Optimal Design and Operation of A Syngas-fuelled SOFC Micro-CHP System for Residential Applications in Different Climate Zones in China

Energy consumption in residential sector can be considerably reduced by enhancing the efficiency of energy supply. Fuel cell-based residential micro-CHP systems are expected to be one of the most promising technologies because of their high efficiency and low environmental impact. Since the design and operation of CHP system are greatly dependent upon the seasonal atmospheric conditions, which determine directly the thermal and electrical demands of residents, it is important to evaluate the performance of the CHP system under difference climate conditions to ensure that it matches well with the local heat-to-power load ratio. Therefore, the aim of this study is to investigate the optimal design and operation of a syngas-fuelled SOFC micro-CHP system for small households located in five different climate zones in China. The ability of the micro-CHP to cover the heat and electricity demand of a 70m2 single-family household with an average number of occupants of 3 is evaluated. Detailed model of the micro-CHP unit coupled with a hot water storage tank and an auxiliary boiler is developed. A transient model of the hot water storage tank is used to take into account the effect of peak residential heat demand. Numerical simulations are conducted in Matlab environment. System design trade-offs are discussed to determine the optimal match between the energy demand of the household for different climates across China and the energy supply of the micro-CHP during the whole year. Moreover, criteria for sizing the system components of the micro-CHP are addressed specifically. The developed methodology can be applied to different types of residence with different load profiles