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    Exergetic and thermoeconomic analyses of a coal-fired power plant
    (Elsevier France-Editions Scientifiques Medicales Elsevier, 2017) Uysal, Cuneyt; Kurt, Huseyin; Kwak, Ho-Young
    Exergetic and thermoeconomic analyses of a coal-fired power plant with 160 MW capacity where located in Turkey were performed. Specific Exergy Costing (SPECO) and Modified Productive Structure Analysis (MOPSA) methods were separately applied to the system to determine the unit exergy cost of electricity generated by the coal-fired plant. The differences of these methods were discussed. As a result, the exergy efficiency of coal-fired power plant is found to be 39.89%. The equipment having the highest improvement potential is determined as boiler. The unit specific exergy cost of electricity generated by the system obtained for SPECO and MOPSA thermoeconomic analysis methods are 12.14 US$/GJ and 14.06 US$/GJ, respectively. The unit specific exergy cost of electricity obtained by using MOPSA thermoeconomic method is the same as the one obtained by the overall cost-balance equation for the coal-fired power plant. (C) 2017 Elsevier Masson SAS. All rights reserved.
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    Role of Waste Cost in Thermoeconomic Analysis
    (Mdpi, 2020) Uysal, Cuneyt; Kwak, Ho-Young
    Power plants or thermal systems wherein products such as electricity and steam are generated affect the natural environment, as well as human society, through the discharging of wastes. The wastes from such plants may include ashes, flue gases, and hot water streams. The waste cost is of primary importance in plant operation and industrial ecology. Therefore, an appropriate approach for including waste cost in a thermoeconomic analysis is essential. In this study, a method to take waste cost into account in thermoeconomics to determine the production cost of products via thermoeconomic analysis is proposed. The calculation of the waste cost flow rates at the dissipative units and their allocation to system components are important to obtain the production cost of a plant.
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    Thermoeconomic diagnosis of an air-cooled air conditioning system
    (Inderscience Enterprises Ltd, 2018) Yoo, Yungpil; Oh, Hoo-Suk; Uysal, Cuneyt; Kwak, Ho-Young
    Diagnosis of a 120-kW air-cooled air conditioning system under faulty conditions was performed using modified productive structure analysis. Unit cost of cooling capacity for the system and lost cost flow rate for components were calculated based on data obtained by using a simulator for the cases of pre-fixed faulty and normal operating conditions. The relative malfunction (RMF) and the relative difference in the lost cost flow rate between real and normal operations (RDLC) were found to be effective indicators to identify the malfunction components. Results revealed that malfunction due to fouling at the condenser and evaporator, compressor valve leakage, the superheating in the suction line and refrigerant undercharge, whose fault levels by the percent degradation induced in the cooling capacity are 3.4%, 10.5%, 15.1%, 3.5% and 4.1%, respectively, can be identified. Unit cost of the cooling capacity of the system increases when malfunction occurs at any component in the air conditioning system.