Exergoeconomic Viewpoints Research Articles

A comprehensive techno-eco-environmental investigation of an efficient biodiesel generation procedure through hydrodynamic cavitation

The growth of cleaner biodiesel generation associated with hydrodynamic cavitation from canola oil via transesterification is acquiring prominence owing to considerably descending energy needs and time. In this work, the conversion of canola oil into biodiesel and glycerol was achieved through the process of transesterification with methanol, employing sodium hydroxide as a catalyst. The newly offered process was investigated from technical, economic, and environmental points of view, and the precision of the results was verified and accepted compared to previously published works. The technical results revealed that the maximum exergy destruction rates as well as exergy efficiency belonged to the transesterification process. The economic study showed that the capital cost of the process was 638.7 MUSD/year. Also, the return period was computed less than 4 years. Moreover, comparison analysis proved that Canola oil proved to be a more advantageous primary material for the production of biodiesel and was more appropriate from the exergoeconomic point of view in comparison to Jatropha oil and other materials. Finally, by increasing the conversion percentage of the reactor, the value of the exergo-environmental index and the factor of exergy stability increased significantly, which was considered as an advantage from an environmental standpoint.

Performance investigation on a concentrating photovoltaic thermal system integrated with spectral splitter and absorption heat pump

To alleviate the energy consumption crisis and environmental pollutant problems, a concentrating photovoltaic thermal system integrated with spectral splitter and absorption heat pump is proposed. Through solar spectral splitting, the photo-electric and photo-thermal processes are decoupled, which facilitates the cogeneration of electricity and high-temperature heat. Through absorption heat pump, the temperature of geothermal energy is improved by high-temperature solar heat for subsequent utilization. Thus, the efficient utilization of full spectrum solar energy is achieved. To further evaluate the performances, an electric-thermal coupled model is developed and the comprehensive analysis is carried out from energy, exergy and exergoeconomic viewpoints. Results indicate that for an optical window of 400–1300 nm, strong LiBr/H2O solution concentration of 64 %, concentration difference of 5 % and thermal receiver temperature of 438.15 K, the overall energy and exergy efficiency is obtained about 102.14 % and 37.49 %, respectively. Among all components, parabolic trough concentrator is the most inefficient component with energy losses of 123.86 MWh. Highest exergy destruction is observed in the solar cell, accounting for 67.51 % of the total destruction. Moreover, a total exergoeconomic factor of 79.94 % is obtained for the entire system indicating that 20.06 % of the total costs are related to exergy destruction.

A comparative study on the integration of different types of supercritical CO2 with ORC using high-temperature heat source from energy, exergy, and exergoeconomic (3E) viewpoint

A comparative study on the integration of different types of supercritical CO2 with ORC using high-temperature heat source from energy, exergy, and exergoeconomic (3E) viewpoint

Comprehensive thermoeconomic study of a new solar thermosyphon-assisted multigeneration system

Nowadays, due to the global energy crisis, limited reservoirs of fossil fuels, and their negative environmental effects, the use of renewable energy sources and multigeneration systems have become good alternatives for conventional thermodynamic systems. One of these resources, whose technology has developed rapidly in recent years, is the use of solar energy for the simultaneous generation of various products. Therefore, in this research, a multigeneration system with several subsystems is introduced. The proposed system includes a solar energy collector to receive thermal energy, two thermal energy storage tanks, an organic Rankine cycle, and a Kalina cycle to generate electricity, a multi-effect distillation unit to produce fresh water, an electrolyzer to produce hydrogen, as well as heat recovery for hot water and hot air generation. In this multigeneration system, the cooling unit is designed with the help of a thermosyphon. The performance of the proposed system is studied from energy, exergy, environmental, and exergoeconomic viewpoints using Aspen HYSYS and EES software. The obtained results show that due to the addition of the thermosyphon unit to the refrigeration system, the exergy efficiency increases from 55.62% to 70.26%. As a result of this combination, the performance of the whole system is improved and the amount of costs are reduced. In addition, the parabolic collector system has the highest exergy destruction ratio, 39%, among the subsystems. Furthermore, the results of the exergoeconomic analysis indicate that the PEM water heater with 33.3% and the ejector with 22.7% own the highest cost destruction rates.

