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    Environmental damage cost and exergoenvironmental evaluations of piston prop aviation engines for the landing and take-off flight phases
    (Elsevier, 2022) Balli, Ozgur; Kale, Utku; Rohács, Dániel; Hikmet Karakoc T.
    This study presents a comprehensive investigation of the environmental damage cost, exergoenvironmental and life cycle assessment (LCA) analyses of four piston prop aviation engines (AE) entitled as AE1, AE2, AE3,and AE4 for different flight conditions. The data of energetic, exergetic, economic, and exergoeconomic as well as emission are firstly given as a briefly. Then, cost formation of environmental damages, LCA, and exergoenvironmental analyses are realized. AE3 has minimum specific environmental damage with 0.0380 $/MJ and the lowest specific exergoenvironmental cost with 0.360 $/MJ for take-off phase. Besides, minimum environmental impact values of engine shaft power are estimated to be 29.33 mPts/MJ for AE1 in taxi phase, 23.93 mPts/MJ for AE3 in take-off phase, 26.36 mPts/MJ for AE1 in climb-out phase, and 25.20 mPts/MJ for AE2 in approach phase. Fuel consumption is main contributor for environmental impact with over 89%. The highest relative environmental differences is occurred in AE4 by 1001.69% for taxi phase while AE1 has minimum exergoenvironmental factor. and AE3 has minimum values of environment impact point costs. As a result, AE3 is the best engine in the perspective of thermodynamically, economically and environmentally.
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    Exergoenvironmental, environmental impact and damage cost analyses of a micro turbojet engine (m-TJE)
    (Elsevier Ltd, 2022) Balli, Ozgur; Kale, Utku; Rohács, Dániel; Karakoc, T. Hikmet
    This study presents a comprehensive investigation of the emission impact, environmental damage cost, exergoenvironmental and life cycle assessment (LCA) analyses of a micro turbojet engine (m-TJE) utilized on Unmanned Air Vehicle (UAV) for four different operating cases. The novelty and motivation to conduct this study are that no study in the literature was done about the environmental damage cost and exergoenvironmental analyses based on exergy and LCA of a micro turbojet engine used on UAVs. According to the results of this study, the engine product exergy rate increasing from 27.119 MJ/h at Case-1 to 114.742 at Case-4 while the engine's specific emission impact (sei) value decreases from 13.346 mPts/MJ at Case-1 to 5.440 mPts/MJ at Case-4. Similarly, the specific environmental damage cost of engine product decreases from 0.150 $/MJ at Case-1 to 0.061 $/MJ at Case-4 whilst the specific exergy cost of engine product goes down from 0.249 $/MJ at Case-1 to 0.088 $/MJ at Case-4. In this regard, the specific exergoenvironmental cost of engine product declines from 0.400 $/MJ at Case-1 to 0.150 $/MJ at Case-4. Besides, the specific exergoenvironmental impact of engine product reduces from 71.694 mPts/MJ at Case-1 to 29.219 mPts/MJ at Case-4 when the relative exergoenvironmental impact difference of engine product falters from 1257.306 % at Case-1 to 453.162 % at Case-4. This investigation shows that an increase in engine product rate reduces specific emission impact, specific environmental damage cost, specific exergy cost, specific exergoenvironmental impact, and relative exergoenvironmental impact difference of engine production.