Integrated Working Fluid and System Optimization for Airborne Waste Heat Recovery Applications
Integrated Working Fluid and System Optimization for Airborne Waste Heat Recovery Applications
M.E. Krikke (TU Delft - Aerospace Engineering)
Carlo M. De Servi – Mentor (TU Delft - Flight Performance and Propulsion)
L. Galieti – Mentor (TU Delft - Flight Performance and Propulsion)
Piero Colonna – Graduation committee member (TU Delft - Flight Performance and Propulsion)
K. Hooman – Graduation committee member (TU Delft - Heat Transformation Technology)
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Abstract
This study investigates optimizing working fluids and system design for Waste Heat Recovery (WHR) in turboelectric aircraft, focusing on the Onera Dragon concept. Using the PC-SAFT equation of state and QSPR models, the research identifies optimal fluids for an Organic Rankine Cycle (ORC)-based airborne WHR system. The method includes optimizing pseudo-fluids, which are mapped to real fluids based on PC-SAFT parameter proximity. A bi-objective optimization also attempts to find real-fluid optima directly. The best pseudo-fluid achieved a 1.56% fuel saving, while the best real fluid, acetyl chloride, achieved 1.37%, outperforming cyclopentane’s 0.92%. The bi-objective approach did not yield better real-fluid results. Binary mixtures of non-polar pseudo-fluids and blends of cyclopropane and cyclopentane showed no improvement, indicating no benefit from temperature glide in the condenser.