A new stage-wise superstructure for heat exchanger network synthesis considering substages, sub-splits and cross flows

Pavão, Leandro V.; Costa, Caliane Bastos Borba; Ravagnani, Mauro A.S.S.

doi:10.1016/j.applthermaleng.2018.07.075

Cited by 43 publications

(36 citation statements)

References 32 publications

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“…The equations in the mathematical model are presented here in a sequential order as they are executed by the algorithm when calculating the objective function. The equation set (1)- (12) refers to the modeling used when the algorithm uses individual inlet and discharge temperatures for pressure changer units as decision variables. The s and p indexes concern the streams and their passes through heat recovery stage.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…, = exp (ln( , ) − − 1 (ln( , ) − ln( , )), ∈ , ∈ , ≤ − 2 (12) where TrevoutC and TrevoutT are discharge temperatures considering reversible compression and expansion processes, ηc and ηt are isentropic efficiencies for compressors and turbines and κ is the polytropic exponent. Note that these equations are valid for p < P -2.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Note that for p = P -1, Tunitins,p may differ from the pre-defined set according to Eqs. ( 9)- (12).…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Concepts developed in these simultaneous models serve as basis to recent efforts in automated HEN synthesis, such as the stagewise superstructure with sub streams, substages and crossflows [12], the stageless superstructure [13] and the non-structural model [14].…”

Section: Introductionmentioning

confidence: 99%

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A pinch-based method for defining pressure manipulation routes in work and heat exchange networks

Pavão

Ravagnani

Costa

2020

Renewable and Sustainable Energy Reviews

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Academic attention to work and heat integration (WHI) has grown in the last decade.Simultaneous models for work and heat exchanger network (WHEN) synthesis often derive from heat integration (HI) frameworks. However, it can be noted that the solution of simultaneous optimization models for WHI is considerably more complex than in the HI case. The design of efficient pressure manipulation routes (i.e., allocation and sizing of compression and expansion machinery) in process streams prior to heat exchange match allocation can make the optimization procedure more efficient. This work proposes a systematic procedure based on a model that employs Pinch Analysis concepts for defining these routes based on capital and operating cost targets. The solution approach is a hybrid meta-heuristic method based on Simulated Annealing (SA) and Particle Swarm Optimization (PSO). The obtained routes are then converted into a HI problem by fixing pressure changer sizes. The detailed HI solution is finally transferred into a WHI optimization model as initial design. In the two tackled examples, the total annual costs (TAC) predicted by the Pinch-based model differed in 0.5% and 1.2% from the final optimized WHEN obtained in the detailed WHI framework.

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Section: Mathematical Modelmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

“…Note that for p = P -1, Tunitins,p may differ from the pre-defined set according to Eqs. ( 9)- (12).…”

Section: Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A pinch-based method for defining pressure manipulation routes in work and heat exchange networks

Pavão

Ravagnani

Costa

2020

Renewable and Sustainable Energy Reviews

Self Cite

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“…[ 8 ] Networks featuring cross flows have been synthesized using, for example, the hyperstructure model, [ 9 ] exchanger‐centric superstructure model, [ 10 ] and sub‐staged model based on the stage‐wise superstructure (SWS) model. [ 11 ] Another option involves splitting of substreams into sub‐split branches as presented by Pavão et al, [ 12 ] where the SWS model is used but with substages added. The drawback of incorporating cross flows and sub‐splits in HENs with regard to industrial applicability is the need for additional flow controllers for substreams.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of stream‐split heat exchanger networks using non‐structural model considering serial equipment in stream branches and submixing of substreams

Kayange

Cui

et al. 2021

Can J Chem Eng

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This paper proposes a non‐structural model with stream splits, for heat exchanger network (HEN) synthesis, that allows for submixing of substreams within splits and series connection of exchanger units in a substream. In a submix, one substream totally combines with another non‐isothermally, and by allowing this feature, the designer incurs only piping costs, which are significantly low compared to other HEN costs, and benefits from increased possibility of manipulating substream temperatures. An algorithm employing random walk principles and compulsive evolution is applied for HEN optimization. The method's randomness, which enhances its explorative searching power and efficiency, is an attractive property that matches the proposed model. Four case studies from the literature are solved and annual cost savings of $1800, $7769, and $4771/year are achieved for three of them in comparison with published best solutions, attesting to the effectiveness of the proposed model.

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Globally optimal synthesis of heat exchanger networks. Part II: Non‐minimal networks

et al. 2020

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In Part I of this work, the synthesis of minimal heat exchanger networks using the isothermal mixing stage‐wise superstructure was presented. In this Part II, an extension of the algorithm presented in Part I is made to consider networks that allow multiple solutions regarding heat allocation, that is, they have energy loops where heat loads can be rearranged without changing the overall energy consumption. We extend the strategy of our Part I to use a set of nested loops to enumerate the number of units, the structure of matches, the energy consumption, different values of exchanger minimum approximation temperature (EMAT), and different locations where EMAT is active. All the models used are linear and are aided by capital cost evaluations. As in Part I, we claim global optimality based on our conjectures. Literature examples are solved to show the effectiveness of the algorithm.

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A new stage-wise superstructure for heat exchanger network synthesis considering substages, sub-splits and cross flows

Cited by 43 publications

References 32 publications

A pinch-based method for defining pressure manipulation routes in work and heat exchange networks

A pinch-based method for defining pressure manipulation routes in work and heat exchange networks

Synthesis of stream‐split heat exchanger networks using non‐structural model considering serial equipment in stream branches and submixing of substreams

Globally optimal synthesis of heat exchanger networks. Part II: Non‐minimal networks

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