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Energies 2020, 13, x FOR PEER REVIEW 6 of 18 OpencircuiPtaVraomltaegter,sVocv Number of cells, Ncell Values0.95 U[Vn]it 880 300 433 0.4 8.314 3 3 Current density, I cell Current density, I [K] Universal gas constant, R Universal gas constant, R [A/cm2] [J/mol·K] [J/mol·K] Faraday constant, F Faraday constant, F CathodCeastthooicdheiosmtoeictrhyioramtieot,rλy ra[t2io4], λair [24] air 96485.3 [C/mol] h2 - 𝑊 𝜂𝐹𝐶 = 𝐹𝐶 (16) 6 of 18 Energies 2020, 13, 6163 Table 2. Operating parameters and empirical parameters used in the HT-PEMFC model. Table 2. Operating parameters and empirical parameters used in the HT-PEMFC model. Parameters Hydrogen electro-oxidation rate constant, k Hydrogen electro-oxidation rate coehnstant, keh [24] 1.63818 [A/cm2] [24] Low heating Value of hydrogen, LHV 1.63818 0.14212 [A/cm ] Hydrogen surface coverage, θ Low heating Value of hydrogen, LHV [24] Hydrogen surface coverage, θh2 [24] 0.14212 - 𝑁 𝐿𝐻𝑉𝐼𝐴 𝑐𝑒𝑙𝑙 2𝐹 𝑐𝑒𝑙𝑙 Furthermore, the pressure drop on the coolant side of the HT-PEMFC was reflected by the fitting the pressure drop according to the flow rate based on the experimental value. In general, curve fitting the pressure drop according to the flow rate based on the experimental value. In the pressure drop on the coolant side of the stack is dependent on the flow path design of the cooling general, the pressure drop on the coolant side of the stack is dependent on the flow path design of plate, and in this study, the pressure drop test value of the most widely commercialized vehicle stack 239.92 [kJ/mol] [kJ/mol] Values Unit Open circuit Voltage, Vocv NumbSerinogflceecllesl,lNactive area, Acell 0.95 880 300 433 0.4 8.314 96485.3 - cell Single cell active area, A [cm- 2] Operating tempecrelal ture, Tcell Operating temperature, T [cm2] 239.92 [V] [K] [A/cm2] [C/mol] - 2 ThTehtehethrmeramlaplopwoewregregnenraetreadtedbybtyhethHeTH-PTE-PMEFMCFCwawsasssaussmuemdetdotboebheehate-aetx-echxcahnagnegdewdiwthitthethe cocoolaonlatnbtybtyhethDeiDttuitstu-Bs-oBeoltelrteErqEuqautiaotnio(n17(1),7a),nadntdhethheehaetagtegnenraetreadtebdybayuaxuilxiailriyardyedveicveicsessuscuhcahsatshethe cocoolionlginpgupmupmwpawsaigsnigonreodre.d. Nu = 0.023Re0.8Pr0.4 (17) 𝑁𝑢 = 0.023𝑅𝑒0.8𝑃𝑟0.4 (17) Furthermore, the pressure drop on the coolant side of the HT-PEMFC was reflected by the curve the cooling plate, and in this study, the pressure drop test value of the most widely commercialized with a level similar to the reaction area was applied to the model. vehicle stack with a level similar to the reaction area was applied to the model. ∆P = 4074+1.86×106Q6 +3.184×109Q9 2 2 ((18)) ΔF𝑃C = 4074 + 1.86 × 10F𝑄C + 3.184 × 10FC𝑄 𝐹𝐶 𝐹𝐶 𝐹𝐶 As a cooling pump model used to transport Triethylene glycol (TEG), which is a stack coolant, As a cooling pump model used to transport Triethylene glycol (TEG), which is a stack coolant, a commercial pump for cooling of a maximum 100 kW stack that has a performance curve as shown a commercial pump for cooling of a maximum 100 kW stack that has a performance curve as shown in in Figure 2 was applied [25]. Figure 2 was applied [25]. Figure 2. The performance curve of the cooling pump. Figure 2. The performance curve of the cooling pump. 3.2. Thermodynamic Model of ORC Figure 3 shows the T-s diagram of the ideal ORC cycle and conceptually shows each state and system. In Figure 3, the movement from point 12 to point 9 refers to the section in which the liquidPDF Image | Combined Power Generation System Based on HT-PEMFC and ORC
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