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Hadis Hemmati; Jian Zhang; Emily Spayde; Pedro Mago; Heejin Cho. Performance Analysis of a Solar Powered Organic Rankine Cycle With Energy Storage in Different Climate Zones in the United States. 2021, 1 .
AMA StyleHadis Hemmati, Jian Zhang, Emily Spayde, Pedro Mago, Heejin Cho. Performance Analysis of a Solar Powered Organic Rankine Cycle With Energy Storage in Different Climate Zones in the United States. . 2021; ():1.
Chicago/Turabian StyleHadis Hemmati; Jian Zhang; Emily Spayde; Pedro Mago; Heejin Cho. 2021. "Performance Analysis of a Solar Powered Organic Rankine Cycle With Energy Storage in Different Climate Zones in the United States." , no. : 1.
Solar-powered organic Rankine cycle (ORC) is considered a promising technology and has the potential to provide clean electric energy. Extensive studies on the design of ORC systems have been conducted and reported in the literature. However, few studies have presented the influence of climate zones on the performance of a solar-powered ORC, especially for an integrated ORC and energy storage system. This paper presents an analysis to determine the performance of solar-powered ORCs with electric energy storage (EES) systems to supply electricity to buildings in different climate zones in the United States. The building type evaluated in this paper is a large office, and the energy consumption of the facility in each climate location was determined using EnergyPlus. The ORC-EES operational strategy used in this investigation is described as follows: when solar irradiation is adequate to produce power, the ORC charges the EES. Then, when there is no solar energy available, the EES provides power to the building. The ORC-EES is evaluated based on the potential to reduce the operational cost, the primary energy consumption, and the carbon dioxide emission. Furthermore, the influence of the number of solar collectors and the EES size on the performance of the ORC-EES system is investigated.
Hadis Hemmati; Jian Zhang; Emily Spayde; Pedro J. Mago; Heejin Cho. Performance Analysis of Solar-Powered Organic Rankine Cycle With Energy Storage in Different Climate Zones in the United States. Journal of Energy Resources Technology 2021, 143, 1 -24.
AMA StyleHadis Hemmati, Jian Zhang, Emily Spayde, Pedro J. Mago, Heejin Cho. Performance Analysis of Solar-Powered Organic Rankine Cycle With Energy Storage in Different Climate Zones in the United States. Journal of Energy Resources Technology. 2021; 143 (9):1-24.
Chicago/Turabian StyleHadis Hemmati; Jian Zhang; Emily Spayde; Pedro J. Mago; Heejin Cho. 2021. "Performance Analysis of Solar-Powered Organic Rankine Cycle With Energy Storage in Different Climate Zones in the United States." Journal of Energy Resources Technology 143, no. 9: 1-24.
This paper presents an analysis to foresee renewable design requirement changes of net- zero carbon buildings (NZCBs) under different scenarios of potential future climate scenarios in the U.S. Northeast and Midwest regions. A climate change model is developed in this study using the Gaussian random distribution method with monthly temperature changes over the whole Northeast and Midwest regions, which are predicted based on a high greenhouse gas (GHG) emission scenario (i.e., the representative concentration pathways (RCP) 8.5). To reflect the adoption of NZCBs potential in future, this study also considers two representative future climate scenarios in the 2050s and 2080s of climate change years in the U.S. Northeast and Midwest regions. An office prototype building model integrates with an on-site photovoltaics (PV) power generation system to evaluate NZCB performance under the climate change scenarios with an assumption of a net-metering electricity purchase agreement. Appropriate capacities of the on-site PV system needed to reach NZCB balances are determined based on the building energy consumption impacted by the simulated climate scenarios. Results from this study demonstrated the emission by electricity consumption increases as moving toward the future scenarios of up to about 25 tons of CO2-eq (i.e., about 14% of the total CO2-eq produced by the electricity energy source) and the PV installation capacity to offset the emission account for the electricity consumption increases significantly up to about 40 kWp (i.e., up to more than 10% of total PV installation capacities) as the different climate scenarios are applied. It is concluded that the cooling energy consumption of office building models would significantly impact GHG emission as future climate scenarios are considered. Consequently, designers of NZCBs should consider high performance cooling energy systems in their designs to reduce the renewable energy generation system capacity to achieve net-zero carbon emission goals.
