TY - JOUR ID - 56 TI - New Method for Industrial Water Reuse and Energy Minimization JO - International Journal of Environmental Research JA - IJER LA - en SN - 1735-6865 AU - Ataei, A. AU - Panjeshahi, M.H. AU - Gharaie, M. AD - Department of Energy Engineering, Graduate School of the Environment and Energy, Science and Research Branch, Islamic Azad University, P.O. Box: 14515-775, Tehran, Iran AD - Department of Engineering, University of Tehran, Tehran, Iran AD - Department of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran Y1 - 2009 PY - 2009 VL - 3 IS - 2 SP - 289 EP - 300 KW - Heat exchanger network KW - Heat loss KW - Heat Recovery KW - Non-isothermal mixing KW - Separate system DO - 10.22059/ijer.2009.56 N2 - Water and energy are key commodities utilized in the process industries.Water minimization and energy minimization have been studied separately. In this paper, a new systematic design methodology has been developed for the simultaneous management of energy and water systems that also feature maximum re-use of water. In addition to allowing re-use of water, issues about heat losses inside unit operations have also been incorporated in this new design method. To implement such a design, two new design aspects are introduced; new method for “Non-isothermal Mixing” points identification and new “Separate System” generation. The first aspect involves “non-isothermal mixing”, which enables direct heat recovery between water streams, and therefore allows the reduction of the number of heat transfer units. An NLP model is formulated to identify feasible non-isothermal mixing points in the network regarding minimum operation cost, which satisfy minimum freshwater and utility requirements. The other aspect is the generation of “separate system” in heat exchanger network design. The flexibility of mixing and splitting of water streams allows separate systems to be created as a cost-efficient series of heat exchanger units between freshwater and wastewater streams. The new design aspects have been illustrated with an example. UR - https://ijer.ut.ac.ir/article_56.html L1 - https://ijer.ut.ac.ir/article_56_ce513d47c55226638284e068a587b489.pdf ER -