Exergy Destruction Cost Rate Research Articles

A novel combination of absorption heat transformer and refrigeration for cogenerating cooling and distilled water: Thermoeconomic optimization

A novel cogeneration system consisting of an absorption heat transformer and refrigeration system integrated with a water desalination system is proposed, analyzed, and optimized. The cogeneration and desalination systems interacted thermally. The proposed system is flexible in producing cooling and distilled water with variable fractions. Influences on system performance are investigated of the decision parameters. A maximum value of 39 °C is achieved for gross temperature lift. Also, it is observed that the condenser temperature, which is influenced by climate conditions, affects system performance. The system performance is optimized considering such criteria as exergy efficiency, the rate of distilled water production, and total product unit cost. Depending on the criteria used for optimization, the results indicate a minimum total product unit cost of 42.6$/GJ, a maximum exergy efficiency of 27.9%, and a maximum distilled water mass flow rate of 0.53 kg/s. The minimum total capital cost rate and exergy destruction cost rate are found to be 11 $/h and 3.89 $/h, respectively. Under optimized conditions, the generator is seen to contribute the most to the total exergy destruction rate. The values of levelized cost of energy and water and payback period are 0.013 $/kWh, 9 $/m3 and 1.8 year, respectively.

Completely Recuperative Supercritical CO2 Recompression Brayton/Absorption Combined Power/Cooling Cycle: Performance Assessment and Optimization

Excessive heat losses and water consumption in cooling units are significant constraints restricting the application circumstances and performances for the SCO2 Brayton cycle, and the heat exchange capacity in the precooler (PRC) is typically 1.5 times that of power generation. Therefore, this research offers a high-integrated combined power/cooling system in which two waste heat exchangers (WHEs) and a rectifier (RET) are used instead of the PRC to achieve 100% exhaust heat recovery. Each component’s energy and exergy models are developed, and the operational characteristics, coupling relationships, and exergy destruction distribution are examined. Results indicate that, when compared to the Brayton cycle, the thermal and exergy efficiency is considerably increased, and the concentration difference and WHE1 pitch point difference have significant influences on system performance. Further exergoeconomic and optimization analysis reveals that the superior exergy case is mostly recommended for relevant thermal and exergy efficiency increasing rates of 13.7% and 9.17%, respectively, and the unit cost is 81.33% that of the base case. Turbine 1 (TUR1) and main compressor (MCP) are the first and second highest cost rates, respectively, and RET and generator (GEN) account for roughly 34% exergy destruction rate and 20% exergy destruction cost rate, respectively. In addition, reducing heat transfer differences in relevant equipment can further promote system performance.

Advanced exergy and exergo-economic analyses of a novel combined power system using the cold energy of liquefied natural gas

In this study, a new combined power system using the cold energy of liquefied natural gas (LNG) is designed. Conventional and advanced exergy and exergo-economic analyses of the system were made. According to the research in the literature, for the first time, advanced exergo-economic analysis was applied to a combined power system using the cold energy of LNG with the Modified Productive Structure Analysis (MOPSA) method. 23% of the exergy destruction and exergy destruction cost rate of the combined system is avoidable. In both conventional and advanced exergy analysis, the highest exergy destruction and cost rate were found in the parabolic solar collector. In addition, as a result of the analyses, it has been seen that the most effective main system components with the potential to improve the performance of the combined system are the parabolic solar collector, the turbine in direct expansion cycle and the turbine in the Organic Rankine cycle, respectively. The study revealed that there is potential to improve the performance of the proposed combined power system.

Exergy and exergoeconomic assessment of sustainable light olefins production from an integrated methanol synthesis and methanol-to-olefins system

Integrated methanol synthesis and methanol-to-olefins systems are considered attractive and promising technologies to produce light olefins from syngas derived from biomass feedstock. In this study, a flowsheet model of a proposed system was developed and employed for system design and analysis. The system consists of four main parts: methanol synthesis, methanol-to-olefins process, olefins separation, and power plant. The effects of important operating parameters on the exergy efficiency were investigated to determine the optimal operating conditions to achieve the maximum exergy efficiency of this system. The results indicate that the methanol synthesis process should be operated at temperature, pressure, and recycling ratio of 250 °C, 150 bar, and 0.85, respectively, whereas the methanol-to-olefins process should be operated at a temperature of 480 °C and the power plant should be run at steam temperature and steam pressure of 650 °C and 50 bar, respectively. Heat integration based on a pinch analysis was subsequently performed to improve the system energy usage, resulting in a 9.29% increase in the exergy efficiency of the integrated system. An exergoeconomic analysis of the integrated system with the designed heat exchanger network was performed. The results show that the power plant has the highest cost rate of exergy destruction and total cost rate. Moreover, the syngas feedstock cost has the greatest impact on the exergoeconomic indicators; it is necessary to minimize this cost to achieve economic viability of the process for industrial use. The production of light olefins from the integrated methanol synthesis and methanol-to-olefins system using a renewable syngas feedstock has a potential to reduce greenhouse gas emissions due to the use of renewable sources replacing fossil sources.

