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Energiies2020,,13,,6x1F63OR PEER REVIEW 10of18 Figure 5. Validation of heat exchanger performance. Figure 5. Validation of heat exchanger performance. The pressure loss on the heat source side of the evaporator heat exchanger is βPeva and is defined and is The pressure loss on the heat source side of the evaporator heat exchanger is Ξπ as the Equation (32) considering only the loss due to friction. ππ£π defined as the Equation (32) considering only the loss due to friction. Lv Nhs G22 βPeva = fhs πΏπ£πhπ πΊ (32) f πhs follows the Darcy friction factor and is expressed as in the Equation (33) [17]. follows the Darcy friction factor and is expressed as in the Equation (33) [17]. hπ 3.4. Performance of the Combined System (HT-PEMFC and ORC) Ξπ =π 2DΟ ππ£π hπ hL (32) β0.045 π = 72.5π πβ0.045 (33) f hπ = 72.5Re πΏ hs L (33) 3.4. Performance of the Combined System (HT-PEMFC and ORC) The total electric power produced by the combined system consisting of the HT-PEMFC and ORC The total electric power produced by the combined system consisting of the HT-PEMFC and is expressed as the sum of the power generated by the HT-PEMFC (WFC), the power consumed by ORC is expressed as the sum of the power generated by the HT-PEMFC (ππΉπΆ), the power consumed the cooling pump for the HT-PEMFC (Wcp), the power generated through ORC (Wexp), and the power by the cooling pump for the HT-PEMFC (πππ), the power generated through ORC (πππ₯π), and the consumed by the refrigerant pump (Wrp) as shown in the Equation (34). power consumed by the refrigerant pump (πππ) as shown in the Equation (34). Wπ ==Wπ βWπ +Wπ βWπ (3(344)) tπ‘oπtπ‘aπlπ FπΉCπΆ cπpπ eπxπ₯pπ rπpπ In addition, the power efficiency of the combined system is expressed as the ratio of the total In addition, the power efficiency of the combined system is expressed as the ratio of the total power of the combined system according to the LHV of HT-PEMFC, as shown in the Equation (35). power of the combined system according to the LHV of HT-PEMFC, as shown in the Equation (35). π 2π·h ππΏ ππ π¦π π‘ππ = Wπ‘ππ‘ππ πΏtπ»otπal (35) Ξ·system = πππππLHV πΌπ΄ππππ (35) Ncell 2πΉIAcell 2F The whole system is analyzed using the commercial program Flomaster based on the law of The whole system is analyzed using the commercial program Flomaster based on the law of conservation of energy (36), the law of conservation of mass (37), and the law of conservation of conservation of energy (36), the law of conservation of mass (37), and the law of conservation of τ²τ±.τ± τ².Μ τ²τ±.τ± τ².Μ in species (38). species (38). β(πΜh) +βπ =β(πΜh) +βπ (36) mh ππ+ Qππ= mh ππ’π‘+ Qππ’π‘ (36) in τ²τ±m.τ± =τ²τ±m.τ± τ²τ±m.xτ± =τ²τ±m.xτ± out out iπnπ oπuπ’t π‘ (37) β(πΜ) =β(πΜ) (37) in out (38) (38) β(πΜ π₯)ππ = β(πΜπ₯)ππ’π‘PDF Image | Combined Power Generation System Based on HT-PEMFC and ORC
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