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Title: Holistic approach for retrofit design of cooling water networks
Authors: Reddy, C.C.S.
Rangaiah, G.P. 
Wei Long, L.
Naidu, S.V.
Issue Date: 11-Sep-2013
Citation: Reddy, C.C.S., Rangaiah, G.P., Wei Long, L., Naidu, S.V. (2013-09-11). Holistic approach for retrofit design of cooling water networks. Industrial and Engineering Chemistry Research 52 (36) : 13059-13078. ScholarBank@NUS Repository.
Abstract: Optimization of closed-loop cooling water systems (CCWS) is essential to reduce operating and capital costs. These systems are generally designed with heat exchangers in parallel arrangement. Although this arrangement is easy to operate, it results in inefficient use of cooling tower capacity and incurs more capital and operating costs. Existing CCWS can be retrofitted by changing heat exchangers from parallel to series or series/parallel arrangement. Previous research on cooling water retrofit design is mainly focused on methods to reduce cooling water flow rate without considering cooling tower operation, pressure drops, and capital costs. With pressure drop and capital cost considerations, minimizing cooling water flow rate does not necessarily give the optimum savings. In the present paper, a holistic approach for retrofit design of CCWS involving multiple cooling towers and heat exchangers is presented by considering exchanger network pressure drops, cooling tower operation, and piping costs besides operating costs. A mixed-integer linear programming model is formulated to maximize the profit for retrofit design, by linearization of equations for piping and heat-exchanger pressure drop, piping cost, and operating cost of pumps and fans. In addition, a mixed-integer nonlinear programming model is presented for the retrofit design of a cooling water system, involving multiple cooling towers and heat exchangers, using one intermediate header. One detailed case study from a chemical plant is presented to demonstrate the potential benefits of using the proposed approach and models. © 2013 American Chemical Society.
Source Title: Industrial and Engineering Chemistry Research
ISSN: 08885885
DOI: 10.1021/ie4011645
Appears in Collections:Staff Publications

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