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ÖZDEMİR KÜÇÜK, ESRA

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ÖZDEMİR KÜÇÜK

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    Publication
    Comparative performance analysis of ORC-VCRC combined systems based on refrigerant selection
    (Taylor & Francis, 2021-01-01) Özdemir Küçük, Esra; Kılıç, Muhsin; ÖZDEMİR KÜÇÜK, ESRA; KILIÇ, MUHSİN; Bursa Uludağ Üniversitesi/Yenişehir İbrahim Orhan Meslek Yüksekokulu/Makine Bölümü.; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü.; 0000-0001-8146-0495; 0000-0003-2113-4510; AAG-6562-2021; O-2253-2015; IQW-0498-2023
    In this study, the combined power and refrigeration cycles driven by low-grade thermal energy are evaluated. An organic Rankine cycle (ORC) and a vapor compression refrigeration cycle (VCRC) are linked for both power generation and cooling. Three different combined cycle configurations are considered in the analyses. These are a basic ORC-VCRC, a dual-fluid basic ORC-VCRC, and a dual-fluid ORC-VCRC with an internal heat exchanger (IHE) and liquid-vapor heat exchanger (LVHE). The effects of the combined cycle configuration design on overall coefficients of performance (COPs) and the exergy efficiency of the system are examined. The highest overall COPs and exergy efficiency values at the operating conditions are obtained for the dual-fluid ORC-VCRC with IHE-LVHE as 0.72 and 19.5%, respectively. A comprehensive energy and exergy analysis is also performed for the dual-fluid ORC-VCRC with IHE-LVHE. The selection of the optimum fluid pair for ORC-VCRC is also investigated in the study. Thirty different fluid pair combinations are evaluated and compared using R123, R245fa, R600, R114, R141b, R290, R134a, and R143a refrigerants. The parametric analysis of the integrated system is performed depending on various operating conditions. Results show that the best performance among the cases considered is observed when the refrigerant R123 is used in the ORC-VCRC combined system.
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    Publication
    Exergoeconomic analysis and multi-objective optimization of orc configurations via taguchi-grey relational methods
    (Cell Press, 2023-04-02) Küçük, Esra Özdemir; Kılıç, Muhsin; ÖZDEMİR KÜÇÜK, ESRA; KILIÇ, MUHSİN; Bursa Uludağ Üniversitesi/Yenişehir İbrahim Orhan Meslek Yüksekokulu/Makine Bölümü; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü; 0000-0001-8146-0495; 0000-0003-2113-4510; IQW-0498-2023; O-2253-2015
    Recovery of low-grade waste heat in industrial processes is an essential energy management topic. Yet, most low-temperature heat sources discharge their heat directly into the environment. The Organic Rankine Cycle (ORC), which has the benefits of being energy-efficient, enabling investment savings, and being ecologically friendly, is crucial in recycling energy from lowtemperature waste heat. Both the application of the optimum cycle design and the provision of optimum working conditions are the issues that need to be focused on efficiently using energy. This study performs the energy, exergy, and exergoeconomic analysis of four different organic Rankine cycle configurations operating with renewable or low grade waste heat. The effect degrees and ratios of selected control factors are calculated using Taguchi and variance analysis methods to compare thermal and exergy efficiencies, total system cost, and unit cost of electricity produced by the system. The objective function of the multi-objective optimization problem is defined, and its solution is realized with the Taguchi-Grey Relational Analysis method. The best thermodynamic and exergoeconomic performance result is calculated for the configuration of ORC with Feed Fluid Heater-Internal Heat Exchanger (IHE-FFH-ORC). As a result of Taguchi and ANOVA analysis, the factors that most affect the thermal efficiency of the system, the exergy efficiency, the total system investment cost, and the unit cost of the electricity produced are, respectively, the evaporation temperature (-50%), turbine efficiency (-25%), working fluid (-20%), subcooling (-4%), pump efficiency (-0.05%), and superheating (-0.05%). As a result of the optimization process, the thermal and exergy efficiencies, the total system cost and the unit cost of produced electricity for the IHE-FFH-ORC power system are calculated as 22.6% and 73.5%, 1.06 $/h, 0.039 $/kWh and 2.9 years, respectively.