Development and optimization of a multigeneration geothermal and solid-oxide fuel cell-based integrated system with carbon capturing

• Exergoeconomic analysis of an integrated system with carbon capturing is performed. • The unit costs of the useful outputs of the integrated system are evaluated. • The exergoeconomic parameters of the integrated system are investigated. • An optimization study to minimize the exergy losses and unit costs is undertaken. This work presents the exergoeconomic analysis and assessment of a recently developed integrated system for the multigeneration of electrical power, space heating, freshwater, and ammonium bicarbonate. The last chemical commodity is used as a method of carbon capturing and utilization method. This type of analysis is important because it shows the economic feasibility of integrated systems for power production with carbon capture and utilization features. This helps attract the power industry decarbonize in an economic way. The integrated system is modeled using the energy, exergy, and then the exergoeconomic analysis tools for investigating this system in terms of its thermodynamic and economic performance. Furthermore, the integrated system is studied using a multi-objective optimization method to find the Pareto front where the overall exergy destruction rate and the overall unit cost of product are mutually minimized. The results of this study show that the ammonium bicarbonate is produced with a cost rate of 2.02 × 10 -2 $ s −1 , and the overall unit cost of product is 2.38 × 10 -3 $ kJ −1 . The overall exergy destruction cost rate and the overall exergoeconomic factor are evaluated to be 0.79 $ s −1 , and 2.97%, respectively. Moreover, the multi-objective optimization study has produced an optimum point where has an overall exergy destruction rate of 1.62 × 10 4 kW and an overall unit cost of product of 2.42 × 10 -3 $ kJ −1 . The cost of producing ammonium bicarbonate is only 16% of the market price for this chemical commodity which indicates an economic feasibility of this carbon capturing and utilization system.

An integrated energy storage system consisting of Compressed Carbon dioxide energy storage and Organic Rankine Cycle: Exergoeconomic evaluation and multi-objective optimization

In this paper, an integrated energy storage system consisting of Compressed Carbon dioxide Energy Storage (CCES) and Organic Rankine Cycle (ORC) was proposed. Four criteria (system exergy efficiency, total cost rate of exergy destruction, total product unit cost, and total exergoeconomic factor) were defined to evaluate the system performance from exergy and exergoeconomic points of view. The influence of key parameters on system performance was analyzed, and multi-objective optimization of the system was conducted. The results showed that for the base case, the net power output, system exergy efficiency, and total product unit cost were 27.736 MW, 66.64%, and 20.34 $/GJ, respectively. Recuperator had the largest exergy destruction (39.17% of the total exergy destruction) and a higher value of investment cost rate, signifying its necessity of optimization. Sensitivity analysis demonstrated the monotonic effects of compressor inlet temperature, turbine inlet temperature, and minimum temperature difference in heat exchangers on system performance, but for pressure ratio or pump2 outlet pressure, there was an optimal value for the system performance within the range of values studied. Finally, multi-objective optimization recommended a 72.6% for system exergy efficiency, 452.35 $/h for total cost rate of exergy destruction, and 18.49 $/GJ for total product unit cost.

Simulation and exergoeconomic analysis of the syngas and biodiesel production process from spent coffee grounds

The integrated production of biofuels from agro-industrial wastes is increasing around the world. The thermodynamic performance and economic analysis of these processes have become topics of interest given the need to reduce the cost of biofuels and their impact on the environment. This study develops a simulation of the production process of syngas and biodiesel from spent coffee grounds, and an exergoeconomic analysis that mainly determines the exergy destruction rate, the investment and operational cost rate, and the exergy destruction cost rate at component level and for the overall system. The total investment cost for the integrated process resulted in 13.2 million dollars. The specific cost of syngas and biodiesel from spent coffee grounds were estimated in $0.36/kg and $0.71/kg, respectively. The results show that the drying process including the air heating for the pretreatment of the biomass had an exergy destruction rate of 11,463 kW and was responsible of the 92% of the overall exergy destruction cost rate. An increment of the dead state temperature reduced the specific cost of syngas and biodiesel in 17% and 8%, respectively. Future studies should focus on the exergoeconomic optimization of the drying process of biomass in order to minimize the operational costs.

