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Membrane-electrode assemblies (MEAs) in proton exchange membrane fuel cells provide the electrochemical reactions at electrodes, the permeation of fuel and/or oxidant gas and the drainage of water product. The formulation of catalyst slurry and preparation procedure significantly cause different structures of catalyst and ionomer binder which inflence the performance of MEAs. In addition, the properties of the solvent system in catalyst inks also play an important role in determining the electrode structure in MEA. In this study, we have varied the solvent systems, and then investigated their electrochemical properties in terms of durability and mass transfer overpotential. <sup>**</sup>This work was supported by the Korea Institute of Energy Technology Evaluation and Planning(KETEP) and the Ministry of Trade, Industry & Energy(MOTIE) of the Republic of Korea (No. 20153010031920).
This paper proposes diffusion bonding characteristics of a heat exchanger whose material is Inconel. In order to respond to high temperature and pressure operating conditions, the diffusion bonding technology and Inconel 617 material were applied to the heat exchanger. However, it is difficult to estimate how well the diffusion-bonded Inconel heat exchanger is made. In this paper, the bonding performance for the diffusion-bonded heat exchanger was examined and analyzed. The analysis with measuring thermal and mechanical properties such as thermal diffusivity and tensile strength were conducted and parametric studies about bonding temperature and pressing force were carried out. The bonding condition of 1200oC, 50 ton was found to be suitable for this heat exchanger. Through thermal resistance model, impurity management with 10 μm level would be expected to be necessary. Besides pressure-resistant test, the deformation in the stacking direction of the plates was found to be important observation element. The heat exchanger was tested for evaluating its capability where the performance showed 10 kW for capacity and 0.7 for effectiveness at 1.5 kg/min. From the results, we were able to establish the base technology for the manufacture of Inconel 617 heat exchanger through the application of the diffusion bonding.
In this paper, parametric study of wet electrostatic precipitator applied to ducted heat pump system was conducted. For the experiment, a dust collecting module was designed and a prototype was manufactured. The airflow rate, the applied voltages of the charging and collecting part were selected as the main parameters in the limited condition. The dust collection efficiency was measured according to the change of the parameter values and the influence of each parameter was analyzed. As a result, the contribution of each parameter on the dust collection efficiency was analyzed as 22.7% airflow rate, 6.6% applied voltage in charging part and 69.9% applied voltage in collecting part. And it was found that the applied voltage of the dust collecting part had the greatest influence on the dust collection efficiency. The correlation equation was derived using the parameters and the product design was made considering this. This design and analysis process will be helpful in future large-scale design.