Session: 08-09-01: Multi-Energy Systems

Paper Number: 145859

145859 - New Design of an Integrated System of Supercritical Co2 Cycle and Multi-Effect Desalination and Organic Rankine Cycle for Concentrated Solar Power in Saudi Arabia 

Due to the increase in our population and improving living standards, the demand for power and clean drinking water is constantly increasing. According to the U.S Energy Information Administration (EIA), global energy consumption is expected to increase by approximately 50% by 2050. Moreover, the need for fresh water in the world is projected to rise by around 75% by 2050. Therefore, to meet this energy demand and maintaining low environmental pollution associated with fossil fuels, recovering the waste heat, developing an efficient energy system and using renewable energy sources are best solutions to achieve these goals.

The NEOM city has been used as location in this study. NEOM city is a planned city (New city) in the Tabuk Province, in the northwest of Saudi Arabia. The site covers a total area of 26,500 km2 stretching 460 km. The project has an estimated cost of US$500 billion. NEOM city will be home and workplace for more than a million people from around the world, building a new model for sustainable living, working, and prospering. The city is planned to be completely powered by renewable energy sources. 

The Supercritical carbon dioxide (sCO2) Brayton power cycle has received significant attention as a future power conversion system due to its low capital cost, high efficiency and compact plant components as an alternative to steam-Rankine cycle. Furthermore, solar tower system as well is rapidly growing recently compared to the other concentrated solar power (CSP) systems due to its low cost and high operating temperature.

In the current work, a new proposed configuration has been studied to produce power and fresh water. Furthermore, a solar tower with two tank thermal storage is used for the proposed system. The new proposed configuration uses the heat transfer fluid which is molten salts from hot tank to operate the supercritical CO2 recompression Brayton cycle in the primary heat exchanger. The temperature of the molten salts exiting the primary heat exchanger is used to generate motive steam for a multi-effect desalination system with thermal compression vapor (MED-TVC) to produce fresh water. The waste heat in the precooler of the sCO2 recompression cycle is used to run the organic Rankine cycle.

 A detailed steady state model is developed for new proposed configuration to perform energy and economic analyses with power and freshwater production using Engineering Equation Solver (EES). The results show that the newly proposed system has a high overall performance efficiency and lower cost compared to the standalone system. Furthermore, the waste heat of the system has been reduced significantly.

Presenting Author: Sattam Alharbi University of Ha'il

Presenting Author Biography: Assistant Professor at university of Ha'il.

Authors:

Sattam Alharbi University of Ha'il