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Öğe Energy and exergy analysis of erciyes university No. 1 heat center(Institution of Chemical Engineers, 2024) Polat, Busenur; Acar, Halil İbrahim; Kahraman, NafizThe present study comprises an energy and exergy analysis of a steam boiler with a capacity of 10 tons of steam per hour, 9817 m of pipelines of various diameters, and 96 heat exchangers in the heat exchanger centers under the usage unit (hospitals, academic institutions, and residences located) in Erciyes University Heat Center, which is still in use in Kayseri. Each element's exergy loss was calculated. These findings led to the discovery of exergy yields (second law yields). The outcomes are presented graphically. The analysis revealed that the steam boiler was the component with the most significant exergy loss, amounting to 5151.12 kW. The thermal efficiency of the boiler was calculated to be 93.1 %, while the exergy efficiency was determined to be 28.6 %. Following the boiler, the line losses in the pipelines were calculated to be 3.14 %. The second law efficiency of the Heat Center was found to be 22.7 %. © 2024 The Institution of Chemical EngineersÖğe Investigation of the effects of using hydrogen enriched fuel blends in a diesel engine on engine performance, combustion and exhaust emissions(Elsevier ltd, 2025) Vargün, Mustafa; Yapmaz, Ahmet; Kalender, Volkan; Yılmaz, İlker TurgutDue to the increasing energy supply and limited availability of fossil fuels, which rank first in energy supply, price fluctuations, and the release of pollutant emissions as a result of combustion, researchers are conducting research on more environmentally and friendly fuels that can be produced from renewable energy resources, have a lower C/H ratio. In this study, the use of 3 different fuel types (biodiesel, biodiesel-H2 and biodieselethanol-H2) in a 4-stroke, 4-cylinder diesel engine at a constant 1750 rpm engine speed and different engine loads (from 40 Nm to 100 Nm increase by 20 Nm engine load) impacts on diesel engine characteristics in terms of performance, combustion and exhaust emission characteristics were examined. It was determined that BSFC decreases by more than 20% with increasing engine load. In addition to this, maximum BSFC was seen in as 373 g/kWh in BD70E30 fuel. Increase in engine load, also led rise in cylinder gas pressure from 80 bar to more than 125 bar. It was shown that blended fuels improve cylinder gas pressure and control the maximum pressure rise rate by reducing ignition delay under certain test conditions. Compared to biodiesel fuel, blended fuels were seen to significantly reduce HC and CO2 emissions but slightly increase NO emissions. For all fuel types maximum NO emission was obtained at 100 Nm as 29.6 g/kWh, 31.4 g/kWh and 30.7 g/kWh, respectively BD100, BD100+H2 and BD70E30+H2.
