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The current study aims to validate and apply an instrument to assess the relationship between communication overload, social overload, technostress, exhaustion and academic performance. We performed a cross-sectional, analytical study of 2286 university medical students to assess the influence of technostress as a mediator of social media overload, communication overload and mental exhaustion and its detrimental effect on the academic performance of university students in Peru during the COVID-19 pandemic. The research model was validated using partial least square structural equation modeling (PLS-SEM) to establish the influence of variables on the model. Communication and social overload were found to positively influence technostress by correlations of 0.284 and 0.557, respectively. Technostress positively influenced exhaustion by 0.898, while exhaustion negatively influenced academic performance by -0.439. Bootstrapping demonstrated that the path coefficients of the research model were statistically significant. The research outcomes may help university managers understand students’ technostress and develop strategies to improve the balanced use of technology for their daily academic activities.
Aldo Alvarez-Risco; Shyla Del-Aguila-Arcentales; Jaime Yáñez; Marc Rosen; Christian Mejia. Influence of Technostress on Academic Performance of University Medicine Students in Peru during the COVID-19 Pandemic. Sustainability 2021, 13, 8949 .
AMA StyleAldo Alvarez-Risco, Shyla Del-Aguila-Arcentales, Jaime Yáñez, Marc Rosen, Christian Mejia. Influence of Technostress on Academic Performance of University Medicine Students in Peru during the COVID-19 Pandemic. Sustainability. 2021; 13 (16):8949.
Chicago/Turabian StyleAldo Alvarez-Risco; Shyla Del-Aguila-Arcentales; Jaime Yáñez; Marc Rosen; Christian Mejia. 2021. "Influence of Technostress on Academic Performance of University Medicine Students in Peru during the COVID-19 Pandemic." Sustainability 13, no. 16: 8949.
This research assesses the influence of education development support, conceptual development support, and country support through entrepreneurial self-efficacy over green entrepreneurial intentions. A total of 532 business students in Ecuador participated in an online survey. Eight questions were focused on demographic information, and twenty-seven questions evaluated the green entrepreneurship intentions of students. An SEM-PLS technical analysis was used. The results showed that educational support for developing entrepreneurship (0.296), conceptual support for developing entrepreneurship (0.123), and country support for entrepreneurship (0.188) had a positive influence on entrepreneurial self-efficacy, and that entrepreneurial self-efficacy had a positive influence (0.855) on gren entrepreneurial intentions. The model explained 73.1% of the green entrepreneurial intentions. Outcomes of the bootstrapping test were used to evaluate if the path coefficients are significant. This study showed the impacts of education development support, conceptual development support, and country support on the entrepreneur’s ability to carry out green entrepreneurship were positive. This information can help universities develop strategic plans to achieve ecological ventures and ensure students have the necessary skills to do so on campus. The research findings also may be helpful for the governments in establishing new norms to promote entrepreneurship. The novelty is based on using the partial least square structural equation modeling (PLS-SEM) technique.
Aldo Alvarez-Risco; Sabina Mlodzianowska; Verónica García-Ibarra; Marc Rosen; Shyla Del-Aguila-Arcentales. Factors Affecting Green Entrepreneurship Intentions in Business University Students in COVID-19 Pandemic Times: Case of Ecuador. Sustainability 2021, 13, 6447 .
AMA StyleAldo Alvarez-Risco, Sabina Mlodzianowska, Verónica García-Ibarra, Marc Rosen, Shyla Del-Aguila-Arcentales. Factors Affecting Green Entrepreneurship Intentions in Business University Students in COVID-19 Pandemic Times: Case of Ecuador. Sustainability. 2021; 13 (11):6447.
Chicago/Turabian StyleAldo Alvarez-Risco; Sabina Mlodzianowska; Verónica García-Ibarra; Marc Rosen; Shyla Del-Aguila-Arcentales. 2021. "Factors Affecting Green Entrepreneurship Intentions in Business University Students in COVID-19 Pandemic Times: Case of Ecuador." Sustainability 13, no. 11: 6447.
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
Farzad Hamrang; S. Mahmoudi; Marc Rosen. A Novel Electricity and Freshwater Production System: Performance Analysis from Reliability and Exergoeconomic Viewpoints with Multi-Objective Optimization. Sustainability 2021, 13, 6448 .
AMA StyleFarzad Hamrang, S. Mahmoudi, Marc Rosen. A Novel Electricity and Freshwater Production System: Performance Analysis from Reliability and Exergoeconomic Viewpoints with Multi-Objective Optimization. Sustainability. 2021; 13 (11):6448.
