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Energies 2020, 13, x FOR PEER REVIEW Energies 2020, 13, 6163 12 of 18 12 of 18 (a) (b) FFigiguurree77..ORCsystemperformanceccurrveeaacccoorrddininggtotoRR24254f5afammasasssfloflwowrartae.te(.a)(Ea)leEcltericctrpicowpoewr;e(br;) (bE)vEapvoarpaotroartoarndancdoncodnednesenrsehrehaetattratrnasnfesrferartaet;e(;c()c)MMasassflfloowwrraatteeoffTri-ethyleneglycol((TEG))ththaatt ssaatitsisfifeiessssuuppeerrhheeaatt55KKininththeeeevvaappooraratotor.r. 4.3. Effect of Stack Inlet Temperature in the Combined System 4.3. Effect of Stack Inlet Temperature in the Combined System (c) In order to analyze the combined system that merged the HT-PEMFC subsystem and the ORC In order to analyze the combined system that merged the HT-PEMFC subsystem and the ORC subsystem, the transport pump controlled the mass flow rate so that the temperature difference at the subsystem, the transport pump controlled the mass flow rate so that the temperature difference at inlet and outlet of the stack was 5 K. The mass flow rate was controlled through a 3-way valve so that the inlet and outlet of the stack was 5 K. The mass flow rate was controlled through a 3-way valve all thermal power generated from the stack was exchanged with the evaporator of the ORC subsystem. so that all thermal power generated from the stack was exchanged with the evaporator of the ORC The system performance was compared and analyzed after the inlet temperature conditions of the subsystem. The system performance was compared and analyzed after the inlet temperature stack were selected as 433 K, 443 K, 453 K, and 463 K, and the current densities of the stack were conditions of the stack were selected as 433 K, 443 K, 453 K, and 463 K, and the current densities of 0.15 A/cm2, 0.2 A/cm2, 0.25 A/cm2, 0.3 A/cm2, 0.35 A/cm2 and 0.4 A/cm2. the stack were 0.15 A/cm2, 0.2 A/cm2, 0.25 A/cm2, 0.3 A/cm2, 0.35 A/cm2 and 0.4 A/cm2. As shown in Figure 8a, the mass flow rate of the cooling pump that satisfies the temperature As shown in Figure 8a, the mass flow rate of the cooling pump that satisfies the temperature difference between the inlet and outlet of the stack as 5 K is proportional to the current density. As the difference between the inlet and outlet of the stack as 5 K is proportional to the current density. As thermal power of the stack increased as shown in Figure 9d, the required convective heat transfer the thermal power of the stack increased as shown in Figure 9d, the required convective heat coefficient also increased, resulting in an increase in the mass flow rate that satisfied the operating transfer coefficient also increased, resulting in an increase in the mass flow rate that satisfied the conditions. As the inlet temperature of the stack increased, the physical properties of TEG changed, operating conditions. As the inlet temperature of the stack increased, the physical properties of TEG which influenced the formation of the mass flow rate of the cooling pump. The mass flow rate at the changed, which influenced the formation of the mass flow rate of the cooling pump. The mass flow evaporator heat source (TEG) side of the ORC subsystem increased as the current density increased, rate at the evaporator heat source (TEG) side of the ORC subsystem increased as the current density but it decreased as the inlet temperature of the stack increased. The results of the mass flow rate of the increased, but it decreased as the inlet temperature of the stack increased. The results of the mass cooling pump and the mass flow rate of the evaporator’s heat source (TEG) according to the operating flow rate of the cooling pump and the mass flow rate of the evaporator’s heat source (TEG) conditions, as well as the pressure drop of the stack and the pressure drop of the evaporator are shown according to the operating conditions, as well as the pressure drop of the stack and the pressure in Figure 8c,d, respectively. drop of the evaporator are shown in Figure 8 c,d, respectively.PDF Image | Combined Power Generation System Based on HT-PEMFC and ORC
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