Optimal equipment arrangement of a total site for cogeneration of thermal and electrical energy by using exergoeconomic approach

The optimal equipment arrangement for a system for cogeneration of thermal and electrical energy for a total site is determined with exergoeconomic analysis. A steam power plant can operate concurrently in a dual-use mode producing steam and electricity. It is important to know the potential for cogeneration before designing and optimizing a central utility system in order to establish on site fuel demand targets. In the current study, two case studies with different backpressure steam turbines arrangement are considered and, if extra power generation is needed, designs with a system of condensing and gas turbines are examined. The minimum exergy destruction rate, maximum exergy efficiency, minimum total capital cost rate and minimum exergy destruction cost rate for these arrangements are investigated with exergoeconomic analysis. Finally, selected backpressure steam turbines arrangement in conjunction with the gas turbine system are introduced for finding the optimum arrangement of the cogeneration system in the total site with an exergoeconomic approach.

Multi-generation energy system based on geothermal source to produce power, cooling, heating, and fresh water: Exergoeconomic analysis and optimum selection by LINMAP method

The current study deals with thermodynamic modeling and multi-objective optimization of a new multi-generation energy system using geothermal as the primary energy source. The proposed system includes a Kalina cycle, a refrigeration unit, thermoelectric module, steam turbine, and heating unit. The new aspects of the proposed system are using the thermoelectric system to low temperature heat recovery and using the benefit of the multi-product. The system exergy analysis shows that the reverse osmosis desalination unit with 449.1 kW has the highest exergy destruction rate in the system. Additionally, three components i.e., reverse osmosis unit, heating system, and steam turbine are responsible for 82.8% of exergy destruction of the system. Exergo-economic analysis revealed that the turbine and the thermoelectric module have the highest cost rates of 12.51 US$/h and 3.62 US$/h respectively. It also concludes that the sum of the cost rate of component and associated exergy destruction cost rate, a significant exergo-economic parameter, for the turbine and reverse osmosis unit are the highest values. Parametric analysis of the proposed system for geothermal source pressure, steam turbine backpressure, Kalina turbine backpressure, and ammonia mass fraction of basic solutions are carried out. The unit cost of product and exergy efficiency are objective functions for optimization. Multi-criteria optimization indicates that using the Linear Programming Technique for Multidimensional Analysis of Preference (LINMAP) method based on suggested design variables, can reduce the unit cost of the product to 0.107 US$/kWh, and the exergy efficiency can be increased up to 15.86%.

Thermodynamic and exergoeconomic analysis of a novel solar-assisted multigenerational system utilizing high temperature phase change material and hybrid nanofluid

The goal of this article is to propose and analyze a novel solar driven multigenerational system producing electricity, cooling, hydrogen and fresh water. The system consists of parabolic dish collector with hybrid nanofluids, re-compression sCO2 Brayton cycle, proton exchange membrane (PEM) electrolyzer, desalination unit and double effect lithium-bromide/water absorption cycle. To achieve high system performance and to meet the energy demand in the absence of solar flux, a thermal energy storage system has been used having high temperature phase change material (PCM). This system is able to continue system operation after the sunset and also ensure the stable fluid temperature at the turbine inlet. The performance of the proposed system is assessed by varying the different input parameters such as; inlet temperature, mass flow rate, direct normal irradiation (DNI), wind speed and turbine inlet temperature (TIT). In addition to the energy and exergy analysis, exergoeconomic approach is used to calculate the cost rate and exergo-economic factor of all the components of the integrated system. The results indicate that the overall energy and exergy efficiencies of the proposed system are 31.59% and 30.02%, respectively; while production of fresh water and cooling load are 1.564 kg/s and 196.1 kW, respectively. The exergoeconomic results show that Levelised cost of electricity and total cost rate of exergy destruction are 0.1387 $/kWh and 530 $/hr., respectively with payback period of 9.5 years. Moreover, single- and multi-objective optimizations are carried out to determine the optimal design using a genetic algorithm method in EES (engineering equation solver). Total cost rate and overall exergy efficiency are the two desired objectives to be optimized.

