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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5394

Title: On synthesis and optimization of cooling water systems with multiple cooling towers
Authors: Gololo, KV
Majozi, T
Keywords: Cooling water systems
Multiple cooling towers
Wastewater minimization
Water reuse
Cooling towers
Waste water
Engineering chemistry
Issue Date: Jan-2011
Publisher: American Chemical Society
Citation: Gololo, KV and Majozi, T. 2011. On synthesis and optimization of cooling water systems with multiple cooling towers. Industrial & Engineering Chemistry Research, Vol 50(7), pp 3775–3787
Series/Report no.: Workflow request;7719
Abstract: Cooling water systems are generally designed with a set of heat exchangers arranged in parallel. This arrangement results in higher cooling water flow rate and low cooling water return temperature, thus reducing cooling tower efficiency. Previous research on cooling water systems has focused mainly on heat exchanger network thus excluding the interaction between heat exchanger network and the cooling towers. This paper presents a technique for grassroot design of cooling water system for wastewater minimization, which incorporates the performances of the cooling towers involved. The study focuses mainly on cooling systems consisting of multiple cooling towers that supply a common set of heat exchangers. The heat exchanger network is synthesized using the mathematical optimization technique. This technique is based on superstructure in which all opportunities for cooling water reuse are explored. The cooling tower model is used to predict the thermal performance of the cooling towers. Two case studies are presented to illustrate the proposed technique. The first case resulted in nonlinear programming (NLP) formulation and the second case yield mixed integer nonlinear programming (MINLP). The nonlinearity in both cases is because of the bilinear terms present in the energy balance constraints. In both cases, the cooling towers operating capacity were debottlenecked without compromising the heat duties.
Description: Copyright: 2011 American Chemical Society. This is an ABSTRACT ONLY
URI: http://pubs.acs.org/doi/abs/10.1021/ie101395v
ISSN: 0888-5885
Appears in Collections:Pollution and waste
Water resources and human health
Advanced mathematical modelling and simulation
General science, engineering & technology

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