Dongsu Kim; Heejin Cho; Pedro J. Mago; Jongho Yoon; HyoMun Lee. Impact on Renewable Design Requirements of Net-Zero Carbon Buildings under Potential Future Climate Scenarios. Climate 2021, 9, 17 .
AMA StyleDongsu Kim, Heejin Cho, Pedro J. Mago, Jongho Yoon, HyoMun Lee. Impact on Renewable Design Requirements of Net-Zero Carbon Buildings under Potential Future Climate Scenarios. Climate. 2021; 9 (1):17.
Chicago/Turabian StyleDongsu Kim; Heejin Cho; Pedro J. Mago; Jongho Yoon; HyoMun Lee. 2021. "Impact on Renewable Design Requirements of Net-Zero Carbon Buildings under Potential Future Climate Scenarios." Climate 9, no. 1: 17.
Advancements in computer and mobile technologies have driven transformations of classroom activities in engineering education. This evolution provides instructors more opportunities to introduce computational tools that can be effectively used and promoted in engineering education to advance students’ learning process when the tools are appropriately utilized in the classroom activities. This paper presents a methodology to improve student learning of energy systems through a class assignment implementing a self-developed computational tool using Microsoft Excel and utilizing the tool to enhance their learning experience. The proposed method, a student-centered learning approach, was applied in a technical elective course called “Power Generation Systems” within a mechanical engineering curriculum. In the course, students were guided to develop a computational tool by themselves based on their learning of the fundamental principles and governing equations of a thermodynamics cycle. The self-developed computational tool allows the students to focus on more design-oriented problems, instead of the calculation process. Using the self-developed tool, students can have an enhanced understanding of the energy system performance in varying design and operational conditions and can perform the parametric analysis and visualization of essential parameters. Feedback from the students and class instructors proves that the self-development and use of the tool can significantly improve the students’ learning experience in the implemented course, make the course more dynamic, and motivate the students to learn the material more iteratively. In addition, students feel confident using computational tools to perform analysis, and are willing to develop more tools for other energy-related engineering applications.
Jian Zhang; Heejin Cho; Pedro Mago. Improving Student Learning of Energy Systems through Computational Tool Development Process in Engineering Courses. Sustainability 2021, 13, 884 .
AMA StyleJian Zhang, Heejin Cho, Pedro Mago. Improving Student Learning of Energy Systems through Computational Tool Development Process in Engineering Courses. Sustainability. 2021; 13 (2):884.
Chicago/Turabian StyleJian Zhang; Heejin Cho; Pedro Mago. 2021. "Improving Student Learning of Energy Systems through Computational Tool Development Process in Engineering Courses." Sustainability 13, no. 2: 884.
This study simulates an increased thermal capacitance (ITC) and thermal storage management (TSM) system to reduce the energy consumed by air conditioning and heating systems. The ITC/TSM is coupled with phase change materials (PCM), which enable tank volume reduction. The transient energy modeling software, the Transient System Simulation Tool (TRNSYS), is used to simulate the buildings’ thermal response and energy consumption, as well as the ITC/TSM system and controls. Four temperature-controlled operating regimes are used for the tank: building shell circulation, heat exchanger circulation, solar panel circulation, and storage. This study also explores possible energy-saving benefits from tank volume reduction such as losses associated with the environment temperature due to tank location. Three different tank locations are considered in this paper: outdoor, buried, and indoor. The smallest tank size (five gallons) is used for indoor placement, while the large tank (50 gallons) is used either for outdoor placement or buried at a depth of 1 m. Results for Atlanta, Georgia show an average 48% required energy decrease for cold months (October–April) and a 3% decrease for warm months (May–September) for the ITC/TSM system with PCM when compared with the reference case. A system with PCM reduces the tank size by 90% while maintaining similar energy savings.
