Simultaneous Water and Energy Saving in Cooling Water Networks Using Pinch Approach
2019; Elsevier BV; Volume: 13; Linguagem: Inglês
10.1016/j.matpr.2019.04.079
ISSN2214-7853
AutoresMustapha Souifi, Ahmed Souissi,
Tópico(s)Chemistry and Chemical Engineering
ResumoRecirculating cooling water system is the most common practice used for rejection of waste heat to environment. The fresh cooling water is distributed directly without reuse via a heat exchanger networks in parallel configuration to provide cooling duties for hot process stream. Under this configuration, thewater returns to cooling tower with high heat capacity flow rate and low temperature. These conditions will lead to poor performance of cooling tower.In this paper, process integration approach based on Pinch analysis technique used to address energy efficiency issues in cooling water networks for retrofit design problem. The Demand-Composite Analysisis an analytical approach requiring no graphical procedures developed in this work to target simultaneously, prior to the detailed network design, the minimum heat capacity flow rate of fresh cooling water and the maximumtemperature of waste cooling water to maximize the efficiency of cooling tower.The key basis for this methodology is the conversion of the cooling duties to its equivalent demand and source pairs.Agraphical representation called Demand-Composite Curveis then generated to understand the targeting philosophy. To synthesize a network that achieves the target values, the construction ofTemperature Diagram is also proposed as a design methodology for maximum reuse of cooling water.A case study is treated to illustrate the practicability of this approach.
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