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Energies 2020, 13, 6163 8 of 18 The thermal efficiency of the ORC system is Ξ·ORC and is calculated by the net power of the ORC and the endothermic reaction through the evaporator as in the Equation (24). Ξ· = WORC (24) Qeva 3.3. Analytical Model of the Evaporator Heat Exchanger Energies 2020, 13, x FOR PEER REVIEW A heat exchanger model for the evaporator was constructed to calculate the mass flow rate required by the heat source according to the mass flow rate of the working fluid of the ORC power generation system and the inlet temperature of the heat source (stack coolant) side. The plate heat and the endothermic reaction through the evaporator as in the Equation (24). ORC . π=πβπ (23) ππ πΆ ππ₯π ππ exchanger used in the experiment in Jeongβs study was used as a reference for the shape information of the respective evaporator and is shown in Table 3. [17]. The basic geometric characteristics of the The thermal efficiency of the ORC system is Ξ·ORC and is calculated by the net power of the ORC chevron plate heat exchanger are shown in Figure 4. Table 3. Operating parameters of the chevron plate heat exchanger. πΌπΆπΉπͺ = πΎπΆπΉπͺ Μ (24) 8 of 18 Parameters πΈπππ Effective width of plate, Lh Values 0.111 Unit [m] [m] [m] [m] Vertical distance between ports, Lv 3.3. Analytical Model of the Evaporator Heat Exchanger 0.466 0.0004 0.007 Plate thickness, t Chevron configuration pitch, Ξ»p AheatexchangerPmlaotedcehalnfnoelrgtahp,egevaporatorwascon0.s0t0r2uctedto[mca]lculatethemassflowrate Flow channel hydraulic diameter, D required by the heat source according to the mass flow rate of the working fluid of the ORC power 0.003389 [m] Effective heat transfer area, Ahx 0.06105 [m2] generation system and the inlet temperature of the heat source (stack coolant) side. The plate heat Plate chevron angle, Ξ² 35 [β¦] Plate thermal conductivity, k 15 [w/m-K] exchanger used in the experiment in Jeongβs study was used as a reference for the shape Surface enlargement factor, Ο 1.18 - information of the respective evaporator and is shown in Table 3. [17]. The basic geometric Working fluid channel number, Nwf 21 - Heat source channel number, N 22 - characteristics of the chevron plate heat exchanhgser are shown in Figure 4. h Figure 4. Basic geometric characteristics of chevron plate heat exchanger. Figure 4. Basic geometric characteristics of chevron plate heat exchanger. Table 3. Operating parameters of the chevron plate heat exchanger. Parameters Values Unit Effective width of plate, Lh 0.111 [m] Vertical distance between ports, L 0.466 [m]PDF Image | Combined Power Generation System Based on HT-PEMFC and ORC
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