Njepu, Ambrose O.ZhangXia, Xiaohua2020-08-132020-08-132019-02Njepu, A., Zhang, L. & Xia, X. 2019, 'Optimal tank sizing and operation of energy-water supply systems in residences', Energy Procedia, vol. 159, pp. 352-357.1876-6102 (online)10.1016/j.egypro.2019.01.003http://hdl.handle.net/2263/75674Applied Energy Symposium and Forum, Renewable Energy Integration with Mini/Microgrids, REM 2018, 29–30 September 2018, Rhodes, GreeceEnergy and water insecurities are global challenges, especially in arid and semi-arid regions. This paper proposes an optimal energy-water nexus management approach in residences using alternative energy and water resources, these alternatives are rainwater harvesting system, greywater recycling system, water storage, and gravity-fed distribution system. The Solving Constraint Integer Programming (SCIP) solver, in MATLAB’s OPTI toolbox, is used to solve the multi-objective optimization problem. Simulation results show that the optimal tank sizing and system operations will minimize the capital and operational cost of the system. The solver produced a potable water savings of 20.5% and an energy savings of 62.54%.en© The Authors. This is an open access article under CC BY-NC-ND license.Optimal tank sizingEnergy-water nexusEnergy efficiencyOperational optimizationArticle