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Energies 2020, 13, 6163 16 of 18 Energies 2020, 13, x FOR PEER REVIEW 16 of 18 Figure 11. Difference between system and stack power efficiency with stack inlet temperature and Figure 11. Difference between system and stack power efficiency with stack inlet temperature and condensing temperature. condensing temperature. 5. Conclusions 5. Conclusions In the case of HT-PEMFC, thermal management is formed as important as a relatively high In the case of HT-PEMFC, thermal management is formed as important as a relatively high operating temperature, and in the case of a heat exchange system that utilizes waste heat, since the operating temperature, and in the case of a heat exchange system that utilizes waste heat, since the operating range and strategies taking account of the thermal management of the stack must be selected, operating range and strategies taking account of the thermal management of the stack must be it is necessary to predict the power generation performance and efficiency according to the operating selected, it is necessary to predict the power generation performance and efficiency according to the conditions. In this study, a model for a combined power generation system composed of a HT-PEMFC operating conditions. In this study, a model for a combined power generation system composed of stack and an ORC power generation system was established, and the power generation performance a HT-PEMFC stack and an ORC power generation system was established, and the power and system efficiency were analytically compared according to the stack and ORC operating conditions. generation performance and system efficiency were analytically compared according to the stack Each system was made of a model using the existing research contents and in the case of the plate and ORC operating conditions. Each system was made of a model using the existing research heat exchanger for the Evaporator of the ORC system, which is the most important element for stack contents and in the case of the plate heat exchanger for the Evaporator of the ORC system, which is thermal management and waste heat recovery, reliability was secured by comparing the experimental the most important element for stack thermal management and waste heat recovery, reliability was results and the analysis results of the model. Through the analysis using the final combined power secured by comparing the experimental results and the analysis results of the model. Through the generation system model, the system power generation performance and efficiency were compared analysis using the final combined power generation system model, the system power generation and predicted according to the operating temperature of the stack, the power generation load, and the performance and efficiency were compared and predicted according to the operating temperature ORC system working fluid condensing temperature, and the results are summarized as follows. of the stack, the power generation load, and the ORC system working fluid condensing temperature, and the results are summarized as follows. (1) (1) (2) (2) For the analytical comparative study, modeling of each of the HT-PEMFC stack and ORC combined power generation system was conducted. In particular, in order to secure the reliability of the For the analytical comparative study, modeling of each of the HT-PEMFC stack and ORC plate heat exchanger for the ORC power generation system, previous experimental results under combined power generation system was conducted. In particular, in order to secure the the same operating conditions and the model-based analysis results established in this study reliability of the plate heat exchanger for the ORC power generation system, previous were compared. The reliability of the combined power generation system model was secured experimental results under the same operating conditions and the model-based analysis results through this process. established in this study were compared. The reliability of the combined power generation Using the established combined power generation system model, the power generation system model was secured through this process. performance and system efficiency of each stack and ORC system according to the power Using the established combined power generation system model, the power generation generation load and operating temperature of the HT-PEMFC stack were compared analytically. performance and system efficiency of each stack and ORC system according to the power It is believed that the model has a higher degree utilization in a HT-PEMFC stack in which the generation load and operating temperature of the HT-PEMFC stack were compared higher the operating temperature within the allowable range, the higher the power generation analytically. It is believed that the model has a higher degree utilization in a HT-PEMFC stack and efficiency is. It also has higher degree utilization at a stack operating temperature where the in which the higher the operating temperature within the allowable range, the higher the waste heat that is proportional to the power generation load is relatively high. Furthermore, it is power generation and efficiency is. It also has higher degree utilization at a stack operating determined that the stack capacity and rated power generation section (current density range temperature where the waste heat that is proportional to the power generation load is during power generation) need to be selected considering the target subjects as the amount relatively high. Furthermore, it is determined that the stack capacity and rated power generation section (current density range during power generation) need to be selectedPDF Image | Combined Power Generation System Based on HT-PEMFC and ORC
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