Mary Wilson; Rogelio Luck; Pedro J. Mago; Heejin Cho. Building Energy Management Using Increased Thermal Capacitance and Thermal Storage Management. Buildings 2018, 8, 86 .
AMA StyleMary Wilson, Rogelio Luck, Pedro J. Mago, Heejin Cho. Building Energy Management Using Increased Thermal Capacitance and Thermal Storage Management. Buildings. 2018; 8 (7):86.
Chicago/Turabian StyleMary Wilson; Rogelio Luck; Pedro J. Mago; Heejin Cho. 2018. "Building Energy Management Using Increased Thermal Capacitance and Thermal Storage Management." Buildings 8, no. 7: 86.
This paper presents an analysis to determine the economic, energetic, and environmental benefits that could be obtained from the implementation of a combined solar-power organic Rankine cycle (ORC) with electric energy storage (EES) to supply electricity to several commercial buildings including a large office, a small office, and a full service restaurant. The operational strategy for the ORC-EES system consists in the ORC charging the EES when the irradiation level is sufficient to generate power, and the EES providing electricity to the building when there is not irradiation (i.e., during night time). Electricity is purchased from the utility grid unless it is provided by the EES. The potential of the proposed system to reduce primary energy consumption (PEC), carbon dioxide emission (CDE), and cost was evaluated. Furthermore, the available capital cost for a variable payback period for the ORC-EES system was determined for each of the evaluated buildings. The effect of the number of solar collectors on the performance of the ORC-EES is also studied. Results indicate that the proposed ORC-EES system is able to satisfy 11%, 13%, and 18% of the electrical demand for the large office, the small office and the restaurant, respectively.
Emily Spayde; Pedro J. Mago; Rogelio Luck. Economic, Energetic, and Environmental Performance of a Solar Powered Organic Rankine Cycle with Electric Energy Storage in Different Commercial Buildings. Energies 2018, 11, 276 .
AMA StyleEmily Spayde, Pedro J. Mago, Rogelio Luck. Economic, Energetic, and Environmental Performance of a Solar Powered Organic Rankine Cycle with Electric Energy Storage in Different Commercial Buildings. Energies. 2018; 11 (2):276.
Chicago/Turabian StyleEmily Spayde; Pedro J. Mago; Rogelio Luck. 2018. "Economic, Energetic, and Environmental Performance of a Solar Powered Organic Rankine Cycle with Electric Energy Storage in Different Commercial Buildings." Energies 11, no. 2: 276.
Harrison Warren; Pedro J. Mago; Alta Knizley; Rogelio Luck. Performance enhancement of a power generation unit–organic Rankine cycle system through the addition of electric energy storage. Journal of Energy Storage 2017, 10, 28 -38.
AMA StyleHarrison Warren, Pedro J. Mago, Alta Knizley, Rogelio Luck. Performance enhancement of a power generation unit–organic Rankine cycle system through the addition of electric energy storage. Journal of Energy Storage. 2017; 10 ():28-38.
Chicago/Turabian StyleHarrison Warren; Pedro J. Mago; Alta Knizley; Rogelio Luck. 2017. "Performance enhancement of a power generation unit–organic Rankine cycle system through the addition of electric energy storage." Journal of Energy Storage 10, no. : 28-38.
Heejin Cho; Aaron Smith; Rogelio Luck; Pedro J. Mago. Transient Uncertainty Analysis in Solar Thermal System Modeling. Journal of Uncertainty Analysis and Applications 2017, 5, 1 .
AMA StyleHeejin Cho, Aaron Smith, Rogelio Luck, Pedro J. Mago. Transient Uncertainty Analysis in Solar Thermal System Modeling. Journal of Uncertainty Analysis and Applications. 2017; 5 (1):1.
