Finding a combination of design variables for an optimized design target is the main aspect in fuel cell system design. Beside that, it has to be ensured that all requirements, on component and vehicle level, are met. Using a visualization approach, called Design Requirement Map, as a graphical presentation of the design target and the requirements of two degrees of freedom, helps to answer certain design questions and enable an estimation of the influence of requirements and operating points on the optimal system design. In this paper, first, the general fuel cell system design problem is formulated and, second, the Design Requirement Map is used to study the influence of requirements on the optimal combination of humidifier scale and air compression ratio. Designs with too small or too large humidifiers reveal as designs, which are constrained by at least one of the considered requirements. In addition, the influence for a multi-objective design target and different ambient temperatures and pressures are addressed. For certain design questions using Design Requirement Maps can be very helpful to evaluate the impact of requirements on the system design especially when considering different operating points.

中文翻译：

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使用设计需求图评估需求对燃料电池系统设计的影响

为优化设计目标寻找设计变量的组合是燃料电池系统设计的主要方面。除此之外，必须确保满足组件和车辆级别的所有要求。使用称为设计要求图的可视化方法，作为设计目标和两个自由度要求的图形表示，有助于回答某些设计问题，并能够估计要求和操作点对最佳系统设计的影响. 在本文中，首先制定了一般燃料电池系统设计问题，其次，利用设计需求图研究了需求对加湿器规模和空气压缩比优化组合的影响。加湿器太小或太大的设计都显示为设计，受到至少一项考虑要求的约束。此外，还解决了多目标设计目标和不同环境温度和压力的影响。对于某些设计问题，使用设计需求图非常有助于评估需求对系统设计的影响，尤其是在考虑不同操作点时。