Chicago/Turabian StyleFarzad Hamrang; S. Mahmoudi; Marc Rosen. 2021. "A Novel Electricity and Freshwater Production System: Performance Analysis from Reliability and Exergoeconomic Viewpoints with Multi-Objective Optimization." Sustainability 13, no. 11: 6448.
Energy sustainability is a key consideration for anthropogenic activity and the development of societies, and more broadly, civilization. In this article, energy sustainability is described and examined, as are methods and technologies that can help enhance it. As a key component of sustainability, the significance and importance of energy sustainability becomes clear. Requirements to enhance energy sustainability are described, including low environmental and ecological impacts, sustainable energy resources and complementary energy carriers, high efficiencies, and various other factors. The latter are predominantly non-technical, and include living standards, societal acceptability and equity. The outcomes and results are anticipated to inform and educate about energy sustainability, to provide an impetus to greater energy sustainability.
Marc A. Rosen. Energy Sustainability with a Focus on Environmental Perspectives. Earth Systems and Environment 2021, 1 -14.
AMA StyleMarc A. Rosen. Energy Sustainability with a Focus on Environmental Perspectives. Earth Systems and Environment. 2021; ():1-14.
Chicago/Turabian StyleMarc A. Rosen. 2021. "Energy Sustainability with a Focus on Environmental Perspectives." Earth Systems and Environment , no. : 1-14.
No one can disagree the growing attention to developing and utilizing high temperature fuel cells partly due to their potential for multi-service applications. Recently, much focus can be observed on examination of the integration of solid oxide fuel cell (SOFC) or molten carbonate fuel cell (MCFC) systems with other subsystems to propose polygeneration plants. Literature review prove that, to propose a polygeneration concept based on SOFC and MCFC systems, there is not a typical way commonly used by researchers. So it is tried to categorize and survey the current challenges of the high temperature fuel cell polygeneration plants. In this regard, the most common concepts and some unique system designs are reviewed and investigated in terms of fuel type, plant scale, electrical efficiency, overall efficiency and other performance indicators. It is figured out that similar to the typical CCHP system, the most common polygeneration designs are those utilizing the potential of exhaust gases from the natural gas fed fuel cell system in a heat recovery unit and a refrigeration system. A notable observed trend in recent years is the coupling of biofuels with polygeneration concepts. We found that there are still great challenges regarding how to predict the fuel cell actual cell voltage influencing the overall efficiency of polygeneration plants. It is also observed that attendance of researchers to analyze the polygeneration systems from the viewpoints of economic and environmental is less in comparison with the investigation of the systems from the thermodynamics point of view.
A.S. Mehr; A. Lanzini; M. Santarelli; Marc A. Rosen. Polygeneration systems based on high temperature fuel cell (MCFC and SOFC) technology: System design, fuel types, modeling and analysis approaches. Energy 2021, 228, 120613 .
AMA StyleA.S. Mehr, A. Lanzini, M. Santarelli, Marc A. Rosen. Polygeneration systems based on high temperature fuel cell (MCFC and SOFC) technology: System design, fuel types, modeling and analysis approaches. Energy. 2021; 228 ():120613.
Chicago/Turabian StyleA.S. Mehr; A. Lanzini; M. Santarelli; Marc A. Rosen. 2021. "Polygeneration systems based on high temperature fuel cell (MCFC and SOFC) technology: System design, fuel types, modeling and analysis approaches." Energy 228, no. : 120613.
Below a certain depth, the ground temperature remains almost unchanged annually. This phenomenon can be exploited by coupling a ground heat exchanger to a heat pump, storing heat in the ground during summer for use in winter. The ground provides a better source/sink for heat than outside air for heat pump efficiency, as it is cooler than the outside air in the summer and warmer in the winter. Through increased efficiency, such systems also help avoid environmental impact. Much attention is now focused on utilizing ground heat pumps for heating and cooling buildings, as well as water heating, refrigeration and other thermal tasks. Modeling such systems is important for understanding, designing and optimizing their performance and characteristics. Several heat transfer models exist for ground heat exchangers, which usually consist of a series of vertical or horizontal underground pipes. Here, an introduction to ground heat exchanger types is provided, analytical and numerical models for heat transfer in vertical heat exchangers are reviewed and compared, recent related developments are described, and design software for vertical ground heat exchangers is discussed.