Thermoeconomic assessment of a geothermal based combined cooling, heating, and power system, integrated with a humidification-dehumidification desalination unit and an absorption heat transformer

Population growth, economic challenges, and the environmental crisis force scientists and designers to pay more attention to clean, sustainable, and renewable-based energy systems. In this regard, due to the unlimited geothermal potential in many countries, the geothermal energy resource can be an economical alternative. Therefore, in the present work, a novel multi-generation system, based on a 100% geothermal resource, for power, cooling, heating, and desalination has been designed and analyzed, thoroughly. The system is evaluated from the energy, exergy, and thermo-economic viewpoints, and providing high heating/cooling potentials while reducing the thermoeconomic indexes is the major achievement of this study. The results demonstrate that the system's net power output, freshwater production rate, heating, and cooling capacities are 78.47 kW, 92.1 m3/day, 6251 kW, and 4991 kW, respectively. Moreover, the highest amount of exergy destruction occurs in the absorption heat transformer (42%) and the absorption chiller (35%), respectively. In addition, the chiller’s absorber has the highest cost rate of exergy destruction, and the turbine and the evaporator of the organic Rankine cycle have the highest investment costs. It is found that energy and exergy efficiencies are 60.55% and 17.05%, respectively for summer, and 70.58% and 43.59%, respectively for winter, and the system's total cost rate is 44.12 $/h with the payback period of 5.63 years. Furthermore, the parametric study shows that increasing the ambient temperature and decreasing the terminal temperature difference of the heat transformer’s evaporator lead to higher exergy efficiency and lower total system cost rate.

Advanced exergoeconomic analysis with using modified productive structure analysis: An application for a real gas turbine cycle

In this study, advanced exergoeconomic analysis is performed for a gas turbine cycle located in Inchon/South Korea. In addition, an approach combining advanced exergy analysis with modified productive structure analysis is applied to the system and the results are compared. Both methods showed that higher part of exergy destruction cost rate for overall system was unavoidable. The investment cost rate of system equipment was also unavoidable. Avoidable exergy destruction cost rate was higher than unavoidable part only for gas turbine. The exergy destruction cost rates obtained with approach are considerably lower than the results obtained with the advanced exergoeconomic analysis. This situation affected the strategies developed to obtain a cost-effective system for gas turbine. Advanced exergoeconomic analysis proposed reducing the exergy destruction cost rate for gas turbine. However, for gas turbine, the approach proposed reducing the investment cost rate. The sum of exergy destruction cost rate of system equipment was higher than that of overall system in advanced exergoeconomic analysis. However, the exergy destruction cost rate of overall system was equal to the sum of exergy destruction cost rate of system equipment in the approach. Finally, it can be concluded that the results obtained with the approach were more compatible.

Proposed a new geothermal based poly-generation energy system including Kalina cycle, reverse osmosis desalination, elecrolyzer amplified with thermoelectric: 3E analysis and optimization

One of the most appropriate approaches for enhancing the performance of the energy systems is integrating different subsystems for producing various beneficial products simultaneously. In the present study, a poly-generation system including a Kalina cycle, a reverse osmosis unit, a PEM electrolyzer, and a thermoelectric module that can generate power, fresh water, hot water, and hydrogen is examined. A thermodynamic simulation code in Engineering Equation Solver (EES) is prepared to predict the behavior of system. Using the exergy analysis different location of system with high irreversibility is determined. As the results show in the base case, the geothermal cycle condenser with 89.29 kW, reverse osmosis (RO) unit with 68.97 kW, heat exchanger 2 with 37.68 kW, and steam turbine with 22.52 kW have the highest exergy destruction rate respectively. The parametric analysis for identifying the influence of five decision variables namely steam turbine inlet pressure (P2), steam turbine back pressure (P4), vapor generator outlet pressure (P10), Kalina turbine backpressure (P13), and temperature difference of the heat exchanger (TD) is conducted. Additionally four major outputs consisting of exergy destruction rate (kW), exergy destruction cost rate ($/h), and electricity cost rate ($/h) are determined for implementing multi-criteria optimization. A tri-objective optimization to find the optimum states of the suggested system is conducted. With employing a selection method, the system arrangement with 328.2 kW of exergy destruction rate, 18.4 $/h of exergy destruction cost rate, and 12.83 $/h of electricity cost rate with determined value of decision variables is selected as final optimum state.