Analysis of Desalination Performance with a Thermal Vapor Compression System

Multi-effect distillation with thermal vapor compression (MED-TVC) is a highly energy-efficient desalination technology that can provide a reliable and sustainable source of high-quality water, particularly in areas with limited energy infrastructure and water resources. In this study, a numerical model based on exergoeconomic approach is developed to analyze the economic performance of a MED-TVC system for seawater desalination. A parallel/cross feed configuration is considered because of its high energy efficiency. In addition, a parametric study is performed to evaluate the effects of some operational parameters on the total water price, such as the top brine temperature, seawater temperature, motive steam flow rate, and number of effects. The obtained results indicate that the total water price is in the range of 1.73 USD/m3 for a distilled water production of 55.20 kg/s. Furthermore, the exergy destructions in the effects account for 45.8% of the total exergy destruction. The MED effects are also identified to be the most relevant component from an exergoeconomic viewpoint. Careful attention should be paid to these components. Of the total cost associated with the effects, 75.1% is due to its high thermodynamic inefficiency. Finally, the parametric study indicates that adjusting the top brine temperature, the cooling seawater temperature, the motive steam flow rate, and the number of effects has a significant impact on the TWP, which varies between 1.42 USD/m3 and 2.85 USD/m3.

Energy, exergy and exergoeconomic analysis and optimisation of the scale-up of a combined ammonia-water absorption pilot plant producing electricity and refrigeration

A low-temperature heat driven ammonia-water combined absorption cycle is studied in this paper from a thermodynamic and exergoeconomic point of view. The work is based on an absorption chiller prototype to which a partial admission turbine has been added in parallel to the cooling production line for the production of electricity.First, the performance of the pilot plant is analysed in the design point and in a base case characterised by a hot source temperature of 100 °C, intermediate source temperature of 25 °C and cold source temperature of 10 °C. Exergoeconomic performance is assessed for two different cost of the fuel thermal input. Being the small scale of the plant very penalising, the scale-up of the plant to a size 25 times bigger is evaluated. Unit cost of products in this case is strongly reduced, mainly because of the constant cost and increased efficiency of the turbine.Parametric studies are carried out on the temperature of the sources and on the size of components to assess how these parameters influence the performance of the cycle. Finally, an optimisation aiming at minimizing the unit cost of products is performed on the size of heat exchangers for the base case working point and fixing constant the size of the turbine. The optimised cycle layout allows reaching a unit cost of produced cooling of 10.14 $/GJ (0.036 $/kWh) and a cost of produced electricity of 40.45 $/GJ (0.145 $/kWh) if the cost of the thermal input is neglected. When a thermal input cost of 15 $/GJ is considered, the calculated cooling and electricity cost are 66.7 $/GJ (0.24 $/kWh) and 106.8 $/GJ (0.384 $/kWh) respectively. In both cases the optimal vapour split ratio between cooling and power production lines is found to be around 0.47.

A new combined power and dual ejector refrigeration system using zeotropic mixtures with composition adjustable driven by geothermal resource: An exergoeconomic performance evaluation

In this study, a novel geothermal-driven combined power and dual ejector refrigeration (CPDER) system using the zeotropic mixture as the working fluid with composition adjustable is presented, investigated, and assessed from an exergoeconomic viewpoint. The proposed system includes two ejector refrigeration subsystems connected in parallel mode. The zeotropic mixture is distributed into these subsystems through a vapor-liquid separator with various compositions. To represent the superiority of the proposed CPDER system compared to the conventional ones, a comprehensive parametric perusal is conducted. The results reveal that the mixture composition and outlet pressure of the turbine have the biggest impact on the total exergy destruction and the net power output, while the outlet temperature of the evaporator has the biggest effect on the refrigeration capacity. Furthermore, optimal operating condition is found through a tri-objective optimization process where energy efficiency, exergy efficiency, and overall unit cost of products are chosen as objective functions. The optimization results detect that for the proposed CPDER system, the energy efficiency and exergy efficiency improve by 6.0% and 11.9%, respectively. In this case, a decrement of 1.18 $/GJ (10.7%) is obtained in the overall unit cost of products compared to the conventional CPER system.

Thermoeconomic analysis and Multi-Objective optimization for the synthesis of green hydrogen and three different products via a novel energy system

• The simultaneous generation of the green hydrogen, methane, power, and drinking water were examined. • The offered plant was simulated in EES software based on exergoeconomic point of view. • Optimal operating point for the system was determined via multi-objective optimization. • The green hydrogen would be produced at a rate of 2.3 kg/h under well-balanced operating circumstances. • The exergy productivity was 12.76% and the total cost was 61.69 $/GJ at optimum conditions. This paper proposes an integrated energy conversion system relying on the parabolic trough solar collector field, a Rankine cycle, and a proton exchange membrane to generate green hydrogen and methane alongside power and freshwater. This study examines the power of effective variables on energy and economic factors before and after the integration of renewable energy sources. Simulating a system and obtaining the desired outcome is achieved by using an engineering equation solver. A genetic evolutionary algorithm code is used to find the optimal operating circumstance for the plant by applying a multi-criteria genetic evolutionary algorithm to the system. According to the results obtained from an energy standpoint, the exergy productivity is 12.76% and the total cost is 61.69 $/GJ at optimum operating conditions. Further optimization of the multi-objective optimization model shows that the optimum operating case, which is suitably-balanced among energy productivity and cost, has maximum energy productivity of 13.29% and a cost of 63.96 $/GJ, sequentially. Optimal working conditions are considered to correspond to exergy productivity of 10.01% and total cost of 60.21 $/GJ, sequentially. Further, hydrogen would be produced at a rate of 2.28 kg/h under well-balanced operating circumstances. A strong approach for optimizing the system operation and diminish total cost can be achieved by installing the condenser unit instead of the condenser.

A Comparative Assessment of Thermodynamic and Exergoeconomic Performances of Three Thermochemical Water-Splitting Cycles of Chlorine Family for Hydrogen Production

Hydrogen production processes utilizing hydrocarbon-based sources as feedstocks have severe environmental implications (when not incorporating carbon capturing and storage technology) in addition to resulting in depletion of non-sustainable naturally occurring fuel sources. In this regard, thermochemical water-splitting is an extremely environmentally benign pathway for obtaining sustainable hydrogen. Thus, this paper studies and comparatively evaluates three different thermochemical cycles of the chlorine family for hydrogen production which include iron-chlorine, copper-chlorine, and magnesium-chlorine cycles. Each cycle is first modeled and simulated in Aspen-plus and then analyzed from thermodynamic and exergoeconomic viewpoints. A thermodynamic and exergoeconomic performance comparison of the three thermochemical cycles is further performed in terms of their overall efficiencies, net heat input and rejection rates, exergy destruction rates, unit costs of hydrogen, hourly levelized cost rates, and cost rates of exergy destruction. All cycles are modeled and simulated by considering the incorporation of waste heat recovery from a steel plant and internal heat recovery within each cycle to improve the process efficiencies by reducing the overall thermal energy consumption. According to the performed analyses, the copper-chlorine cycle has the highest energy (79.7%) and exergy (81.1%) efficiencies followed by the iron-chlorine cycle (energy and exergy efficiencies of 48.8% and 49.6%, respectively) with the magnesium-chlorine cycle exhibiting the lowest overall energy (19.8%) and exergy (20.2%) efficiencies. Moreover, the iron-chlorine cycle demonstrates the lowest unit cost of hydrogen (0.7 $/kg) followed by the copper-chlorine cycle (4 $/kg) with the magnesium-chlorine cycle exhibiting an extremely high unit hydrogen cost (8.9 $/kg). This study also identifies certain key factors that largely impact the cost of hydrogen and comprehensively discusses the influence and extent of each factor on the cost of hydrogen.

Thermodynamic and exergoeconomic analysis of a proton exchange membrane fuel cell/absorption chiller CCHP system based on biomass gasification

This work investigates an integrated system consisting of biomass gasification process, proton exchange membrane fuel cell (PEMFC) and absorption chiller. The proposed system is studied from the energetic and exergoeconomic point of view. In addition, parametric analysis and uncertainty analysis are carried out to investigate the effects of four key operational parameters and three uncertain parameters. System energy efficiency and exergy efficiency are obtained as 57.41% and 18.07%, respectively. 21.46% of the electricity production is consumed by auxiliary components of the PEMFC stack. Largest exergy destruction is in the gasifier and the stack, due to significant irreversibility of chemical/electrochemical reactions. Exergoeconomic results indicate that in the selective oxidation process, investment cost is much higher than the cost rate of exergy destruction. While gasifier, anode/cathode heat exchangers and humidifiers, condenser, solution heat exchangers and valves have poor exergetic performance. High current density, operation temperature and moisture content are unfavorable for exergy efficiency. Extension of operation life, lower interest rate and lower maintenance factor can guarantee a desired system exergoeconomic performance. This research provides pragmatic information about thermodynamic and exergoeconomic performance of this integrated system. Obtained results are important for system design and operational optimization on various PEMFC coupled polygeneration systems.

