Transient limiting current measurements for characterization of gas diffusion layers

Göbel, Martin; Kirsch, Sebastian; Schwarze, L:; Schmidt, Lasse; Scholz, Hannes; Haußmann, Jan; Klages, Merle; Scholta, Joachim; Markötter, Henning; Alrwashdeh, Saad S.; Manke, Ingo; Müller, Bernd R.

doi:10.1016/j.jpowsour.2018.09.003

Cited by 30 publications

(14 citation statements)

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“…However, fuel cell transient response has attracted some attention lately, as it can be used to elucidate and deconvolve complex transport phenomena. [3][4][5][6][7][8] Several transient models have also been proposed in the literature. [9][10][11][12][13][14][15] These models usually use simplified reaction kinetics and do not account for the microstructure of various cell layers and the anisotropic material properties.…”

mentioning

confidence: 99%

Through-the-Membrane Transient Phenomena in PEM Fuel Cells: A Modeling Study

Goshtasbi

García-Salaberri

Chen

et al. 2019

J. Electrochem. Soc.

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This paper presents a 2D, fully coupled and comprehensive transient model that accounts for micro-structural features of various cell layers. The model benefits from state of the art sub-models for reaction kinetics and incorporates the polymer relaxation dynamics. Furthermore, a mixed wettability model is utilized to simulate the transient two phase conditions in the porous layers. The model is validated with transient experimental data under various conditions. A comprehensive simulation study is presented to investigate the impact of operating temperature and relative humidity on the transient response. The effects of cathode Pt loading and operation mode, i.e., current control versus voltage control, are also studied. The cell response is found to be dominated by water transport through its thickness. Additionally, it is found that reducing the Pt loading can influence the performance by changing the water balance in the cell, which has rarely been highlighted in the literature. In particular, at low temperature more water is transported toward the anode when the cathode Pt loading is reduced, since the resistance to water back diffusion is lowered with reduced thickness of the cathode catalyst layer. This trend is reversed at a higher temperature due to increased volumetric heat generation with reduced thickness. The model can help in understanding various transport phenomena and is expected to be useful for inspecting spatio-temporal temperature, potential, and species distributions across the cell's thickness and optimizing the cell design and choice of materials.

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mentioning

confidence: 99%

Through-the-Membrane Transient Phenomena in PEM Fuel Cells: A Modeling Study

Goshtasbi

García-Salaberri

Chen

et al. 2019

J. Electrochem. Soc.

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“…Solar energy is one of the most attractive energy sources for heating considering its abundance and widespread availability [6,7]. Over the past decades, a major choice is connected to the usage of heat pump, which enables the use of renewable energy from the environment [8][9][10]. Therefore, a growing interest in photovoltaic/heat pump (PV/HP) systems are considered, which combines PV cells and heat pump systems as shown in figure 1.…”

Section: Introductionmentioning

confidence: 99%

Economic feasibility of heating source conversion of the swimming pools

Al-Falahat¹,

Abu²,

Alrwashdeh³

2022

J Appl Eng Science

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Conversion from conventional heating systems is developed to address the emission of CO2 in the environment, global warming, rising costs, potential shortages of fossil fuels, for all energy source alternatives available. This study reviewed the economic feasibility associated with converting the current heat source to a renewable energy source of heating swimming pools located in Jordan. Many modern heating systems techniques are proposed in this study such as solar heat collectors, heat pump and photovoltaic assisted heat pump. Solar heat collectors are a device that collects and/or concentrate solar radiation from the sun and allow for heating the water. In addition, a growing interest in photovoltaic/heat pump systems is considered, which combines photovoltaic cells and heat pump systems. Hence converting solar energy into electricity and then heat through the heat pump. The Initial and operation cost for all proposed techniques is evaluated. As a result, it is found that the best economical alternative option that can be installed on the available area of the building is photovoltaic with a heat pump system during the heating season. The operation cost of the current source (diesel boiler) is about 179,974 US$ and the total cost of heat solar thermal collector is about 936,540 US$ but the total cost of the proposed photovoltaic/heat pump system is nearly 251,060 US$, which save about 45,134 US$ yearly of the total commercial building electricity bill that is selected with a payback period of fewer than two years. In addition, available space on the rooftop of the selected building is well fitted with photovoltaic panels which are around 2000 m2. This result suggests that utilizing a PV/HP system for hotel pools is advantageous both financially and environmentally.

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“…However, although R-410A is of zero ODP, it has a high GWP, even higher than that of R-134a. The goal of this work concentrates on investigating the performance of a small refrigerator with a drop-in refrigerant R-410A in place of the original refrigerant R-134a to examine the possibility of replacement [7,[10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the effect of using different refrigerant gases on refrigerator performance

Alrwashdeh¹,

Ammari²,

Hammad³

et al. 2022

JJE

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An experimental study of the performance of a refrigerator using two refrigerants R-134a and R-410A has been conducted. The R-134a was the original design refrigerant, while the R-410A was the drop-in refrigerant. The study was performed on a small refrigerator charged with each refrigerant alone at nearly the same ambient conditions. Temperatures at various locations in the refrigeration system were measured using thermocouples during the running of the experiments, and the data collected were processed into performance refrigeration parameters. The results have indicated that both the refrigeration capacity and coefficient of performance were remarkably higher for the refrigerant R-410a by about 23 and 24%, respectively.

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Transient limiting current measurements for characterization of gas diffusion layers

Cited by 30 publications

References 50 publications

Through-the-Membrane Transient Phenomena in PEM Fuel Cells: A Modeling Study

Through-the-Membrane Transient Phenomena in PEM Fuel Cells: A Modeling Study

Economic feasibility of heating source conversion of the swimming pools

Experimental investigation of the effect of using different refrigerant gases on refrigerator performance

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