Dynamic Advanced Exergetic, Exergoeconomic, and Environmental Analyses of a Hybrid Solar City Gate Station

Manesh, Mohammad Hasan Khoshgoftar; Abdolmaleki, Mojtaba; Modabber, Hossein Vazini; Rosen, Marc A.

doi:10.1115/1.4049459

Cited by 10 publications

(2 citation statements)

References 23 publications

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“…In the current study, natural gas was considered as fuel; CO, CO 2 , and NO x were considered to be pollutants. The combustion chamber process was considered as the type of process; accordingly, the corresponding emission factors, which were determined based on [39,40], were calculated as follows:…”

Section: Environmental Analysismentioning

confidence: 99%

4E Transient Analysis of a Solar-Hybrid Gas-Turbine Cycle Equipped with Heliostat and MED

Ghasemiasl,

Dehghanizadeh,

Javadi

et al. 2023

Sustainability

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The current study investigates a cogeneration cycle of power and freshwater integrated with a solar system. The solar system is of the heliostat type, which is considered to preheat the inlet air in the combustion chamber of a 25-MW gas turbine. The waste heat of the turbine output stream is used to produce freshwater. Parameters such as the ambient temperature and solar irradiance significantly affect the system’s performance; hence, all analyses, including those pertaining to energy, exergy, economics, and environment, were conducted transiently, with a one-hour time step throughout the year so that the impacts of these effective parameters could be examined. Besides the analysis assuming a constant mass flow rate for the air entering the compressor, the calculations were repeated with the assumption of a constant volumetric flow rate to evaluate the cycle in the same conditions as those of natural gas power plants. Given the constant volumetric flow rate, for every 10-degree increase in temperature, the compressor power consumption decreased by approximately 2%. Moreover, a sensitivity analysis of the cycle performance in terms of ambient temperature was performed, and the corresponding results are presented. Finally, some correlations are presented to estimate variations in compressor power consumption and net turbine power due to temperature variations. The results demonstrate that in Bushehr, Iran, every one-degree increase in ambient temperature leads to an approximately 0.67 percentage decrease in net-generated power. In the end, the performance of the cycle was investigated under climatic conditions and solar irradiation intensities in several cities in Iran and some cities in different countries in which heliostat power plants have already been established. The results obtained in these cities were compared; it was concluded that the lowest annual cost of electricity generation is related to Isfahan in Iran, which reduces the cost of electricity generation by more than 20% (2.32 Cents/kWh) compared to the base cycle.

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Section: Environmental Analysismentioning

confidence: 99%

4E Transient Analysis of a Solar-Hybrid Gas-Turbine Cycle Equipped with Heliostat and MED

Ghasemiasl,

Dehghanizadeh,

Javadi

et al. 2023

Sustainability

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“…Advanced analysis of a geothermal driven KC gave the improvement priority to the condenser, while the evaporator has higher exergy destruction than the turbine in conventional exergy analysis [24]. Khoshgoftar et al conducted advanced exergy analysis of a power plant/multi-effect distillation/desalination integrated system [25], a solar hybrid city gate station [26], and a combined freshwaterpower generation system [27]. More detailed results and pragmatic conclusions were obtained in their research.…”

Section: Introductionmentioning

confidence: 99%

Advanced Exergy Analysis of an Absorption Chiller/Kalina Cycle Integrated System for Low-Grade Waste Heat Recovery

Liu

Zeng

Deng³

et al. 2022

Processes

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Exergy analysis and advanced exergy analysis of an absorption chiller/Kalina cycle integrated system are conducted in this research. The exergy destruction of each component and overall exergy efficiency of the cascade process have been obtained. Advanced exergy analysis investigates the interactions among different components and the actual improvement potential. Results show that among all the equipment, the largest exergy destruction is in the generators and absorber. System exergy efficiency is obtained as 35.52%. Advanced analysis results show that the endogenous exergy destruction is dominant in each component. Interconnections among different components are not significant but very complicated. It is suggested that the improvement priority should be given to the turbine. Performance improvement of this low-grade waste heat recovery process is still necessary because around 1/4 of the total exergy destruction can be avoided. Exergy and advanced exergy analysis in this work locates the position of exergy destruction, quantifies the process irreversibility, presents the component interactions and finds out the system improvement potential. This research provides detailed and useful information about this absorption chiller/Kalina cycle integrated system.

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Exergy consumption and entropy generation rates of earth: an assessment for the planet and its primary systems

Rosen

2021

Energ. Ecol. Environ.

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Although energy is conventionally examined when studying thermodynamic flows and balances for the Earth and its systems, the planet does not consume energy as its energy inflows and outflows are in balance. Similarly, energy is conserved for systems on the Earth. The Earth does, however, consume exergy and generate entropy, and it is insightful to examine the thermodynamics of the Earth in terms of exergy, or the related quantity entropy. These perspectives are considered here for the Earth and its main systems: the biosphere, people and civilization. The work provides an enhanced understanding of the type, location and causes of thermodynamic losses for the Earth as well as its main systems and subsystems, and of the connections and relations between the Earth and its biosphere, as well as civilization and people. It is observed for the year 2019 that civilization uses exergy to create many products and services and that the exergy consumption rate of the Earth's biosphere is approximately five times larger than that of civilization and 100 times larger than that of people as individuals. Also, the solar exergy rate provides the Earth with a very large exergy input rate, about 10,000 times greater than the needs.

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Dynamic Advanced Exergetic, Exergoeconomic, and Environmental Analyses of a Hybrid Solar City Gate Station

Cited by 10 publications

References 23 publications

4E Transient Analysis of a Solar-Hybrid Gas-Turbine Cycle Equipped with Heliostat and MED

4E Transient Analysis of a Solar-Hybrid Gas-Turbine Cycle Equipped with Heliostat and MED

Advanced Exergy Analysis of an Absorption Chiller/Kalina Cycle Integrated System for Low-Grade Waste Heat Recovery

Exergy consumption and entropy generation rates of earth: an assessment for the planet and its primary systems

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