摘要

In this paper, a natural gas fueled 1 kW residential combined heating and power (CHP) system based on solid oxide fuel cell (SOFC) is established, and the conceptual design and mathematical analysis are presented. A quasi-two dimensional SOFC model and the system model which is proposed to predict the system performance are developed and validated, and the system performance under design-point condition is explored. The influences of decisive design parameters on the system performance and selection principle of design-point condition are investigated. The results indicate that the SOFC CHP system designed in this paper can produce 1.005 kW electric power and 0.521 kW heating power. The system electric efficiency of 52.1% and cogeneration efficiency of 79.2% can be achieved respectively. The cell output voltage, system inlet fuel flow rate, and SOFC stack inlet air temperature affect the system greatly and non-monotonously. The resulting performance characteristics are obtained, which are of great significance for the design, optimization and safe operation of SOFC CHP systems.

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