A novel multi-generation energy system based on geothermal energy source: Thermo-economic evaluation and optimization

A multi-generation system including an absorption chiller, an organic flash cycle, a concentrated photovoltaic module, a reverse osmosis unit, and thermoelectric modules are integrated to produce cooling, heating, electrical power, and freshwater. The important parameters including energy efficiency, exergy efficiency, exergy destruction rate, net output power, and electrical cost rate are identified. The behavior of main outputs are examined with varying decision variables namely geothermal temperature, flash vessel inlet pressure, and pump Ι outlet pressure. Thermal modeling of the proposed system indicates that the energy efficiency, exergy efficiency, and net output power are 5.46%, 20.16%, and 70.85 kW higher than the conventional system. Moreover, exergo-economic outputs demonstrate that the thermoelectric generator module with 11.34 $/h and heat exchanger 2 with 8.98 $/h have the maximum exergy destruction cost rate. Finally, according to different multi-objective optimization scenarios it is found that through the first scenario, the electricity cost rate shows the minimum value of 108.4 $/h.

Exergy and exergoeconomic analysis of domestic scale solar water heater by the effect of solar collector area

The increased usage and demand for non-renewable resources cause several environmental pollutions. Solar energy is well-renowned renewable energy, which is clean and can provide a long-term sustainable solution for the wicked problem. The solar water heater is the most popular solar energy utilization technique because of its simpler technology and economic feasibility. This article presents the exergey analysis of solar water heaters. Exergy is the maximum useful energy that is available in a system. Exergy analysis focuses on the quality of the energy instead of the quantity of the energy. The three-procedure theory demonstrates the exergy flow within a solar water heater. The three procedures include conversion, utilization, and recycling procedure. In this research, the exergy efficiency of the solar water heater has been evaluated. The effect of different solar collector area on the exergy efficiency was also identified. Other than exergy analysis, this research further analysed the exergoeconmics of solar water heaters. Exergoeconomic analysis is a technique that utilizes exergy analysis to determine the cost of the output product. Exergoeconomic analysis supports identifying the cost rate of exergy destruction. It was found that the exergy efficiency of the solar water heater is very low (2–3%). The results showed that the increase in solar collecting area would decrease the solar water heater’s exergy efficiency. Moreover, it was found that the cost rate of exergy destruction is greater when larger solar collector areas are used.

An Advanced Exergoeconomic Comparison of CO2-Based Transcritical Refrigeration Cycles

CO2-based transcritical refrigeration cycles are currently gaining significant research attention, as they offer a viable solution to the use of natural refrigerants (e.g., CO2). However, there are almost no papers that offer an exergoeconomic comparison between the different configurations of these types of systems. Accordingly, the present work deals with a comparative exergoeconomic analysis of four different CO2-based transcritical refrigeration cycles. In addition, the work is complemented by an analysis of the CO2 abatement costs. The influences of the variation of the evaporating temperature, the gas cooler outlet temperature, and the pressure ratio on the exergy efficiency, product cost rate, exergy destruction cost rate, exergoeconomic factor, and CO2 penalty cost rate are compared in detail. The results show that the transcritical cycle with the ejector has the lowest exergetic product cost and a low environmental impact.

THERMOECONOMIC ANALYSIS OF T56 TURBOPROP ENGINE UNDER DIFFERENT LOAD CONDITIONS

In this study, T56 turboprop engine was theoretically modelled for 75% load, 100% load, military (MIL) mode, and Take-off mode conditions. For each load conditions, thermoeconomic analyses of T56 turboprop engine were performed to allocate the unit costs of shaft work and thrust and to determine exergy destruction cost rates for system equipment. In thermoeconomic analyses, Specific Exergy Costing (SPECO) and Modified Productive Structure Analysis (MOPSA) methods were used. MOPSA method gave higher unit cost values for shaft work and thrust compared to SPECO method. As a result, for Take-off mode, the unit cost of shaft work transferred to propeller was determined to be 78.87 $/GJ in SPECO method, while this value was calculated to be 84.68 $/GJ with MOPSA method. The unit cost of negentropy of T56 turboprop engine decreased with increasing in engine load and ranged from 14.98 $/GJ to 11.08 $/GJ. The exergy destruction cost rates obtained with MOPSA method for the system equipment were considerably lower than the results obtained with SPECO method. For instance, in Take-off mode, exergy destruction cost rate of combustion chamber was calculated to be 865.10 $/h in SPECO method, whereas it was calculated to be 247.94 $/h in MOPSA method. The exergoeconomic factor of overall system was determined to be 23.07% in SPECO method, and 54.16% in MOPSA method for Take-off mode

Conventional and Advanced Exergy and Exergoeconomic Analysis of a Spray Drying System: A Case Study of an Instant Coffee Factory in Ecuador

