Energy, exergy and environmental analysis and multi-objective optimization of a solar renewable energy multi-generation system considering the summer daytime climatic conditions of Mediterranean region in Turkey
In this study, a novel concentrated solar thermal energy driven renewable energy system for multi-generation products is proposed and analyzed. Analysis is performed for the summer daytime climatic conditions of both the selected cities of Antalya, Hatay and Kahramanmaras and Mediterranean region in Turkey. A heliostat field and solar tower-based intercooling-regenerative open Brayton cycle is used as the primary power cycle. Two organic Rankine cycles are coupled to utilize the waste heat of the intercooling and the exhaust of the topping cycle. To produce multi-generation products of power, cooling, green hydrogen, fresh water, industrial process heating and domestic hot water, the proposed plant is incorporated with an electrolyzer, a multi-effect desalination system, an absorption chiller cycle, an industrial process heater and a domestic hot water chamber. Study is performed with energy, exergy and environmental analyses to examine the system performance. A detailed parametric analysis is carried out to investigate the effects of variation of some important design parameters on the performance indicators of energy efficiency, exergy efficiency, exergetic quality factor (EQF) and emission savings for the proposed plant considering the climatic conditions of the selected cities. Multiobjective optimization of the proposed plant is conducted to determine the optimum operating conditions of the plant. The proposed MG system has energy and exergy efficiencies and exergetic quality factor of 49.37%, 39.63% and 57.12%, respectively, while it saves 266.1 kg CO2 emissions per hour. The optimized system operates at the highest performance in Kahramanmaras among analyzed cities.
Mert Çolakoğlu is an Industrial Engineer graduated from Middle East Technical University. He completed his MSc degree in Istanbul Technical University, Institute of Energy, on thermodynamic analysis of energy systems. He is conducting his PhD thesis study in Istanbul Technical University, Institute of Energy, on the thermodynamic, economic and environmental analyses of renewable energy based multi-generation systems.