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Exergy, pinch, and reliability analyses of an innovative hybrid system consisting of solar flat plate collectors, Rankine/CO2/Kalina power cycles, and multi-effect desalination system
Type Article
Integrated power generation Rankine/CO2/Kalina power cycles Solar flat plate collectors Multi-effect desalination Pinch and exergy analyses Reliability assessment
Nowadays due to increasing energy demand in the world, the use of energy systems with maximum effi- ciency is unavoidable. Thermal integration of the systems decreases the number of equipment employed and also raises the efficiency of the hybrid configuration. In the present study, an innovative hybrid system for cogeneration of power and desalinated water including organic Rankine unit, carbon dioxide power plant, Kalina power cycle based on the seawater temperature difference, and multi-effect desalination system is developed. Part of the heat required by the system is provided by solar flat plate collectors. The innovative hybrid system produces 849.5 MW power and 198.5 kg/s potable water. Exergy investigation of the system indicates that the most exergy destruction in the whole system belongs to the combustion chamber and heat exchangers, each of which is 46.60% and 34.91% of the total exergy destruction, re- spectively, which shows that more than 80% of exergy destruction is related to these two parts. The exergy efficiency of the whole system is 44.81%. Through the pinch method, the heat exchanger network related to the multi-stream heat exchangers of the hybrid system is extracted. The effect of air /fuel ratio (inlet to the combustion chamber) on system performance in the parametric analysis is examined. One of the main results is a 12.69% improvement compared to the initial state of total electrical efficiency of the structure in case of increasing the fuel input to the combustion chamber up to 62.00 kg/s. By system reliability analysis and examining different modes of failure and repair rates of different sections of the system, the probability of the structure operation in different cases is extracted.
Researchers Bahram Ghorbani (First researcher) , Armin Ebrahimi (Second researcher) , Mostafa Moradi (Third researcher)