Instant coffee is produced worldwide by spray drying coffee extract on an industrial scale. This production process is energy intensive, 70% of the operational costs are due to energy requirements. This study aims to identify the potential for energy and cost improvements by performing a conventional and advanced exergy and exergoeconomic analysis to an industrial-scale spray drying process for the production of instant coffee, using actual operational data. The study analyzed the steam generation unit, the air and coffee extract preheater, the drying section, and the final post treatment process. The performance parameters such as exergetic efficiency, exergoeconomic factor, and avoidable investment cost rate for each individual component were determined. The overall energy and exergy efficiencies of the spray drying system are 67.6% and 30.6%, respectively. The highest rate of exergy destruction is located in the boiler, which amounts to 543 kW. However, the advanced exergoeconomic analysis shows that the highest exergy destruction cost rates are located in the spray dryer and the air heat exchanger (106.9 $/h and 60.5 $/h, respectively), of which 47.7% and 3.8%, respectively, are avoidable. Accordingly, any process improvement should focus on the exergoeconomic optimization of the spray dryer.

A specific exergy costing assessment of the integrated copper-chlorine cycle for hydrogen production

In this study the specific exergy costing (SPECO) approach is employed on a four-step integrated thermochemical copper-chlorine (Cu Cl) cycle for hydrogen production for a second-law based assessment purposes. The Cu–Cl cycle is considered as one of the most environmentally benign and sustainable options of producing hydrogen and is thus investigated in this study due to its potential of ensuring zero greenhouse gas (GHG) emissions. Several conceptual Cu–Cl cycles have been exergoeconomically examined previously, however this study aims at investigating the four-step integrated Cu–Cl cycle developed at the Clean Energy Research Laboratory (CERL) at the Ontario Tech University thereby contributing to the thermo/exergoeconomic assessments of the thermochemical hydrogen production. In this study, the cycle is first thermodynamically modeled and simulated in a process simulation software (Aspen Plus) through exergy and energy approaches. The basic principles of the SPECO methodology are applied to the system and exergetic cost balances are performed for each cycle component. The exergetic costing of each cycle stream is then performed based on the cost balance equations. The purchased equipment cost and the hourly levelized capital cost rates for each cycle component is also obtained. The exergoeconomic factor, relative cost difference and exergy destruction cost rate for various cycle components are also evaluated. Moreover, the effect of several parameters on the total and hourly levelized capital cost rates is analyzed by performing a comprehensive sensitivity analysis. Based on the analysis, the exergy cost, the unit or specific exergy cost, and the unit costs of hydrogen are evaluated to be 6407.55 $/h, 0.042 $/MJ, and 4.94 $/kg respectively.

Comparative analysis and multi-criteria optimization of a supercritical recompression CO2 Brayton cycle integrated with thermoelectric modules

Regarding the high expense of the exploiting energy from energy resources, each innovation or modification on the energy systems with the aim of enhancing the efficiency and affordability is so valuable. Along with this fact, in the present work, the effects of employing thermoelectric (TEG) unit in a recompression Brayton cycle ( $${\text{sCO}}_{2}$$ -reB/TEG) are examined. The results of thermodynamic modeling represents that adding the thermoelectric to the system in the s $${\text{CO}}_{2}$$ -reB can improve the net output power about 2.41 kW and increase the first and second law efficiency of s $${\text{CO}}_{2}$$ -reB/TEG system about 1.09% and 1.12% in comparison with s $${\text{CO}}_{2}$$ -reB system. Additionally the exergo-economic analysis for s $${\text{CO}}_{2}$$ -reB/TEG revealed that the reactor and turbine II should be considered more than other elements from exergo-economic point of view since the highest values of $$\dot{Z}_{\rm k} + \dot{C}_{\rm D,k}$$ belong to these components. After identifying the important parameters as well as evaluating system from thermodynamic and economic aspects, a multi-objective optimization is implemented on the $${\text{sCO}}_{2}$$ -reB-TEG system for determining the optimum conditions. Two optimization scenarios are defined using the results of parametric analysis. Multi-objective optimization with first scenario results in total cost rate of 1.6 $ h−1 and total exergy efficiency of 0.5 in minimum temperature, maximum temperature and compression ratio of 36.17 °C, 577.15 °C and 1.6. Furthermore, for optimization based on second scenario results in total exergy destruction cost and exergy destruction rate of 3.04 $ h−1 and 435.85 kW in 48.75 °C, 569.77 °C and 3.44 for minimum temperature, maximum temperature and compression ratio.