystallinity of the CFM; while the air barrier properties of the CFM improved, the water vapor permeability coefficient of the membranes decreased. When the content of CNCs was 4.8 wt %, the vapor/air selectivity reached the highest value of (2.20 ± 0.05) × 10 4 , which was 14% more than that of the fiber membrane without CNCs.

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Section: Introductionmentioning

confidence: 99%

PEBAX 3533/PAA/CNC Composite Fiber Membranes as the Humidifier Membrane for Proton Exchange Membrane Fuel Cells

Abi

Chang

2022

Ind. Eng. Chem. Res.

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“…40−43 In 2020, it has also been used as an efficient sample introduction unit for a soft ionization source. 44 It should be noted that MUN is an ultracheap (<$1) and easily available device and it can continuously convert the solution into aerosols based on the cavitation effect without peristaltic pumps or compressed gas. All of these characteristics imply that MUN has great potential to be applied as the sample introduction device for microplasma sources to facilitate the miniaturization of the whole system.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Ultrasonic nebulization (USN) has been proposed as an attractive alternative to PN for highly efficient aqueous sample introduction. , Recently, miniaturized ultrasonic nebulization (MUN) has received increasing attention and obtained various applications even in daily life, including humidifiers. − In 2020, it has also been used as an efficient sample introduction unit for a soft ionization source . It should be noted that MUN is an ultracheap (<$1) and easily available device and it can continuously convert the solution into aerosols based on the cavitation effect without peristaltic pumps or compressed gas.…”

Section: Introductionmentioning

confidence: 99%

Development of a Portable Method for Serum Lithium Measurement Based on Low-Cost Miniaturized Ultrasonic Nebulization Coupled with Atmospheric-Pressure Air-Sustained Discharge

et al. 2021

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An accurate, rapid but cheap, and portable method for monitoring of serum lithium (Li) is highly desirable for mental patients who take Li medicine for treatment. Conventional techniques are usually bulky, costly, and cannot provide on-site real-time measurements. Herein, a miniaturized, reliable, costeffective, and portable optical emission method for rapid and sensitive determination of serum Li was developed based on a combination of miniaturized ultrasonic nebulization (MUN) and a low-power (≈22 W) atmospheric-pressure air-sustained discharge (APAD) excitation source. The proposed method eliminates the use of any compressed gas or pump and can achieve serum Li detection within 40 s with low sample consumption (less than 20 μL serum). Except for dilution with water, no extra treatment is needed for serum Li analysis by MUN-APAD-OES. In addition, it offers a significant advantage of good tolerance to the coexisting high concentration of Na, K, Ca, and Mg, which is in contrast with the obvious matrix effect encountered in conventional inductively coupled plasma optical emission spectrometry (ICP-OES). Different operating parameters affecting the performance of MUN-APAD-OES were evaluated. Under optimized conditions, the detection limit of Li (670.8 nm) was calculated to be 0.6 μg L −1 (6 μg L −1 in serum). Finally, the accuracy of the proposed method was validated by the analysis of two certified reference materials (Seronorm serum L-1 and L-2 RUO), six real human serum samples, and eight real animal serum samples. All of the results indicate that the low-cost and low-power MUN-APAD-OES provides a promising reliable method for on-site serum Li measurement and may also be extended to other elements.

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“…Membrane humidification can be divided into two types according to the structure of the membrane used: Tubular and plate humidifiers [14,15]. Membrane humidifier uses organic polymer membrane, which can only allow water molecules to pass through.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Humidification Performance of Fuel Cell Test Platform Humidifier

Wang

Zhou

et al. 2019

Energies

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Temperature and humidity are important parameters in the operation of proton exchange membrane fuel cell (PEMFC), which have an important impact on the performance of fuel cell. Fuel cell test platform is an important tool to study the performance of fuel cells, and its temperature and humidity control module is also the key in the research process of the test platform, so that it can provide the gas with precise temperature and humidity control during the test process of the fuel cell. In this paper, a humidifier combined with bubbling and spraying is adopted for the application of test platform, and the numerical simulation model of the humidifier is established. According to the model, the influence of operating conditions of humidifier on humidification performance is verified, such as inlet air velocity and the humidifying water temperature. The results indicate that the inlet air velocity and the humidifying water temperature have great influence on the humidifying performance of the humidifier. The humidifying performance decreases with the increase of the inlet air velocity and increases with the increase of the humidifying water temperature respectively. In addition, the humidification performance of the humidifier is verified.

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Physical properties measurement and performance comparison of membranes for planar membrane humidifiers

Cited by 27 publications

References 41 publications

PEBAX 3533/PAA/CNC Composite Fiber Membranes as the Humidifier Membrane for Proton Exchange Membrane Fuel Cells

PEBAX 3533/PAA/CNC Composite Fiber Membranes as the Humidifier Membrane for Proton Exchange Membrane Fuel Cells

Development of a Portable Method for Serum Lithium Measurement Based on Low-Cost Miniaturized Ultrasonic Nebulization Coupled with Atmospheric-Pressure Air-Sustained Discharge

Numerical Study on Humidification Performance of Fuel Cell Test Platform Humidifier

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