Chicago/Turabian StyleHeejin Cho; Aaron Smith; Rogelio Luck; Pedro J. Mago. 2017. "Transient Uncertainty Analysis in Solar Thermal System Modeling." Journal of Uncertainty Analysis and Applications 5, no. 1: 1.
A model to evaluate the performance of a solar powered regenerative Organic Rankine Cycle (R-ORC) using five dry organic fluids: RC318, R227ea, R236ea, R236fa, and R218, is presented in this paper. The system is evaluated in two locations in the U.S.: Jackson, MS and Tucson, AZ. The weather data for each location is used to determine the heat available from the solar collector that could be used by the R-ORC to generate power. Results from the R-ORC performance are compared with a basic ORC using first and second law criteria as well as primary energy consumption (PEC) and carbon dioxide emission (CDE) savings for both locations. An economic analysis to determine the maximum capital cost for a desired payback period is presented in this paper. A parametric analysis is also performed to study the effect of the turbine efficiency as well as the open feed organic fluid heater intermediate pressure on the system performance. Results indicate that the R-ORC is able to generate more power than the basic ORC for some of the selected working fluids. For the R-ORC, R236ea is the working fluid that show the best performance among the evaluated fluids under the modeled conditions. On the other hand, the basic ORC with R236ea as the working fluid outperformed three of the fluids in the R-ORC. Also, the R-ORC evaluated in Tucson, AZ is able to generate more power, to provide more PEC and CDE savings, and had a higher available capital cost than the R-ORC evaluated in in Jackson, MS.
Emily Spayde; Pedro J. Mago; Heejin Cho. Performance Evaluation of a Solar-Powered Regenerative Organic Rankine Cycle in Different Climate Conditions. Energies 2017, 10, 94 .
AMA StyleEmily Spayde, Pedro J. Mago, Heejin Cho. Performance Evaluation of a Solar-Powered Regenerative Organic Rankine Cycle in Different Climate Conditions. Energies. 2017; 10 (1):94.
Chicago/Turabian StyleEmily Spayde; Pedro J. Mago; Heejin Cho. 2017. "Performance Evaluation of a Solar-Powered Regenerative Organic Rankine Cycle in Different Climate Conditions." Energies 10, no. 1: 94.
This paper evaluates the influence of several parameters on the potential of using increased thermal capacitance (ITC) as a passive energy management technique to decrease a building’s cooling load. ITC is implemented by circulating water from a storage tank through a piping system located in the building’s ceiling. The cooling load of the ITC enhanced building is compared to the cooling load of a reference building without ITC. TRNSYS, a transient system simulation software, is used to simulate both the ITC enhanced building and the reference building. The following parameters that affect the performance of the ITC are analyzed: tank size, specific heat, mass flow rate, initial temperature of the working fluid, pipe material and wall thickness, and location of the piping system in the ceiling. These parameters are also modified to achieve the best results for each of the climate conditions investigated. The simulations demonstrate that ITC has the potential to reduce the overall cooling load in a range between 4% to 8%, depending on the location and the month of the year.
Joseph Carpenter; Pedro J. Mago; Rogelio Luck; Heejin Cho. Parametric Analysis of a Passive Energy Management Through Increased Thermal Capacitance. The Open Mechanical Engineering Journal 2016, 10, 38 -50.
AMA StyleJoseph Carpenter, Pedro J. Mago, Rogelio Luck, Heejin Cho. Parametric Analysis of a Passive Energy Management Through Increased Thermal Capacitance. The Open Mechanical Engineering Journal. 2016; 10 (1):38-50.
Chicago/Turabian StyleJoseph Carpenter; Pedro J. Mago; Rogelio Luck; Heejin Cho. 2016. "Parametric Analysis of a Passive Energy Management Through Increased Thermal Capacitance." The Open Mechanical Engineering Journal 10, no. 1: 38-50.
Joseph Carpenter; Pedro J. Mago; Rogelio Luck; Heejin Cho. Parametric Analysis of a Passive Energy Management Through Increased Thermal Capacitance. The Open Mechanical Engineering Journal 2016, 10, 38 -50.
AMA StyleJoseph Carpenter, Pedro J. Mago, Rogelio Luck, Heejin Cho. Parametric Analysis of a Passive Energy Management Through Increased Thermal Capacitance. The Open Mechanical Engineering Journal. 2016; 10 (1):38-50.
Chicago/Turabian StyleJoseph Carpenter; Pedro J. Mago; Rogelio Luck; Heejin Cho. 2016. "Parametric Analysis of a Passive Energy Management Through Increased Thermal Capacitance." The Open Mechanical Engineering Journal 10, no. 1: 38-50.
This paper explores the use of a computational tool developed in Microsoft Excel to enhance the students’ understanding of the different psychrometric processes of moist air in courses such as Thermodynamics and Air Conditioning. The proposed computational tool allows students to focus on more design-oriented problems. Furthermore, students will have the ability to see immediate results to variations of the design conditions as well as different parameters that would affect the different psychrometric processes. The proposed tool also gives students a quick visualization of the evaluated psychrometric process in the psychrometric chart as well as the ability to quickly determine psychrometric properties of moist air. Feedback from students and class instructors proves that the use of the proposed tool significantly enhances the student learning experience in these two courses, make the course more dynamic, and motivate the students to learn the material.
Pedro J. Mago; William Long. Implementation of a computational tool to study psychrometric processes in mechanical engineering courses. International Journal of Mechanical Engineering Education 2016, 44, 29 -55.
AMA StylePedro J. Mago, William Long. Implementation of a computational tool to study psychrometric processes in mechanical engineering courses. International Journal of Mechanical Engineering Education. 2016; 44 (1):29-55.
Chicago/Turabian StylePedro J. Mago; William Long. 2016. "Implementation of a computational tool to study psychrometric processes in mechanical engineering courses." International Journal of Mechanical Engineering Education 44, no. 1: 29-55.
Alta Knizley; Pedro J. Mago; James Tobermann; Harrison R. Warren. Performance characterization of a power generation unit–organic Rankine cycle system based on the efficiencies of the system components. Energy Conversion and Management 2015, 105, 480 -487.
AMA StyleAlta Knizley, Pedro J. Mago, James Tobermann, Harrison R. Warren. Performance characterization of a power generation unit–organic Rankine cycle system based on the efficiencies of the system components. Energy Conversion and Management. 2015; 105 ():480-487.
Chicago/Turabian StyleAlta Knizley; Pedro J. Mago; James Tobermann; Harrison R. Warren. 2015. "Performance characterization of a power generation unit–organic Rankine cycle system based on the efficiencies of the system components." Energy Conversion and Management 105, no. : 480-487.
This study uses a first-order approximation of a micro-building to investigate the major factors determining how increased thermal capacitance (ITC) with thermal storage management (TSM) can reduce energy consumption in locations with relatively mild weather conditions such as the southeastern part of the United States of America. In this study, ITC is achieved through water circulation between a large storage tank and pipes embedded within the building envelope. Although ITC results in a larger dominant time constant for the thermal response of a building, an adaptive allocation and control of the added capacitance through TSM significantly improves the benefits of the extra capacitance. This paper compares two first-order models for a micro-building: a reference case model with a single lumped thermal capacitance associated with the building, and another model, with the building’s capacitance plus the capacitance of the water system. Results showed that the ITC/TSM system reduced the cost of conditioning the building by reducing the operating time of both the cooling and the heating systems. May through September, the air conditioning operating time was reduced by an average of 70%, and October through April, the operation of the heating system was reduced by an average of 25%.
Mary B. Wilson; Rogelio Luck; Pedro J. Mago. A First-Order Study of Reduced Energy Consumption via Increased Thermal Capacitance with Thermal Storage Management in a Micro-Building. Energies 2015, 8, 12266 -12282.
AMA StyleMary B. Wilson, Rogelio Luck, Pedro J. Mago. A First-Order Study of Reduced Energy Consumption via Increased Thermal Capacitance with Thermal Storage Management in a Micro-Building. Energies. 2015; 8 (10):12266-12282.
