In this study, the thermoeconomic performance of absorption refrigeration cycle utilizing binary solution containing water-ionic liquid (1-Ethyl-3-Methylimidazolium Trifluoroacetate) is investigated and compared with the water-lithium bromide cycle. For this purpose, the thermodynamic and thermoeconomic analysis have been employed to simulation of the cycle and then, the effects of design parameters on the performance parameters like coefficient of performance, exergetic efficiency, solution circulation flow ratio, area of heat exchangers and cost of the streams are studied. The thermodynamic properties of the binary solution are predicted using Non-Random Two Liquids model. It has been found the system with ionic liquid has a lower coefficient of performance and exergetic efficiency (0. 66, 10. 15%) than aqueous solution of lithium bromide system (0. 78, 12 %). The total area and total cost of the ionic liquid system (49 m2, 4907 $/year) is larger than water-lithium bromide cycle (16 m2, 3347 $/year). Despite the Lower performance of systems with ionic liquid, the advantages of these liquids like no crystallization, negligible vapor pressure and weak corrosion tendency to iron-steel materials make the new working pair suited for the absorption refrigeration cycle.

In this research, thermoeconomic analysis of a multi-effect desalination thermal vapor compression (MED-TVC) system integrated with a trigeneration system with a gas turbine prime mover is carried out. The integrated system comprises of a compressor, a combustion chamber, a gas turbine, a triple-pressure (low, medium and high pressures) heat recovery steam generator  (HRSG) system, an absorption chiller cycle (ACC), and a multi-effect desalination (MED) system. Low pressure steamproduced in the HRSG is used to drive absorption chiller cycle, medium pressure is used in desalination system and high pressure superheated steam is used for heating purposes. For thermodynamic and thermoeconomic analysis of the proposed integrated system, Engineering Equation Solver is used by employing mass, energy, exergy, and cost balance equations for each component of system. The results of the modeling showed that with the new design, the exergy efficiency in the base design will increase to 57.57%. In addition, thermoeconomic analysis revealed that the net power, heating, fresh water and cooling have the highest production cost, respectively..

In this paper, a system of simultaneous production of power and heat and cooling in a Kalina cycle has been analyzed by energy, exergy and economic aspects. To provide heat in the cycle heating unit, four types of solar thermal linear (PTC) and linear share (LFR) heat collectors, plate (dish) and vacuum tube, have been used. The results of the analysis of this cycle for the PTC collector compared to other collectors showed that this collector was superior in increasing the energy and exergy efficiencies of the system and also lowering the total cost rate and exergy destruction of the CCHP cycle. By using parametric studies tried to obtain the effect of increasing and decreasing some of the cycle component parameters to get the most cooling, heating and power output.

Recently, discussions about energy and global warming have significantly increased the focus on renewable energy. One of the suitable options for this purpose is the use of multigeneration systems with solar and geothermal energy sources. In this research, a multigeneration system for hydrogen, cooling, heating and power production based on the organic Rankine cycle, absorption chiller cycle dryer, and the proton exchange membrane (PEM) electrolyzer is investigated from thermodynamic and thermoeconomic points of view. In the organic Rankine cycles (ORC), a thermoelectric generator (TEG) unit is applied instead of a condenser, and different working fluids are tested to study their performance on the system. All the simulations are carried out using the Engineering Equation Solver (EES) software. The impact of different factors on the efficiency of the multigeneration system is investigated. The system's energetic efficiency is measured at 41.58%, while its exergetic efficiency stands at 25.61%, according to the findings. Moreover, by using the TEG unit, 466.4 kW extra power is obtained. Furthermore, the system can generate 493.1 kg/day hydrogen. From an exergy destruction perspective, the solar collector and the PEM electrolyzer exhibit the highest amounts. Finally, it is demonstrated that the geothermal temperature and turbine inlet temperature positively impact the system’s performance, while collector inlet temperature leads to a decrease in performance.

In the current study a combined heat and power (CHP) system based on diesel engines is studied. After modeling the different components of a CHP system, the system is investigated parametrically according to first and second laws of thermodynamics. In this investigation instead of modeling the air standard cycle, the fuel air standard cycle and fuel combustion are simulated, which leads to more accurate results. However, a standard cycle has many differences with an actual cycle, and therefore the results of its analysis will be, to some extent, different from the results of analyzing the corresponding actual cycle. Therefore, the exhaust gas from combustion chamber of a diesel engine is also used to simulate the CHP system, and the heat exchanger of the CHP is investigated from exergetic and economic viewpoints. It was seen that, applying the pre-described system, it is possible to warm up 0.17kg/s water from 25°C to 68.64oC. This enhances the overall efficiency of the system about 20%, raising it up to 80%. Exergy destruction in heat exchanger is slightly high which is due to heat transfer process and high temperature difference in the heat exchanger.

The purpose of this research is to investigate thermoeconomic optimization and exergy analysis of transcritical CO2 refrigeration cycle with an ejector. After modeling thermodynamic equations of elements and considering optimization parameters of emerging temperature of gas of cooler (Tgc) (Tgc), emerging pressure of cooler's gas (Pgc) (Pgc), and evaporative temperature (Tevp) (Tevp), optimization of target function is done. Target function indicates total expenses of the system during a year which is consisted of expenses of entering exergy and spending on the system's equipment. Optimized amplitude of decision variables are gained by the balance between the entering exergy and yearly initial capital investing. Results indicate reduction in yearly total expenses of system (34%) and enhancement in thermodynamic functionality coefficient and exergetic efficiency in optimum point toward end point.

This study deals with the design and analysis of a polygeneration system for the utilization of flare gas to produce power, freshwater, hydrogen, and heat simultaneously. The proposed system, using local resources such as flare gas and Persian Gulf water in the Ahvaz region, consists of a supercritical carbon dioxide power cycle, a thermoelectric generator, crude oil preheating, a reverse osmosis desalination unit, and hydrogen production in a proton exchange membrane electrolyzer. The system modeling was carried out using Engineering Equation Solver software and evaluated based on energy, exergy, and exergoeconomic analyses. The novelty of this research lies in presenting an integrated system that, by using flare gas for the simultaneous production of multiple products, maximizes energy recovery and meets both industrial and domestic needs. The base design results show that the energy and exergy efficiencies of the system are 83.24% and 23.56%, respectively, with a net output power of 12.23 MW and a thermal load capacity of 13.39 MW. Hydrogen production amounts to 60.93 kg/day, and freshwater production equals 106.7 kg/s. Moreover, the total rates of exergy production cost, exergy destruction, and investment are calculated to be 2982.96, 347.58, and 645.84 $/h, respectively, with a payback period of 1.172 years. Finally, a sensitivity analysis was performed to investigate the effect of key variables on the system performance.

Fuel efficiency of helicopter and aircraft propulsion systems become more important in recent years due to the rising fuel costs and environmental impacts of aviation emissions. In this regard, in the present study, the use of three conventional types of jet fuels in a turboshaft engine is investigated from exergy and exergoeconomic viewpoints. Component-based exergy and cost calculations are accomplished by developing thermodynamic and exergoeconomic models which their accuracy is validated using the available experimental data in the literature. To examine the effects of important design/operating variables on the engine performance, a parametric study is performed for the considered fuels to assess exergy and economic performance. Also, the influence of flight altitude is investigated on the engine performance in terms of net output power, exergy efficiency, and unit cost of power. The results indicate that, JP-4 jet fuel yields better performance for considered turboshaft engine in terms of exergy efficiency and unit cost of power. It is shown that the engine exergy efficiency for JP-4 fuel is around 9 % and 6% higher than that for JP-5 and JP-8 fuels, respectively. 

In this paper, the superconducting carbon dioxide cycle is re-examined and compared from the perspective of advanced and thermoconomic exergy analysis to identify real potentials and prioritize the improvement of cycle components. In advanced exergy analysis, in addition to calculating the total exogenous exergy destruction for each component, the contribution and effect of each of the other components and their combination in causing this inefficiency have also been identified. In thermoeconomic analysis of the system, the unit cost of the product, the cost of investment and the cost of destroying the exergy for the components of the system are calculated. Improvements based on advanced exergy analysis are assigned to high temperature recuperator, turbine, compressor 1, preheater, low temperature recuperator, compressor 2 and reactor, respectively. Also, based on thermoeconomic analysis, improving the turbine and reactor is not economically justified. However, the results show that even by abandoning the improvement of these two components, due to their high economic cost and by improving other components of the cycle based on the prioritization of advanced exergy analysis, it is possible to increase the efficiency of the exergy cycle from 4/29/47. There is 63% to 47.4% and cycle energy efficiency from 34.15% to 45.84%.