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Showing 2 results for Exergoeconomic Analysis
Seyyed Muhammad Pourfatemi, Rouhollah Ahmadi,
Volume 17, Issue 10 (1-2018)
Abstract
In recent years, the importance and requirements for high-quality energy and water has been increased significantly, and this trend will strongly continue. One of the promising solution for the water scarcity's problem is desalination of the oceans salt water by thermal methods, and if the required thermal energy is provided by wastes of a thermal power plant it will be competitive with other methods. In this paper, a combined cycle including solid oxide fuel cell (SOFC) and gas turbine is used as thermal resource. Here, combination of these two systems beside of multi effect desalination (MED) system leads to reduce in energy consumption, pollutant emissions, investment and operation and maintenance cost, as well as increase of efficiency in comparison with the conventional individual systems. Exergetic and economic analysis using a computer program in EES software was performed. The results proposed a system with thermal and exergy efficiency of 60 % and 57%, respectively. The system expenditures and revenues were estimated, and the effect of two important design parameters, i.e. operational temperature and current density of fuel cell, on exergy efficiency and levelized cost of electricity were investigated. Consequently, the reliability and availability of the proposed system are calculated as 0.842, using the Markov method. It is seen after reliability analysis and availability calculation the exergy and energy efficiency is reduced and LCOE increased by 8.8%.
M. Abdollahi Haghghi, S.m. Pesteei , A. Chitsaz Khoyi,
Volume 19, Issue 2 (2-2019)
Abstract
In this paper, a study from the perspective of exergy and cost in the framework of exergoeconomic analysis of a heating and power generation system with parabolic trough solar collectors was carried out as a case study to be used at the engineering faculty of Urmia University. The system consists of a solar subsystem with an Organic Rankine Cycle (ORC). This study is based on three different solar radiation modes during a day, including solar mode, solar and storage mode, and storage mode. In the first mode, the solar flux is at a low level and there is no energy storage. In the second mode, there is energy storage in addition to running the ORC by collectors. In the third mode, only storage tank is used. Paying attention to the actual energy demand of the location and the analysis according to the variable solar radiation are the important points of this study. Due to the weather conditions prevailing on the building, its heating load is 1253.2kW. Also, the electric power required is about 1500kW. Exergoeconomic analysis is based on three important design parameters, including the number of the day through the year, ORC pump input temperature, and ORC turbine inlet pressure examined. The results indicate that in a cold day, the cost per unit of exergy in the three mentioned modes are about 19$/GJ, 16$/GJ, and 20$/GJ, respectively. Also, the highest exergy destruction rate occurs in parabolic trough solar collectors and ORC evaporators.
