International Journal of Energy Engineering Dec. 2015, Vol. 5 Iss. 6, PP. 185-192 - 185 - DOI: 10.5963/IJEE0506003 Exergoeconomic Analysis of a Power Plant in Abu Dhabi (UAE) Ahmed Nabil Al Ansi 1 , Mubarak Salem Ballaith 2 , Hassan Ali Al Kaabi 3 , Zin Eddine Dadach* 4 1,2,3,4 Chemical Engineering Department, Abu Dhabi Men’s College, Higher Colleges of Technology, Shakhbout Bin Sultan Street, Abu Dhabi (Abu Dhabi), UAE *zdadach@hct.ac.ae Abstract- Following a previous exergy analysis of a power plant in Abu Dhabi (UAE), a detailed exergoeconomic analysis of the plant based on Specific Exergy Costing (SPECO) method is presented in this investigation. The objective of this applied research is to compare the values of the different exergoeconomic variables of the Open Cycle Gas Turbine (OCGT) calculated during summer atmospheric conditions to the values obtained from the simulation of the plant using design conditions. The results show that summer conditions have increased the total exergy destruction of the power plant and its cost rate respectively by 1.95% and 10%. The negative effects of summer atmospheric conditions on the cost of exergy destruction in the combustion chamber and the compressor are compensated by their positive effects on the turbine. In order to minimize the effects of the summer atmospheric conditions on the performance of the power plant, it is recommended to add a cooling system before the compression of air and a process control system based on the analysis of carbon monoxide, and oxygen of the exhaust gas leaving the combustion chamber. Keywords- Open Cycle Gas Turbine; Exergoeconomic Analysis; Cost of Exergy Destruction; Specific Exergy Costing (SPECO) Method I. INTRODUCTION The final objective of increasing exergy efficiency of power plants is to reduce the consumption of fuel in order to minimize its environmental impact. In exergoeconomic and exergoenvironmental analyses, exergy destruction costs and environmental impacts are linked to irreversibilities [1-2]. The combination of exergy with costs was first used by Keenan [3] and the concept of exergoeconomics was introduced by Tsatsaronis [4]. The exergoeconomic accounting method is used in the design and operation of gas turbines to calculate the costs of final products as well as the costs of the exergy destroyed within each piece of equipment. Exergoeconomic accounting can be considered an exergy-aided cost reduction approach that uses the exergy costing principle [5]. The standard conditions used for the design of the gas turbine under investigation are 288 K, sea level atmospheric pressure and 60% relative humidity. Its performance could therefore be lower during summer because the atmospheric conditions are different from the ISO requirements. Based on a previous investigation on the exergy analysis of a power plant in Abu Dhabi (UAE), this applied research is also a case study using a methodology described in reference [5]. The final objective of the specific exergy costing (SPECO) method is to detect the equipment of the power plant where it is cost effective to invest in order to reduce the cost of exergy destruction. II. BACKGROUND Exergy destruction (ED) within a component of a power generation plant is the measure of irreversibility that is the source of performance loss. An exergy analysis will determine the magnitude and the source of thermodynamic inefficiencies in a power plant. Fig. 1 Schematic Diagram of an Open Cycle Gas Turbine [5] Based on Figure 1, the exergy destruction (ED) and exergy efficiency (EE) for the three main components of an open cycle gas turbine (OCGT) are defined using the equations [5]: