Configuration optimization of series flow double-effect water-lithium bromide absorption refrigeration systems by cost minimization

Mussati, Sergio F.; Cignitti, Stefano; Mansouri, Seyed Soheil; Gernaey, Krist V.; Morosuk, Tatiana; Mussati, Miguel C.

doi:10.1016/j.enconman.2017.12.079

Cited by 40 publications

(20 citation statements)

References 33 publications

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“…The mathematical model has been derived considering the following assumptions: (a) steady-state condition [12,19,35]; (b) no pressure drops and heat losses are taken into account [12,19,35]; (c) saturation condition for refrigerant streams that leave the condenser and evaporator [12,19]; (d) saturation condition for the diluted (weak) LiBr solution that leaves the absorber [12]; (e) the concentrated (strong) LiBr solutions leaving the generators are at equilibrium conditions [12]; and (f) isenthalpic process in expansion valves [19,35]. Each process unit is described by using a similar mathematical model presented by Mussati et al [32]. The list of assumptions and the complete mathematical model (mass and energy balances) here employed are provided as Supplementary Materials related to this article.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Since several nonlinear and non-convex constraints are present in the model and a local solver is used, it cannot be guaranteed that the obtained solutions correspond to the global optimum. However, based on the insights gathered from literature sources [2,5,32], the model was solved using different initial values obtaining the same solutions in all the cases. The latter forms a strong indication that the obtained solution is likely to correspond to the global optimum.…”

Section: Optimization Problem: Total Annual Cost (Tac) Minimizationmentioning

confidence: 99%

“…In this paper, a mathematical model of a double-effect system with series flow configuration presented by Mussati et al [32] is modified to consider another double-effect configuration, where the stream leaving the absorber is now split into two streams: one is passed through a solution heat exchanger (the low-temperature heat exchanger LTSHE) that is placed before the LTG, and the other is passed through another solution heat exchanger (the high-temperature heat exchanger HTSHE) that is placed before the HTG. The effectiveness factor of each solution heat exchanger is a model variable, thus making it possible to remove the corresponding solution heat exchanger, if beneficial according to the objective function that is optimized.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, improved cost-effective process configurations can be found. The cost model presented by Mussati et al [32] is employed. To the best of our knowledge, few articles deal with the simultaneous optimization approach presented in this work in order to take into account all the trade-offs existing between the model variables, which include both operation conditions and process unit sizes.…”

Section: Introductionmentioning

confidence: 99%

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Model-Based Cost Optimization of Double-Effect Water-Lithium Bromide Absorption Refrigeration Systems

et al. 2019

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This work presents optimization results obtained for a double-effect H2O-LiBr absorption refrigeration system considering the total cost as minimization criterion, for a wide range of cooling capacity values. As a model result, the sizes of the process units and the corresponding operating conditions are obtained simultaneously. In this paper, the effectiveness factor of each proposed heat exchanger is considered as a model optimization variable which allows (if beneficial, according to the objective function to be minimized) its deletion from the optimal solution, therefore, helping us to determine the optimal configuration. Several optimization cases considering different target levels of cooling capacity are solved. Among the major results, it was observed that the total cost is considerably reduced when the solution heat exchanger operating at low temperature is deleted compared to the configuration that includes it. Also, it was found that the effect of removing this heat exchanger is comparatively more significant with increasing cooling capacity levels. A reduction of 9.8% in the total cost was obtained for a cooling capacity of 16 kW (11,537.2 $·year−1 vs. 12,794.5 $·year−1), while a reduction of 12% was obtained for a cooling capacity of 100 kW (31,338.1 $·year−1 vs. 35,613.9 $·year−1). The optimization mathematical model presented in this work assists in selecting the optimal process configuration, as well as determining the optimal process unit sizes and operating conditions of refrigeration systems.

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Section: Mathematical Modelmentioning

confidence: 99%

Section: Optimization Problem: Total Annual Cost (Tac) Minimizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Model-Based Cost Optimization of Double-Effect Water-Lithium Bromide Absorption Refrigeration Systems

et al. 2019

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“…Significant research efforts on modeling, simulation, and optimization are currently being put towards overcoming these drawbacks. A literature review reveals that there are many publications addressing the simulation and optimization of double-effect VARSs employing different methodologies: exergy analysis [ 5 , 6 , 7 ], exergoeconomic analysis [ 8 , 9 ], evolutionary algorithms [ 5 , 10 ], and rigorous optimization algorithms [ 11 , 12 ]. Arshad et al [ 5 ] optimized the operating conditions to maximize the exergy efficiency of series and parallel flow double-effect H 2 O-LiBr VARS configurations.…”

Section: Introductionmentioning

confidence: 99%

Superstructure-Based Optimization of Vapor Compression-Absorption Cascade Refrigeration Systems

Mussati

Morosuk

Mussati

2020

Entropy

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A system that combines a vapor compression refrigeration system (VCRS) with a vapor absorption refrigeration system (VARS) merges the advantages of both processes, resulting in a more cost-effective system. In such a cascade system, the electrical power for VCRS and the heat energy for VARS can be significantly reduced, resulting in a coefficient of performance (COP) value higher than the value of each system operating in standalone mode. A previously developed optimization model of a series flow double-effect H2O-LiBr VARS is extended to a superstructure-based optimization model to embed several possible configurations. This model is coupled to an R134a VCRS model. The problem consists in finding the optimal configuration of the cascade system and the sizes and operating conditions of all system components that minimize the total heat transfer area of the system, while satisfying given design specifications (evaporator temperature and refrigeration capacity of −17.0 °C and 50.0 kW, respectively), and using steam at 130 °C, by applying mathematical programming methods. The obtained configuration is different from those reported for combinations of double-effect H2O-LiBr VAR and VCR systems. The obtained optimal configuration is compared to the available data. The obtained total heat transfer area is around 7.3% smaller than that of the reference case.

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Thermo‐economic optimization and comparison study of LiBr‐H ₂ O and LiCl‐H ₂ O working pair in absorption cooling systems based on genetic algorithm

Bhowmick

Kundu

2020

Int J Energy Res

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Summary The major intention of this study is to reduce the total expenditure of a vapor absorption cooling system (VACS) by developing an optimization model with an alternative working pair LiCl‐H2O and compares it with the traditional LiBr‐H2O system. Considering the cooling capacity of 50 kW, two working pairs were to compare parametrically at various operating conditions. The model comprises of three parts, viz. a thermodynamic model for the estimation of coefficient of performance, exergetic efficiency, and availability destruction of system components; an economic model for computing expenditure flow rate and capital investing expenditure rate; and the minimization of the total expenditure using genetic algorithm. The parametric study suggests that a LiCl‐H2O system performs better from both thermodynamic and expenditure‐effective aspects under all working conditions involved in this study. Especially, a low generator temperature produces a noticeable difference. The present global optimization technique assesses the optimal operating temperatures of generator, absorber, condenser, and evaporator. An optimal operating condition provides a system with a 1.20% of decrement in total expenditure rate and 5.39% of reduction in total capital investing expenditure rate using LiCl‐H2O solutions with respect to LiBr‐H2O solutions. Finally, results derived from this study may assist to designers to choose an alternative working fluid for enhancing the performance of VACS.

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Configuration optimization of series flow double-effect water-lithium bromide absorption refrigeration systems by cost minimization

Cited by 40 publications

References 33 publications

Model-Based Cost Optimization of Double-Effect Water-Lithium Bromide Absorption Refrigeration Systems

Model-Based Cost Optimization of Double-Effect Water-Lithium Bromide Absorption Refrigeration Systems

Superstructure-Based Optimization of Vapor Compression-Absorption Cascade Refrigeration Systems

Thermo‐economic optimization and comparison study of LiBr‐H ₂ O and LiCl‐H ₂ O working pair in absorption cooling systems based on genetic algorithm

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Configuration optimization of series flow double-effect water-lithium bromide absorption refrigeration systems by cost minimization

Cited by 40 publications

References 33 publications

Model-Based Cost Optimization of Double-Effect Water-Lithium Bromide Absorption Refrigeration Systems

Model-Based Cost Optimization of Double-Effect Water-Lithium Bromide Absorption Refrigeration Systems

Superstructure-Based Optimization of Vapor Compression-Absorption Cascade Refrigeration Systems

Thermo‐economic optimization and comparison study of LiBr‐H 2 O and LiCl‐H 2 O working pair in absorption cooling systems based on genetic algorithm

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Thermo‐economic optimization and comparison study of LiBr‐H ₂ O and LiCl‐H ₂ O working pair in absorption cooling systems based on genetic algorithm