Anode Hose

Anode recirculation line for fuel cell power system.

Functional Requirements: The technical and functional attributes and performance aspects of a system or its components. Each requirement is a functional one as soon as it can be practically provided with at least one test case. Each functional requirement approved for implementation must be realized and successfully tested. 

Non-Functional Requirements: Overall product characteristics, quality aspects, design constraints and boundary/ environmental conditions under which the functional requirements will have to be performed. They usually set limitations to the range of possible technical solutions and mostly deal with topics like efficiency, reliability, usability, maintainability, portability, safety, flexibility. Non-functional requirements must at least be validated by review.