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    Life cycle assessment of a Photovoltaic-Assisted Daylight simulated dryer
    (Elsevier, 2024) Cokgezme, Omer Faruk; Gunes, Neslihan Colak; Bayana, Damla; Icier, Filiz
    Food drying involves intense energy consumption; therefore, using solar energy instead of conventional ovens is an important alternative owing to sustainability and environmental impact. In this study, the effects of energy sources (grid electricity-GE, PV system, and grid + PV), light sources (Daylight-DL, LED, and DL + LED), and light intensities (2500, 7500, and 10,000 Lux) on energy/exergy efficiency, specific water removal ratio, improvement potential and impact categories were investigated for the developed Photovoltaic-Assisted Daylight Simulated Dryer (PVDD) system. In addition, the relation between the efficiencies and environmental effects was evaluated by correlation analysis. In the GE scenario, eta(energy) and eta(exergy) values ranged from 10.7 to 24.4 % and 1.55-4.48 %. In the GE + PV scenario these values ranged from 17.2 to 68.6 % and 3.67-33.3 %. Significant effects of energy source, light intensity and light source were determined (p < 0.05). In the case of LCA analysis, agricultural production had more than 60 % impact on the environmental impact values in the case of PV. The use of GE had relatively higher environmental impacts than PV. Efficiency values showed a negative correlation with all impact categories except land occupation. The results indicated that the system parameters significantly affected the environmental impacts and should be considered for the development of food processing.
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    Life cycle assessment of aerogels: a critical review
    (Springer, 2024) Kara, Ilkay Turhan; Kiyak, Baris; Gunes, Neslihan Colak; Yucel, Sevil
    Over the past decade, the increasing emphasis on sustainable material production has brought aerogel technology to the forefront of scientific and industrial research. Aerogels are known for their extraordinary properties, such as high porosity and low density, which make them suitable for a wide range of applications from thermal insulation in buildings to drug delivery systems. This review systematically investigates the sustainability of aerogel production by analyzing the environmental impacts identified in recent life cycle assessments (LCAs). It examines studies on aerogel production using different precursors, solvents, and energy-intensive production methods, especially drying techniques, providing a comprehensive analysis of the environmental footprints and highlighting several hotspots. The review particularly focuses on identifying the disparities in LCA methodologies and the results obtained, which are crucial for crafting a roadmap toward more sustainable aerogel production. The findings emphasize the need for standardized functional units and lifecycle phases that reflect the specific applications of aerogels, thus enabling more accurate comparisons and assessments. The review concludes with a discussion of the critical gaps in current LCA studies of aerogels. It also offers sustainability recommendations based on identified hotspots, advocating for improvements in aerogel production techniques that minimize environmental impacts, enhance material efficiency, and reduce waste. By addressing these gaps, this paper aims to foster a deeper understanding of aerogel sustainability and encourage the development of more environmentally friendly practices in aerogel production and application.
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    Life cycle assessment of apricot puree concentrate production
    (Elsevier Sci Ltd, 2024) Kiyak, Baris; Gunes, Neslihan Colak
    The key factors influencing the ecological impact of the food industry include intensive components such as waste management, logistics, energy consumption, and raw material usage. Holistically, these also offer a range of environmentally friendly improvement opportunities. The fruit juice industry needs the Life Cycle Assessment for sustainable improvements, especially for concentrated juice that requires high-energy evaporation. The study aims to conduct a cradle-to-gate Life Cycle Assessment of apricot puree concentrate production in Sultanhisar, Turkey. Open-access Agribalyse database and OpenLCA software and the ReCiPe impact assessment method have been used. The functional unit is chosen as 1 kg concentrated apricot puree transported to the retail center. The research results indicate that apricot production is the primary contributor, followed by harvested apricot transportation as the secondary factor, and evaporation as the tertiary factor to all environmental impacts approximately. Sensitivity, uncertainty, and scenario analyses are carried out. Sustainable improvement scenarios, in terms of photovoltaic utilization, result in a minor reduction in Global Warming Potential, ranging from 0.82% to 1.65%. On the contrary, logistics adjustments emphasize a significant hotspot with a reduction impact of 16.71%-19.67%.