The application demonstration case of the water-cooled hydrogen fuel cell relies on its core advantages of high power density, stable operation and recoverable waste heat, showing significant competitiveness in the field of efficient hydrogen energy utilization and becoming a preferred solution for distributed energy supply scenarios. Compared with other types of fuel cells, the water-cooled system effectively improves the battery power density through precise temperature control, ensuring that the equipment maintains stable performance during long-term continuous operation and reduces the failure rate. At the same time, it can efficiently recover the waste heat generated during operation, realize cascade utilization of energy, and greatly improve energy utilization efficiency. At present, this demonstration case is mainly applied in distributed combined heat and power (CHP) systems, which can simultaneously realize the coordinated supply of electrical energy and thermal energy. It can not only meet the user's power demand, but also use the recovered waste heat for heating, hot water supply and other scenarios, realizing "electricity + heat" comprehensive energy supply. Through the practical application in scenarios, it has fully verified the excellent performance of the equipment in efficient energy utilization, effectively solving the pain points of low energy utilization rate and high carbon emissions of traditional energy supply modes, providing solid practical support for the low-carbon transformation of centralized energy supply scenarios such as parks and communities, and helping to promote the large-scale and low-carbon application of hydrogen energy in the field of distributed energy supply.