Dynamic exergy and economic assessment of the implementation of seasonal underground thermal energy storage in existing solar district heating

In this paper, an exergoeconomic approach is proposed to assess the impact of the integration of a Borehole Thermal Energy Storage (BTES) in the existing district heating of the city of Chateaubriant in France. To do so, a dynamic simulation is run over ten years of operation. The model includes a new approach for cost calculation of short-term thermal storage, which is extended to seasonal BTES. The analysis of the system operation at yearly and daily scales revealed several issues. Hence, without redesigning the existing installation, it was found that a non-comprehensive control strategy results in an increase of fossil fuel share by 1.2%. At the BTES scale, from an exergoeconomic point of view, the charging stage is found particularly sensitive to the dynamic. For example, charging the BTES at low temperature increases of the specific cost of the heat stored. Hence, it is shown that some exergoeconomic indicators, like the specific cost of stored heat, could be relevant for designing and operating heating systems with borehole thermal energy storage.

Exergoeconomic analysis and optimization of a high-efficient multi-generation system powered by Sabalan (Savalan) geothermal power plant including branched GAX cycle and electrolyzer unit

Employing suitable subsystems to reach high efficiency and low cost in renewable-based power plants is more crucial. The geothermal energy heat source is located in many countries, but this has never been investigated to run a multi-generation system, including a branched GAX cycle and an electrolyzer. In this path, a high-efficient multi-generation system powered by a Sabalan (Savalan) geothermal power plant consisting of a single flash cycle, a branched GAX cycle, and an electrolyzer is presented and scrutinized from thermodynamic and exergoeconomic viewpoints. In the end, a two-objective optimization, by using the Total Unit Cost of Product (TUCP) and energy efficiency as objectives, is utilized to find the optimum operating conditions. Critiques and studies of variables reveal that the produced hydrogen rate remains unchanged at 5.655 kg/h by changing the degassing value and temperature of the generator, condenser 2, and evaporator. By increasing the flash tank pressure from 5.2 bar to 7 bar, the cooling and heating loads rise about 108.4%, while the net electricity falls from 3977 kW to 3506 kW. Interestingly, the TUCP has a minimum value at the evaporator temperature of 273 K and condenser 2 temperature of 322.3 K. The optimization results indicate the values of the produced hydrogen rate and net electricity with 5.85 kg/h and 4187 kW are more than those of the base case. Also, the optimal values are 7.046 $/GJ, 36.82%, and 65.42% for the TUCP and energy and exergy efficiencies, respectively.

Optimization of a biomass-driven Rankine cycle integrated with multi-effect desalination, and solid oxide electrolyzer for power, hydrogen, and freshwater production

The current work is a study of electricity, hydrogen, and freshwater polygeneration system fueled by biomass fuel. Accordingly, innovative integration of a Rankine cycle, a multi-effect desalination, and a solid oxide electrolyzer cell has been considered utilizing a syngas production biomass combustion chamber. The waste heat and a part of the output electricity of the Rankine cycle have been employed to launch the desalination and electrolyzer units, respectively. The suggested polygeneration is analyzed from the thermodynamic and exergoeconomic viewpoints through developing a code in engineering equation solver software and a multi-criteria optimization via MATLAB software. Hence, the NSGA-II optimization method and decision-making TOPSIS technique have been implemented. The parametric study has been conducted based on the effect of biomass fuel mass flow rate, turbine inlet pressure, combustion chamber outlet temperature, and pinch point temperature difference of the steam generator on the thermodynamic and exergoeconomic variables of the whole system. Considering the total exergy destruction rate, exergy efficiency, and total unit exergy cost of products as objective functions, the suggested system achieved the optimum values of 17.64%, 7658.5 kW, and 26 $/GJ corresponding for these variables.

