Abstract
Recently, extensive studies on power generation using clean energy have been conducted to reduce air pollution and global warming. In particular, as existing internal combustion engines lose favor to power generation through hydrogen fuel cells, the development of tri-generation technology using efficient and reliable fuel cells is gaining importance. This study proposes a tri-generation thermal management model that enables thermal control and waste heat utilization control of a high-temperature PEMFC stack that simultaneously satisfies combined cooling, heating, and power (CCHP) load. As the high-temperature PEMFC stack operates at 150 °C or more, a tri-generative system using such a stack requires a thermal management system that can maintain the operating temperature of the stack and utilize the stack waste heat. Thus, to apply the waste heat produced through the stack to heating (hot water) and absorption cooling, proper distribution control of the thermal management fluid (cooling fluid) of the stack is essential. For the thermal management fluid control design, system analysis modeling was performed to selectively design the heat exchange amount of each part utilizing the stack waste heat. In addition, a thermal management system based on thermal storage was constructed for complementary waste heat utilization and active stack cooling control. Through a coupled analysis of the stack thermal management model and the absorption cooling system model, this study compared changes in system performance by cooling cycle operation conditions. This study investigated into the appropriate operating conditions for cooling operation in a tri-generative system using a high-temperature PEMFC stack.
Highlights
With rising air pollution due to fossil fuel-based power generation, improving energy efficiency through environmentally friendly power generation technology has increasingly gained widespread attention
We use the integrated tri-generative system model to confirm the operating temperature change of the high-temperature PEMFC stack according to the load variation of the cooling system
triehylene glycol (TEG) is configured to circulate through a single drive pump operating at a constant power, while the changes in stack temperature and cooling and heating load were checked through each valve control
Summary
With rising air pollution due to fossil fuel-based power generation, improving energy efficiency through environmentally friendly power generation technology has increasingly gained widespread attention. In the tri-generative system, as it was necessary to control the distribution of triehylene glycol (TEG), the thermal management fluid of the overall system, we conducted a system analysis to confirm the appropriate control range under the corresponding operating conditions This was necessary to configure the complementary waste heat recovery amount by cooling and heating the load and managing the active thermal management of the stack, which operates at high temperatures of at least 150 ◦ C based on thermal storage to manage the thermal management fluid. To approach this effectively, we implemented an integrated tri-generation thermal management system model that can be interfaced with FloMaster through the absorption cooling system configuration using the Engineering Equation Solver (EES) program. We compared stack thermal management and system performance changes according to the main operating conditions of the cooling system
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