Developing a tri-generation system of power, heating, and freshwater (for an industrial town) by using solar flat plate collectors, multi-stage desalination unit, and Kalina power generation cycle

摘要

In this paper, an integrated structure of cogeneration and freshwater production for residential complexes usage in an industrial town of Assaluyeh, in south of Iran and besides to the Persian Gulf is developed and analyzed. In this process, solar flat plate collectors on the houses roof to provide the required thermal energy, Kalina cycle to generate integrated power and a multi-stage desalination process for the freshwater production of residential complexes, are utilized. The proposed system is simulated through TRNSYS, HYSYS, and MATLAB Software. This integrated structure has the capability of simultaneous production of 1869 kW power, 65194 kW heating and 83.22 kg/s freshwater for residential complexes. Based on the results the integrated structure has a total thermal efficiency of 44.64% and a total exergy efficiency of 90.04%. Exergy analysis shows that the highest amount of exergy destruction on a specific day of the year, the percentage of the destructed exergy from the input exergy flow, occurs in the solar flat collectors and the auxiliary boiler, 54.72%, 21.89%, respectively. By sensitivity analysis of the important indices for the developed integrated structure, including the number of collectors, the mass flow rate of the collector and the molar composition of the Kalina power generation cycle, an appropriate solution is proposed to improve the modeling effective parameters.