Comprehensive thermodynamic and exergoeconomic analyses and multi-objective optimization of a compressed air energy storage hybridized with a parabolic trough solar collectors

This paper designs a novel power plant consisting of a medium-temperature solar field based on parabolic trough solar collectors, an organic Rankine cycle, and a compressed air energy storage unit. The solar field supplies the energy required by the organic Rankine cycle at the charging period, providing the power for the compressors and high-temperature energy storage. Also, for the performance improvement of the system, zeotropic mixtures are employed as the working fluids in the Rankine cycle. The system was assessed from energy, exergy, and exergoeconomic viewpoints. A comprehensive parametric study was performed to examine the effects of some key parameters on the performance of the devised system. And, the MOPSO optimization algorithm is selected to optimize the calculations, wherein the TOPSIS decision-making method identifies the optimal solutions. According to the results, Isopentane/R142b mixture was selected as the efficient zeotropic working fluid of the Rankine cycle. Hence, the optimum energy efficiency and exergy efficiency were computed to be 5.08% and 5.04%, respectively. Besides, the optimum round trip efficiency and exergetic round trip efficiency were obtained by 57.06% and 66.20%, respectively. Moreover, considering electricity cost of 0.36 $.GJ−1, the lowest payback period of 4.39 years, and the highest profitability were obtained.

Exergy and exergoeconomic comparison between multiple novel combined systems based on proton exchange membrane fuel cells integrated with organic Rankine cycles, and hydrogen boil-off gas subsystem

A comparative study is applied to evaluate four combined power producing systems based on low-temperature and high-temperature proton exchange membrane fuel cells (LT-PEMFC and HT-PEMFC) with equal power generation of 1056 kW. Single-stage organic Rankine cycle (SORC) and cascade two-stage ORC (CTORC) are employed to recover the waste heat from the fuel cells as well as exploiting the hydrogen boil-off gas for generating excess power, and feeding to the fuel cells. The performance of the proposed systems is compared to energy, exergy, and exergoeconomic viewpoints. Also, a parametric analysis is carried out to assess the effects on the thermodynamic and economic performance of the investigated systems by considering main parameters such as current density, fuel cell operating pressure and temperature, turbine inlet pressure, and expander lead. The results obtained from the parametric analysis reveal that with increasing the fuel cell operating temperature the overall exergy efficiencies for the proposed combined systems based on LT-PEMFC and HT-PEMFC decreases and increases, respectively. Also, the net output power and the total product unit cost of the considered systems are optimized at a specific value of BOG expander inlet pressure. The results indicate that albeit the highest values of energy and exergy efficiencies among the considered systems (61.42% and 63.20%) are related to LT-PEMFC/CTORC but the lowest total product unit cost of 33.75 $/GJ is related to HT-PEMFC/SORC.

A Novel Electricity and Freshwater Production System: Performance Analysis from Reliability and Exergoeconomic Viewpoints with Multi-Objective Optimization

Based on the benefits of integrated gasification combined cycles (IGCCs), a cogeneration plant for providing electricity and freshwater is proposed. The main novelties of the devised system are the integration of biomass gasification and a regenerative gas turbine with intercooling and a syngas combustor, where the syngas produced in the gasifier is burned in the combustion chamber and fed to a gas turbine directly. The energy discharged from the gas turbine is utilized for further electricity and freshwater generation via Kalina and MED hybridization. The proposed system is analyzed from energy, exergy, exergoeconomic, and reliability–availability viewpoints. The optimal operating condition and optimum performance criteria are obtained by hybridizing an artificial neural network (ANN), the multi-objective particle swarm optimization (MOPSO) algorithm. According to results obtained, for the fourth scenario of the optimization process, optimal values of 45.10%, 14.27 kg·s−1, 12.95 USD·GJ−1, and 8141 kW are obtained for the exergy efficiency, freshwater production rate, sum unit cost of products, and net output power, respectively. According to reliability and availability assessment, the probability of the healthy working state of all components and subsystems is 88.4403%; the system is shown to be 87.74% available of the time over the 20-year lifetime.

Exergo-economic analysis and multi-objective multi-verse optimization of a solar/biomass-based trigeneration system using externally-fired gas turbine, organic Rankine cycle and absorption refrigeration cycle

