(NWV-36) Integrated Optimization of Aircraft Subsystems
Final rept. 1 Mar-31 Oct 98
MARYLAND UNIV COLLEGE PARK DEPT OF MECHANICAL ENGINEERING
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The goal of this project is to demonstrate by using a heat exchanger as an example, that the minimization of life cycle entropy generation is a useful concept for the optimization of thermal systems. For this purpose the entropy production over the life of the heat exchanger is calculated and in addition the entropy generated during the manufacturing process is accounted for too. In this exploratory phase of the project, the entropy generation during the manufacturing process is calculated based only on the entropy production during the various energy conversion processes that contribute to the manufacturing process. This includes the metal processing beginning with theore and accounting for a fraction of recycled metal that is usually included it also accounts for the contribution of human labor, although this term is found to be usually negligible. A simulation code was written for the heat exchanger to calculate and minimize its life cycle entropy generation. The results clearly show that minima are found when design parameters such as material selection, tube length, number 0 tubes, operating conditions and others are varied. The results also indicate that this method will continue to be useful when applied to more complex systems such as entire subsystems and complete, integrated systems such as aircraft.
- Test Facilities, Equipment and Methods