Chicago/Turabian StyleMary B. Wilson; Rogelio Luck; Pedro J. Mago. 2015. "A First-Order Study of Reduced Energy Consumption via Increased Thermal Capacitance with Thermal Storage Management in a Micro-Building." Energies 8, no. 10: 12266-12282.
This paper focuses on the analysis of a combined heat and power (CHP) system utilizing two power generation units operating simultaneously under differing operational strategies (D-CHP) on the basis of operational cost savings. A cost optimization metric, based on the facility monthly power-to-heat ratio (PHR), is presented in this paper. The PHR is defined as the ratio between the facility electric load and thermal load. Previous work in this field has suggested that D-CHP system performance may be improved by limiting operation of the system to months in which the PHR is relatively low. The focus of this paper is to illustrate how the facility PHR parameter could be used to establish the potential of a D-CHP system to reduce operational cost with respect to traditional CHP systems and conventional systems with separate heating and power. This paper analyzes the relationship between the PHR and the operational cost savings of eight different benchmark buildings. Achieving operational cost savings through optimal operation based on monthly PHR for these building types can enhance the implementation potential of D-CHP and CHP systems. Results indicate that the PHR parameter can be used to predict the potential for a D-CHP system to reduce the operational cost
Alta Knizley; Pedro J. Mago; James Tobermann. Evaluation of the operational cost savings potential from a D-CHP system based on a monthly power-to-heat ratio analysis. Cogent Engineering 2015, 2, 1 .
AMA StyleAlta Knizley, Pedro J. Mago, James Tobermann. Evaluation of the operational cost savings potential from a D-CHP system based on a monthly power-to-heat ratio analysis. Cogent Engineering. 2015; 2 (1):1.
Chicago/Turabian StyleAlta Knizley; Pedro J. Mago; James Tobermann. 2015. "Evaluation of the operational cost savings potential from a D-CHP system based on a monthly power-to-heat ratio analysis." Cogent Engineering 2, no. 1: 1.
The use of computational tools such as Mathcad or Microsoft Excel to enhance the students' understanding of the physics behind psychrometric processes in buildings in an air conditioning technical elective course is explored in this paper. By utilizing Mathcad and/or Excel, students can be taught to create a set of psychrometric-related functions that can greatly diminish the number of calculations required to tackle design-oriented problems. By doing this, two levels of conceptual understanding are enhanced. First, students gain an appreciation of the basic psychrometric processes for buildings when creating specific functions in Mathcad/Excel, and second, students gain the ability to create automated worksheets for specific applications, allowing them to see immediate results to variations in input design conditions, as well as on different parameters. Feedback from students, as well as class instructors, demonstrates that the use of these tools enhance the student experience in an air conditioning class and make the course more dynamic and engaging.
Pedro J. Mago; Rogelio Luck. Use of Computational Tools to Enhance the Study of Psychrometric Processes for Buildings in an Air Conditioning Course. International Journal of Mechanical Engineering Education 2014, 42, 251 -266.
AMA StylePedro J. Mago, Rogelio Luck. Use of Computational Tools to Enhance the Study of Psychrometric Processes for Buildings in an Air Conditioning Course. International Journal of Mechanical Engineering Education. 2014; 42 (3):251-266.
Chicago/Turabian StylePedro J. Mago; Rogelio Luck. 2014. "Use of Computational Tools to Enhance the Study of Psychrometric Processes for Buildings in an Air Conditioning Course." International Journal of Mechanical Engineering Education 42, no. 3: 251-266.
Joseph Carpenter; Pedro J. Mago; Rogelio Luck; Heejin Cho. Passive energy management through increased thermal capacitance. Energy and Buildings 2014, 75, 465 -471.
AMA StyleJoseph Carpenter, Pedro J. Mago, Rogelio Luck, Heejin Cho. Passive energy management through increased thermal capacitance. Energy and Buildings. 2014; 75 ():465-471.