• A solar/biomass-based trigeneration system has been proposed. • The system comprises an EFGT, an ORC, and a LiBr/H 2 O absorbtion refrigeration cycle. • The system is studied from the energy, exergy, and exergo-economic perspective. • Solar thermal improves the thermodynamic efficiency of the system by about 10%. • MOMVO outperforms MOPSO and NSGA-II in solving multi-objective optimization problem. In the present work, an innovative configuration is proposed based on solar pre-heating concept and biomass direct-combustion for combined production of electricity, hot water and cooling load. The studied system consists of an externally fired gas turbine, a trans-critical organic Rankine cycle, and a Li-Br/H 2 O absorption refrigeration cycle. The proposed system is thoroughly analyzed from the energy, exergy, and exergo-economic viewpoint. The results of the exergo-economic analysis demonstrate that the energy and exergy efficiencies of the reference case are 55.56% and 20.38% and the product cost rate is 26.4 $/h. Comparing the thermodynamic results to the literature, it is proved that the proposed system generates a considerably higher amount of power, heating, and cooling load which results in an improvement of energy efficiency by about 10%. In further, the main design parameters of each cycle are parametrically assessed to gain a comprehensive understanding of the system behavior. Finally, a new multi-objective optimization algorithm called multi-objective multi-verse optimizer (MOMVO) is employed to maximize exergy efficiency and minimize the product cost rate of the system. Compared to the base case, TOPSIS implementation revealed that the optimal final solution of the Pareto-frontier found by the MOMVO has about 9% higher second law efficiency while the product cost rate is decreased by around 6%. This result proved the better performance of the MOMVO compared to other conventional evolutionary-based multi-objective optimzation algorithms.

Energy, exergy, and exergoeconomic analysis of a polygeneration system driven by solar energy with a thermal energy storage tank for power, heating, and freshwater production

A trigeneration system based on parabolic trough solar collectors and thermal energy storage tank is devised for simultaneous power, heating, and freshwater production. The proposed system is analyzed from energy, exergy, and exergoeconomic viewpoints. Moreover, a parametric analysis was applied to evaluate the effects of some basic thermodynamic parameters cycle performance. Also, the optimum performance of the system in two optimization scenarios is found by applying the multi-objective genetic algorithm and using LINMAP decision-making method. The results revealed that the system could yield net output power, heating capacity, and freshwater rate of370.1kW,2423kW, and1.34kg/s, respectively. The energy and exergy efficiencies, coefficient of performance, and the total cost rate of the product are obtained as34.78%,13.42%,0.49, and176.73$/h. Also, it is revealed that the solar section is responsible for56% of the overall exergy destruction rate. The parametric study showed that increment of pinch point temperature of RORC evaporator results in lower energy and exergy efficiencies and higher total cost rate of products. Also, the final optimal solution selected by the LINMAP method is a maximum exergy efficiency of19.87% and the minimum cost rate of157.73$/h for the second optimization scenario.

Multi-objective optimization and exergoeconomic analysis of geothermal-based electricity and cooling system using zeotropic mixtures as the working fluid

An innovative combined cooling and power generation system is designed employing the flash-binary geothermal system. In the proposed plant, an internal combination of dual-pressure organic Rankine cycle and ejector refrigeration cycle is employed as the binary subsystem in the flash-binary plant. Another positive aspect of the proposed system is the profiting of zeotropic mixtures advantages in the binary unit. The feasibility of the proposed system is analyzed from the energy, exergy, and exergoeconomic viewpoints. Then, the robust Non-Dominated Sorting Genetic Algorithm II optimizer and linear programming technique for multi-dimensional analysis of preference decision-making technique are employed to optimize the proposed plant’s performance. The optimized values in the power-cost scenario are obtained for the mass fraction of 0.474 with the values of 1.745 MW, 232.92 kW, 18.23 %, 54.84 %, and 12.13 $.GJ−1 for the total output power, total cooling capacity, energy efficiency, exergy efficiency, and sum unit cost of products, respectively. Finally, a parametric analysis is performed to show the effect of the main influential parameters on the system’s performance. It is revealed that the increment of separator’s pressure results in lower output power, lower exergetic efficiency, higher cooling load, and higher thermal efficiency.

Exergoeconomic Evaluation and Optimization of Dual Pressure Organic Rankine Cycle (ORC) for Geothermal Heat Source Utilization

In the present study, a dual-pressure organic Rankine cycle (DORC) driven by geothermal hot water for electricity production is developed, investigated and optimized from the energy, exergy and exergoeconomic viewpoint. A parametric study is conducted to determine the effect of high-stage pressure and low-stage pressure variation on the system thermodynamic and exergoeconomic performance. The DORC is further optimized to obtain maximum exergy efficiency optimized design (EEOD case) and minimum product cost optimized design (PCOD case). The exergy efficiency and unit cost of power produced for the optimization of EEOD case and PCOD case are 33.03% and 3.059 cent/kWh, which are 0.3% and 17.4% improvement over base case, respectively. The PCOD case proved to be the best, with respect to minimum unit cost of power produced and net power output over the base case and EEOD case.