Seama Koohi-Fayegh; Marc A. Rosen. Modeling of vertical ground heat exchangers. International Journal of Green Energy 2021, 18, 755 -774.
AMA StyleSeama Koohi-Fayegh, Marc A. Rosen. Modeling of vertical ground heat exchangers. International Journal of Green Energy. 2021; 18 (7):755-774.
Chicago/Turabian StyleSeama Koohi-Fayegh; Marc A. Rosen. 2021. "Modeling of vertical ground heat exchangers." International Journal of Green Energy 18, no. 7: 755-774.
The coronavirus disease 2019 (COVID-19) pandemic has changed the world, creating the need for new actions from society, including universities and companies. The United Nations Sustainable Development Goals (SDGs) are part of a global agenda, but this priority is not significant to university students. Although some research has focused on SDGs and university students, there is a lack of evaluation and comparison in Latin American countries. The current study aims to evaluate student knowledge of the SDGs, the relation of student professional careers to the SDGs, the importance of the SDGs for economic development after the COVID-19 pandemic, and student interest research in SDG issues. The study is carried out with students in Colombia, Ecuador, Mexico, and Peru. The instrument was developed and validated. The highest score of level of knowledge was reported in Mexico and the lowest score in Colombia. This outcome can be explained by the availability of training programs in the universities about SDGs. The availability of programs created and promoted by the governments can also be a reason; however, students from Mexico are the ones who felt the most that the authorities are not making efforts to promote the SDGs. With research interests, interests in creating sustainable cities and communities, and responsible consumption and production were recognized for the four countries. The outcomes reveal several interesting insights through comparisons among the four countries considered according to descriptive analyses. Some SDGs were found to be more important for some countries than others. Interests were noted in research on some SDGs.
Aldo Alvarez-Risco; Shyla Del-Aguila-Arcentales; Marc Rosen; Verónica García-Ibarra; Sandra Maycotte-Felkel; Gabriel Martínez-Toro. Expectations and Interests of University Students in COVID-19 Times about Sustainable Development Goals: Evidence from Colombia, Ecuador, Mexico, and Peru. Sustainability 2021, 13, 3306 .
AMA StyleAldo Alvarez-Risco, Shyla Del-Aguila-Arcentales, Marc Rosen, Verónica García-Ibarra, Sandra Maycotte-Felkel, Gabriel Martínez-Toro. Expectations and Interests of University Students in COVID-19 Times about Sustainable Development Goals: Evidence from Colombia, Ecuador, Mexico, and Peru. Sustainability. 2021; 13 (6):3306.
Chicago/Turabian StyleAldo Alvarez-Risco; Shyla Del-Aguila-Arcentales; Marc Rosen; Verónica García-Ibarra; Sandra Maycotte-Felkel; Gabriel Martínez-Toro. 2021. "Expectations and Interests of University Students in COVID-19 Times about Sustainable Development Goals: Evidence from Colombia, Ecuador, Mexico, and Peru." Sustainability 13, no. 6: 3306.
In reversible solid oxide cell (rSOC)-based renewable microgrids connected to the network, control logic optimizing the power split with the grid is needed. The benefits associated with such configuration are assessed and compared to an islanded reversible microgrid, previously designed via a model-based approach. Multiple loads are met, including those of a residential complex as well as electric and fuel cell vehicle fleets. The energy storage system consists of a rSOC and hydrogen and thermal storage tanks. The targeted optimal power split annual trajectory is found through dynamic programming. Suitable simplifying assumptions are introduced to develop a fast reduced-order sub-model from the original islanded rSOC microgrid, thus conceiving the optimal control problem as a one state dynamic programming task. Due to the connection to the grid, the energy storage system no longer has to compensate for the difference between generation and demand, thus enabling economic rSOC sub-scaling. Finding the best control strategy and resizing jointly lead to capital and operating expense reductions. The optimization outcomes indicate how a 60% reduction in rSOC nominal power allows for a simple payback period of 40% less than for the islanded design, as well as for proper rSOC capacity exploitation.
F. Vitale; N. Rispoli; M. Sorrentino; M.A. Rosen; C. Pianese. On the use of dynamic programming for optimal energy management of grid-connected reversible solid oxide cell-based renewable microgrids. Energy 2021, 225, 120304 .
AMA StyleF. Vitale, N. Rispoli, M. Sorrentino, M.A. Rosen, C. Pianese. On the use of dynamic programming for optimal energy management of grid-connected reversible solid oxide cell-based renewable microgrids. Energy. 2021; 225 ():120304.
