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wt weight X mole fraction yr year Greek Letter Symbols: α road angle of incline α electron transfer coefficient β hydrogen utilization ε motor efficiency γ interfacial surface tension γ oxidant utilization δ diffusion layer thickness η thermal efficiency ηact activation polarization ηconc concentration polarization ηohm ohmic polarization θ electrolyte contact angle θCO CO coverage k air density Subscripts: a c e f i in out ox p t anode cathode electrolyte fuel species cell inlet cell outlet oxygen or oxidant pressure temperature 10.5 Fuel Cell Related Codes and Standards 10.5.1 Introduction The rapid development and application of fuel cells throughout the world has created the need for fuel cell technology related codes and standards. Several organizations and committees are currently working on the development of codes and standards related to fuel cells. According to the National Fire Protection Agency (NFPA) Regulations Governing Committee Projects, codes and standards are defined as follows: Code: A standard that is an extensive compilation of provisions covering broad subject matter or that is suitable for adoption into law independently of other codes and standards. 10-14PDF Image | Fuel Cell Handbook (Seventh Edition)
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