Transcription of Describing a fuel cell’s performance and efficiency
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Describing a fuel cell’s performance and efficiency
Describing a fuel cell s performance and efficiencyBasic energy conversion of a fuel cell was described as:Chemical energy of fuel = Electrical energy + Heat energyHydrogenFuel CellHydrogenEnergy = ?Electricity Energy = V I tHeat (byproduct)OxygenEnergy = ?Water (byproduct)The input energy is that produced during reactions at the this section we will describe the above energy balance in more detail usinggygthe first and second laws of thermodynamics . performance (cont.)The performance of a fuel cell is governed by its Polarization performanceThis type of performance curve showsthe DC voltage delivered at the cellterminals as a function of the currentpdensity (current per unit area of membrane)being drawn by the external curve and the losses associatedThis curve and the losses associated with its shape will be discussed later.(ref. 1)One measure of the energy conversion efficiencyof a fuel cell is the ratioof the actual voltage at a given current density to the maximum voltageobtained under no load (open circuit) Analysis: 1stLawControl VolumeEElectrolyteFuelOxidant-E+E1stLaw for a control volume: E = Q W where E = KE + PE + U + (PV) = HFor a fuel cell, the work is obtained from the transport of electrons acrossttildifftbhilh t i f=> H = Q - Wa potential difference.
Thermodynamic Analysis: 2 nd Law Will consider the fuel cell to be ideal for now, meaning that it is reversible and thus behaves as a …
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