Chicago/Turabian StyleF. Vitale; N. Rispoli; M. Sorrentino; M.A. Rosen; C. Pianese. 2021. "On the use of dynamic programming for optimal energy management of grid-connected reversible solid oxide cell-based renewable microgrids." Energy 225, no. : 120304.
An 80‐kW solid‐oxide fuel cell (SOFC)‐based power plant coupled with methane tri‐reforming is proposed and analyzed from the viewpoint of thermoeconomics. In order to integrate the SOFC power generation section with the external reformer, part of the exhaust gases from the afterburner is recycled and utilized as a reformer agent in the reactor. The main challenge in performing the economic analysis is the determination of the costs associated with the tri‐reforming process, in particular the reactor cost. To accomplish this, a mathematical procedure is suggested and applied for a fixed‐bed reactor based on both the chemical equilibrium and chemical kinetics describing the tri‐reforming process. The effects on system performance of important design parameters, including current density, SOFC operating temperature, and exhaust gas recirculation (EGR) percentage, are investigated. The results indicate that system performance is enhanced by using lower values of current density and higher values of SOFC operating temperature. In addition, considering the thermal and environmental performance of system as criteria, the use of EGR is not recommended. However, as the EGR percentage increases, the product unit cost decreases, making EGR advantageous from an economic perspective.
Mohsen Sadeghi; Moharram Jafari; S. M. S. Mahmoudi; Mortaza Yari; Marc A. Rosen. Thermoeconomic analysis and multi‐objective optimization of a solid‐oxide fuel cell plant coupled with methane tri‐reforming: Effects of thermochemical recuperation. International Journal of Energy Research 2021, 45, 10332 -10354.
AMA StyleMohsen Sadeghi, Moharram Jafari, S. M. S. Mahmoudi, Mortaza Yari, Marc A. Rosen. Thermoeconomic analysis and multi‐objective optimization of a solid‐oxide fuel cell plant coupled with methane tri‐reforming: Effects of thermochemical recuperation. International Journal of Energy Research. 2021; 45 (7):10332-10354.
Chicago/Turabian StyleMohsen Sadeghi; Moharram Jafari; S. M. S. Mahmoudi; Mortaza Yari; Marc A. Rosen. 2021. "Thermoeconomic analysis and multi‐objective optimization of a solid‐oxide fuel cell plant coupled with methane tri‐reforming: Effects of thermochemical recuperation." International Journal of Energy Research 45, no. 7: 10332-10354.
Space heating and cooling account for major portions of the energy consumption in various types of buildings. Energy use that relies heavily on fossil fuels results in greenhouse gas emissions and ultimately contributes to climate change via global warming. As such, it is important to utilize clean and renewable technologies to meet building energy demands. One such technology is the ground-source heat pump (GSHP), which uses the free and abundant energy from the ground. However, GSHP systems are expensive to install and often suffer from declining efficiencies over time, especially when they are employed in buildings that have unbalanced heating and cooling loads, such as those in extreme Canadian climates. In this study, we introduce a novel concept, a thermal caisson (TC), which not only considerably reduces the capital costs of GSHP systems, but also mitigates their efficiency degradation over time. TCs serve a dual functionality as both structural components that support the building as well as energy system components that provide heating and cooling to buildings. The TC comprises ground heat exchanger loops and a carefully chosen phase change material (PCM), which stores and releases large quantities of latent heat when needed, connected to a high efficiency heat pump inside the building. Results show that TCs could reduce the capital costs of GSHP systems by up to 49% and increase their coefficients of performance by up to 16% (with a median change from 3.7 to 4.3 in January) resulting in much shorter payback periods as well as more stable and improved performance. Compared to fossil-fuel based systems, TCs offer a considerable reduction (close to 30% in this study) in annual operating costs for a much smaller corresponding increase in capital costs. The results suggest that TCs have promise to be widely incorporated in the heating, ventilation, and air-conditioning systems of numerous building types.
Masih Alavy; Michael Peiris; Julie Wang; Marc A. Rosen. Assessment of a novel phase change material-based thermal caisson for geothermal heating and cooling. Energy Conversion and Management 2021, 234, 113928 .
AMA StyleMasih Alavy, Michael Peiris, Julie Wang, Marc A. Rosen. Assessment of a novel phase change material-based thermal caisson for geothermal heating and cooling. Energy Conversion and Management. 2021; 234 ():113928.
Chicago/Turabian StyleMasih Alavy; Michael Peiris; Julie Wang; Marc A. Rosen. 2021. "Assessment of a novel phase change material-based thermal caisson for geothermal heating and cooling." Energy Conversion and Management 234, no. : 113928.
