Study on heat and mass transfer of a planar membrane humidifier for PEM fuel cell

Yan, Wei‐Mon; Lee, Chung-Yuan; Li, Chun-Han; Li, Wen-Ken; Rashidi, Saman

doi:10.1016/j.ijheatmasstransfer.2020.119538

Cited by 25 publications

(13 citation statements)

References 30 publications

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“…In which, C represents the total concentration vapor, and D eff shows the effective diffusivity of the vapor in the air. The effective diffusivity in the porous membrane with a porosity of ε was computed using the Bruggeman correction 25,28 :

D^{eff} = ε^{1.5} D

…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Besides, D 0 exhibits the standard diffusivity coefficient. The following relation was applied to evaluate the vapor diffusivity 26,29 :

D_{m}^{H_{2} normalO} = ({, \begin{array}{l} 3.1 \times 10^{- 7} λ ((), e^{0.28 λ} - 1) . e^{(- 2346 / T)} for 0 < λ \leq 3 \\ 4.17 \times 10^{- 8} λ ((), 1 + 161 e^{- λ}) . e^{(- 2346 / T)} otherwise \end{array})

where λ denotes the moisture in the membrane and computed as follow 25,30 :

λ = ({, \begin{array}{l} 0.043 + 17.81 a - 39.85 a^{2} + 36 a^{3} for 0 < a \leq 1 \\ 14 + 1.4 ((), a - 1) for 1 < a \leq 3 \\ 16.8 for a > 3 \end{array})

in which a is the vapor activity and can be computed as:

a = \frac{C^{H_{2} normalO} italicRT}{p_{sat}}

…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The membrane's moisture was computed using the following relation 25,26 :

C_{m}^{H_{2} normalO} = \frac{{italicλρ}_{m, dry}}{W_{m, dry}}

where ρ m,dry and W m,dry denote the density and equivalent weight of dry membrane, respectively.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Hence, a well‐designed humidifier could notably improve the amount of the recovered water, and consequently, the performance of the fuel cell stack is optimized. In our recent publications, 25,26 a mathematical model was introduced based on computational fluid dynamics for PMH simulation with gas‐to‐gas membranes. The model was tested and validated against the literature data, and an excellent agreement was found.…”

Section: Introductionmentioning

confidence: 99%

“…Yan et al 25 utilized the conventional direct gas‐to‐gas membrane humidifiers, and they examined the influence of various control parameters such as the inlet temperature and mass flow rates on the heat and mass transfer behavior of the PMH. Later, Yan et al 26 surveyed the effect of the aspect ratio (AR) of the flow passage channels (width/height) and channel lengths on the PMH's pressure drop, WRR, and coefficient of performance (COP).…”

Section: Introductionmentioning

confidence: 99%

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A novel geometrical design of gas‐to‐gas planar membrane humidifier for proton electrolyte membrane fuel cells

Wang

Lee

et al. 2021

Int J Energy Res

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Summary A gas‐to‐gas membrane humidifier recovers heat and water from the wet hot exhaust gas of a proton electrolyte membrane fuel cell and keeps the inlet feed air of the cell warm and humid. This type of humidifier does not need external water sources, and it is compact and efficient with practical applications in portable devices and automobiles. In the present study, four potential designs of gas‐to‐gas planar membrane humidifiers were introduced, and their characteristic behavior was examined. The simulation results showed that the geometrical design of the humidifier channels could notably influence the efficiency of the device. It was found that a three‐inlet serpentine humidifier could provide the largest water recovery ratio and the heat transfer rate among the proposed designs, with a slight increase in the pressure drop. Hence, the three‐inlet design was selected as the optimal geometrical design of the humidifier. Then, the impacts of design parameters on the characteristic behavior of the three‐channel model were explored. The results show an increase in the outlet (wet side) temperature and relative humidity enhances the water recovery and efficiency of the humidifier. The outcomes of the present research are of practical interest for the design of novel commercial humidifiers.

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