The use of solar energy to preheat natural gas before a city gate station (CGS) for reducing fuel consumption and environmental emissions is investigated in a real CGS. All analyses are conducted with a 1-h time-step throughout the entire year so that seasonal climate changes are accounted for precisely. A thermodynamic analysis of the hybrid system is performed with TRNSYS and verified with THERMOFLEX so as to ensure reliability. In addition, dynamic exergetic, exergoeconomic, and exergoenvironmental analyses for the proposed system are carried out. A life cycle assessment (LCA) based on Eco-indicator 99 is performed using SIMA PRO to compute the environmental impacts for each component of the system. The exergetic, exergoeconomic, and environmental analyses are performed in Engineering Equation Solver (EES) software. To perform the transient exergetic, exergoeconomic, and environmental analyses, the results of the thermodynamic analysis from TRNSYS are automatically imported into the EES code. The advanced exergetic, exergoeconomic, and exergoenvironmental analyses are performed to better determine components that have high potentials for improving the system; potentials are considered based on the exergy destruction, exergetic cost of destruction, and environmental impacts associated with exergy destruction.
Mohammad Hasan Khoshgoftar Manesh; Mohammad Abdolmaleki; Hossein Vazini Modabber; Marc A. Rosen. Dynamic Advanced Exergetic, Exergoeconomic, and Environmental Analyses of a Hybrid Solar City Gate Station. Journal of Energy Resources Technology 2021, 143, 1 -19.
AMA StyleMohammad Hasan Khoshgoftar Manesh, Mohammad Abdolmaleki, Hossein Vazini Modabber, Marc A. Rosen. Dynamic Advanced Exergetic, Exergoeconomic, and Environmental Analyses of a Hybrid Solar City Gate Station. Journal of Energy Resources Technology. 2021; 143 (10):1-19.
Chicago/Turabian StyleMohammad Hasan Khoshgoftar Manesh; Mohammad Abdolmaleki; Hossein Vazini Modabber; Marc A. Rosen. 2021. "Dynamic Advanced Exergetic, Exergoeconomic, and Environmental Analyses of a Hybrid Solar City Gate Station." Journal of Energy Resources Technology 143, no. 10: 1-19.
Exergy is described as a tool for addressing climate change, in particular through identifying and explaining the benefits of sustainable energy, so the benefits can be appreciated by experts and non-experts alike and attained. Exergy can be used to understand climate change measures and to assess and improve energy systems. Exergy also can help better understand the benefits of utilizing sustainable energy by providing more useful and meaningful information than energy provides. Exergy clearly identifies efficiency improvements and reductions in wastes and environmental impacts attributable to sustainable energy. Exergy can also identify better than energy the environmental benefits and economics of energy technologies. Exergy should be applied by engineers and scientists, as well as decision and policy makers, involved in addressing climate change.
Marc A. Rosen. Exergy Analysis as a Tool for Addressing Climate Change. European Journal of Sustainable Development Research 2021, 5, em0148 .
AMA StyleMarc A. Rosen. Exergy Analysis as a Tool for Addressing Climate Change. European Journal of Sustainable Development Research. 2021; 5 (2):em0148.
Chicago/Turabian StyleMarc A. Rosen. 2021. "Exergy Analysis as a Tool for Addressing Climate Change." European Journal of Sustainable Development Research 5, no. 2: em0148.
Nuclear energy is often viewed as linked exclusively to electrical power generation. However, the applications for nuclear energy are significantly greater than only electricity, and include cogeneration, district heating and cooling, high-temperature process heating, hydrogen and alternative fuel production, transportation and desalination. These additional applications expand the prospects for nuclear energy notably, and enhance the benefits that can be derived from it, such as reduced environmental impact and climate change mitigation. Interest in non-electric applications of nuclear energy is growing for environmental, economic, security and other reasons. In this paper, non-electric applications of nuclear energy are reviewed, including technological, environmental and economic issues of such applications as well as future prospects and benefits of non-electric applications of nuclear energy.
Marc A. Rosen. Nuclear Energy: Non-Electric Applications. European Journal of Sustainable Development Research 2020, 5, em0147 .
AMA StyleMarc A. Rosen. Nuclear Energy: Non-Electric Applications. European Journal of Sustainable Development Research. 2020; 5 (1):em0147.
Chicago/Turabian StyleMarc A. Rosen. 2020. "Nuclear Energy: Non-Electric Applications." European Journal of Sustainable Development Research 5, no. 1: em0147.
Biomass gasification using a range of feedstocks is simulated in such mediums as air, O2, O2-enriched air, steam, CO2, and a mixture of these agents. A parametric study is performed to investigate the effects of the main parameters on the performance criteria of the gasifier. Accordingly, gasification temperature and pressure, and moisture content of biomass are considered as the decision variables. Subsequently, a tri-objective grey wolf optimization as a robust and advanced technique is applied to the gasification system to determine the most suitable feedstock for high cold gas and exergy efficiencies and low CO2 emissions. Maximization of the cold gas and exergy efficiencies and minimizing CO2 emissions are the main purposes of tri-objective grey wolf optimization. Pareto optimal solutions are presented for each gasification agent considering a wide range of feedstocks. The final optimum solution points are defined for a wide range of feedstocks and gasification agents by employing the LINMAP and TOPSIS methods. The results show that for biomass gasification where O2 is the gasification agent, a feedstock with the chemical formula of CH1.2O0.495 is preferred as in this condition the exergy and cold gas efficiencies are within the range of 79.1–80.7% and 84.0–87.5%, respectively. The results further show that CH1.5O0.71 and CH1.2O0.5 are suitable feedstocks for biomass gasification using steam and CO2, respectively. For the final optimum solution, the exergy efficiency of biomass gasification using a suitable feedstock in the medium of steam and CO2 is 93.7% and 94.7%, respectively. The corresponding values of cold gas efficiency are 94.8% and 75.8% for steam and CO2 agents, respectively.
Ali Habibollahzade; Pouria Ahmadi; Marc A. Rosen. Biomass gasification using various gasification agents: Optimum feedstock selection, detailed numerical analyses and tri-objective grey wolf optimization. Journal of Cleaner Production 2020, 284, 124718 .
AMA StyleAli Habibollahzade, Pouria Ahmadi, Marc A. Rosen. Biomass gasification using various gasification agents: Optimum feedstock selection, detailed numerical analyses and tri-objective grey wolf optimization. Journal of Cleaner Production. 2020; 284 ():124718.
Chicago/Turabian StyleAli Habibollahzade; Pouria Ahmadi; Marc A. Rosen. 2020. "Biomass gasification using various gasification agents: Optimum feedstock selection, detailed numerical analyses and tri-objective grey wolf optimization." Journal of Cleaner Production 284, no. : 124718.
In this paper a multigeneration system is proposed, which utilizes geothermal energy and a lithium-bromide absorption cooling cycle. The proposed system is capable of providing electricity, heating, cooling, and domestic hot water to a small residential community in Vancouver, British Columbia, Canada. The performance of the system's heating and cooling capabilities were evaluated energetically and exergetically. A case study is presented by considering human occupancy loads and the impact of building material conditions on heating and cooling. System performance was investigated using parametric studies, where the operating conditions and ambient conditions were varied. Similar systems in the open literature were found to have an energetic and exergetic coefficient of performance of 0.8 and 0.3 for heating, while the proposed multigeneration system resulted in an energetic and exergetic coefficient of performance of 1.14 and 0.63 for heating, an increase of 30-52%. Additionally, the literature revealed that some systems resulted in an energy and exergy efficiency of 26.2% and 36.6%. The proposed multigeneration system achieved an energy and exergy efficiency of 31.86% and 63.33%, an improvement of 5.66-26.73%. The study was able to utilize the existing recommendations made by British Columbia to determine the necessary heating and cooling loads while also being able to successfully generate 4 useful outputs with a smaller footprint than those in the literature.
Andre A. Bolt; Branson Chea; Ibrahim Dincer; Martin Agelin-Chaab; Marc A. Rosen. Design of a Multigenerational System with Absorption Cooling for a Residential Community: A Case Study. Journal of Energy Resources Technology 2020, 143, 1 -29.
AMA StyleAndre A. Bolt, Branson Chea, Ibrahim Dincer, Martin Agelin-Chaab, Marc A. Rosen. Design of a Multigenerational System with Absorption Cooling for a Residential Community: A Case Study. Journal of Energy Resources Technology. 2020; 143 (6):1-29.
Chicago/Turabian StyleAndre A. Bolt; Branson Chea; Ibrahim Dincer; Martin Agelin-Chaab; Marc A. Rosen. 2020. "Design of a Multigenerational System with Absorption Cooling for a Residential Community: A Case Study." Journal of Energy Resources Technology 143, no. 6: 1-29.
Due to the harmful effects and depletion of non-renewable energy resources, the major concerns are focused on using renewable energy resources. Among them, the geothermal energy has a high potential in volcano regions such as the Middle East. The optimization of an organic Rankine cycle with a geothermal heat source is investigated based on a genetic algorithm having two stages. In the first stage, the optimal variables are the depth of the well and the extraction flow rate of the geothermal fluid mass. The optimal value of the depth of the well, extraction mass flow rate, and the geothermal fluid temperature is found to be 2100 m, 15 kg/s, and 150 °C. In the second stage, the efficiency and output power of the power plant are optimized. To achieve maximum output power as well as cycle efficiency, the optimization variable is the maximum organic fluid pressure in the high-temperature heat exchanger. The optimum values of energy efficiency and cycle power production are equal to 0.433 MW and 14.1%, respectively.
Mehdi A. Ehyaei; Abolfazl Ahmadi; Marc A. Rosen; Afshin Davarpanah. Thermodynamic Optimization of a Geothermal Power Plant with a Genetic Algorithm in Two Stages. Processes 2020, 8, 1277 .
AMA StyleMehdi A. Ehyaei, Abolfazl Ahmadi, Marc A. Rosen, Afshin Davarpanah. Thermodynamic Optimization of a Geothermal Power Plant with a Genetic Algorithm in Two Stages. Processes. 2020; 8 (10):1277.
Chicago/Turabian StyleMehdi A. Ehyaei; Abolfazl Ahmadi; Marc A. Rosen; Afshin Davarpanah. 2020. "Thermodynamic Optimization of a Geothermal Power Plant with a Genetic Algorithm in Two Stages." Processes 8, no. 10: 1277.
Enhancing sustainability, performance, and saving costs, are important goals for the district heating and cooling industry. There are many options for the upgrading and alteration of the equipment which demand a large initial investment. Usually, the initial cost is a barrier to implementing the plan. In this study, sustainability, performance, and cost savings are improved without any equipment change. Exergy assessment along with TRNSYS modeling and simulation are the tools applied in this study. The focus is on the operation time of the equipment. By adjusting the operation time of the equipment with the highest exergy destruction, in the district cooling in the University of Idaho, Moscow campus in the United States of America (USA) all three goals without any equipment change has been achieved. The operation hours of cold thermal energy storage (TES), cooling towers, and chillers are altered by removing the low efficiency operation time. As results electricity consumption is reduced to 38%, which is beneficial in terms of sustainability, as it eliminates 428,800 kg CO2 emissions in electricity generation and provides an annual cost saving of $140,000. Ultimately, modification of the equipment operation in district cooling is a key to improvement of sustainability and cost saving.
Austin Anderson; Behnaz Rezaie; Marc A. Rosen. An innovative approach to enhance sustainability of a district cooling system by adjusting cold thermal storage and chiller operation. Energy 2020, 214, 118949 .
AMA StyleAustin Anderson, Behnaz Rezaie, Marc A. Rosen. An innovative approach to enhance sustainability of a district cooling system by adjusting cold thermal storage and chiller operation. Energy. 2020; 214 ():118949.
Chicago/Turabian StyleAustin Anderson; Behnaz Rezaie; Marc A. Rosen. 2020. "An innovative approach to enhance sustainability of a district cooling system by adjusting cold thermal storage and chiller operation." Energy 214, no. : 118949.
Integrated biomass gasification combined cycles can be advantageous for providing multiple products simultaneously. A new electricity and freshwater generation system is proposed based on the integrated gasification and gas turbine cycle as the main system, and a steam Rankine cycle and multi-effect desalination system as the waste heat recovery units. To evaluate the performance of the system, energy, exergy, and economic analyses were performed. Also, a parametric analysis was performed to assess the effects of various parameters on the system’s performance criteria. The economic feasibility of the plant was analyzed in terms of net present value. For the base case, the performance metrics are evaluated as Wnet=8.347 MW, ε=46.22%, SUCP=14.07 $/GJ, and mfw=11.7 kg/s. Among all components of the system, the combustion chamber is the greatest contributor to the exergy destruction rate, at 3250 kW. It is shown with the parametric analysis that raising the combustion temperature leads to higher electricity and freshwater production capacity. For a fuel cost of 2 $/GJ and an electricity price of 0.07 $/kWh, the total net present value at the end of plant’s lifespan is 6.547×106 $, and the payback period is 6.75 years. Thus, the plant is feasible from an economic perspective.
Farzad Hamrang; Afshar Shokri; S. M. Seyed Mahmoudi; Biuk Ehghaghi; Marc A. Rosen. Performance Analysis of a New Electricity and Freshwater Production System Based on an Integrated Gasification Combined Cycle and Multi-Effect Desalination. Sustainability 2020, 12, 7996 .
AMA StyleFarzad Hamrang, Afshar Shokri, S. M. Seyed Mahmoudi, Biuk Ehghaghi, Marc A. Rosen. Performance Analysis of a New Electricity and Freshwater Production System Based on an Integrated Gasification Combined Cycle and Multi-Effect Desalination. Sustainability. 2020; 12 (19):7996.
Chicago/Turabian StyleFarzad Hamrang; Afshar Shokri; S. M. Seyed Mahmoudi; Biuk Ehghaghi; Marc A. Rosen. 2020. "Performance Analysis of a New Electricity and Freshwater Production System Based on an Integrated Gasification Combined Cycle and Multi-Effect Desalination." Sustainability 12, no. 19: 7996.
Sustainable energy is one of the main options for resolving energy problems and climate change issues. Solar energy is one of the main promising renewable energy sources, which can be captured and converted to electrical energy through photovoltaic (PV) panels. In the open literature, it is shown that having two PV panels integrated into a back‐to‐back configuration placed on naturally reflective surfaces provides the potential of doubling the total power produced by a single‐faced PV panel with the appropriate location and orientation. This paper presents a case study of two‐PV panel systems for offshore power production. The relevance to offshore has the water surface as the reflective surface to produce power from the back facing panel. The city of Ottawa in Canada is selected as the location for a case study. Various conditions and operating parameters are considered in assessing the performance of the proposed system, including solar radiation intensity, system orientation, time of year in terms of months, and the variations in parameters throughout the day. The assessment of the proposed system is carried out through modeling and simulating the proposed double PV panels in the COMSOL Multiphysics software. It is found that the minimum improvement in the total power production over the single face conventional PV is 38% in January for the east‐facing PV front face. For the two PV systems, the optimal overall power production for the various time conditions and orientations, at the specified location, is found to be the north orientation of the PV panel. In this case, the power it produces is 89% of that of the east orientation. A similar trend is observed for the single‐faced PV panel, where the north‐facing PV provides 62% of what it could produce in the east‐facing orientation.
Maan Al‐Zareer; Ibrahim Dincer; Marc A. Rosen. Performance improvement study of an integrated photovoltaic system for offshore power production. International Journal of Energy Research 2020, 45, 772 -785.
AMA StyleMaan Al‐Zareer, Ibrahim Dincer, Marc A. Rosen. Performance improvement study of an integrated photovoltaic system for offshore power production. International Journal of Energy Research. 2020; 45 (1):772-785.
Chicago/Turabian StyleMaan Al‐Zareer; Ibrahim Dincer; Marc A. Rosen. 2020. "Performance improvement study of an integrated photovoltaic system for offshore power production." International Journal of Energy Research 45, no. 1: 772-785.
The psychometric properties of the Sustainable Development Goals Psychological Inventory (SDGPI) are verified, by employing quantitative and qualitative approaches, in order to obtain a thorough comprehension of the self-perceptions of the sustainable development goals by the Italian participants in this research. The reliability, dimensionality, and aspects of concurrent validity were tested for the SDGPI. Three unidimensional factors (interest, motivation, and self-efficacy) were shown to be prevalent using exploratory factor analysis. Furthermore, the SDGPI showed adequate concurrent validity and internal consistency in the present study. To broaden the quantitative findings, responses to open-ended questions were analyzed. The results suggest perspectives for future exploration and actions regarding the psychology of sustainable development and sustainability.
Annamaria Di Fabio; Marc Rosen. An Exploratory Study of a New Psychological Instrument for Evaluating Sustainability: The Sustainable Development Goals Psychological Inventory. Sustainability 2020, 12, 7617 .
AMA StyleAnnamaria Di Fabio, Marc Rosen. An Exploratory Study of a New Psychological Instrument for Evaluating Sustainability: The Sustainable Development Goals Psychological Inventory. Sustainability. 2020; 12 (18):7617.
Chicago/Turabian StyleAnnamaria Di Fabio; Marc Rosen. 2020. "An Exploratory Study of a New Psychological Instrument for Evaluating Sustainability: The Sustainable Development Goals Psychological Inventory." Sustainability 12, no. 18: 7617.