Chicago/Turabian StyleJoseph Carpenter; Pedro J. Mago; Rogelio Luck; Heejin Cho. 2014. "Passive energy management through increased thermal capacitance." Energy and Buildings 75, no. : 465-471.
Alta Knizley; Pedro J. Mago; Amanda D. Smith. Evaluation of the performance of combined cooling, heating, and power systems with dual power generation units. Energy Policy 2014, 66, 654 -665.
AMA StyleAlta Knizley, Pedro J. Mago, Amanda D. Smith. Evaluation of the performance of combined cooling, heating, and power systems with dual power generation units. Energy Policy. 2014; 66 ():654-665.
Chicago/Turabian StyleAlta Knizley; Pedro J. Mago; Amanda D. Smith. 2014. "Evaluation of the performance of combined cooling, heating, and power systems with dual power generation units." Energy Policy 66, no. : 654-665.
This paper presents a methodology to estimate the economic, emissions, and energy benefits that could be obtained from a base loaded CHP system using screening parameters and system component efficiencies. On the basis of the location of the system and the facility power to heat ratio, the power that must be supplied by a base loaded CHP system in order to potentially achieve cost, emissions, or primary energy savings can be estimated. A base loaded CHP system is analyzed in nine US cities in different climate zones, which differ in both the local electricity generation fuel mix and local electricity prices. Its potential to produce economic, emissions, and energy savings is quantified on the basis of the minimum fraction of the useful heat to the heat recovered by the CHP system (φmin). The values for φmin are determined for each location in terms of cost, emissions, and energy. Results indicate that in terms of cost, four of the nine evaluated cities (Houston, San Francisco, Boulder, and Duluth) do not need to use any of the heat recovered by the CHP system to potentially generate cost savings. On the other hand, in cities such as Seattle, around 86% of the recovered heat needs to be used to potentially provide cost savings. In terms of emissions, only Chicago, Boulder, and Duluth are able to reduce emissions without using any of the recovered heat. In terms of primary energy consumption, only Chicago and Duluth do not require the use of any of the recovered heat to yield primary energy savings. For the rest of the evaluated cities, some of the recovered heat must be used in order to reduce the primary energy consumption with respect to the reference case. In addition, the effect of the efficiency of the power generation unit and the facility power to heat ratio on the potential of the CHP system to reduce cost, emissions, and primary energy is investigated, and a graphical method is presented for examining the trade‐offs between power to heat ratio, base loading fraction, percentage of recovered heat used, and minimum ratios for cost, emissions, and primary energy. Copyright © 2014 John Wiley & Sons, Ltd.
Pedro J. Mago; Amanda D. Smith. Methodology to estimate the economic, emissions, and energy benefits from combined heat and power systems based on system component efficiencies. International Journal of Energy Research 2014, 38, 1457 -1466.
AMA StylePedro J. Mago, Amanda D. Smith. Methodology to estimate the economic, emissions, and energy benefits from combined heat and power systems based on system component efficiencies. International Journal of Energy Research. 2014; 38 (11):1457-1466.
Chicago/Turabian StylePedro J. Mago; Amanda D. Smith. 2014. "Methodology to estimate the economic, emissions, and energy benefits from combined heat and power systems based on system component efficiencies." International Journal of Energy Research 38, no. 11: 1457-1466.
The objective of this paper is to study the performance of a combined heat and power (CHP) system that uses two power generation units (PGU). In addition, the effect of thermal energy storage is evaluated for the proposed dual‐PGU CHP configuration (D‐CHP). Two scenarios are evaluated in this paper. In the first scenario, one PGU operates at base‐loading condition, while the second PGU operates following the electric load. In the second scenario, one PGU operates at base‐loading condition, while the second PGU operates following the thermal load. The D‐CHP system is modeled for the same building in four different locations to account for variation of the electric and thermal loads due to weather data. The D‐CHP system results are compared with the reference building by using conventional technology to determine the benefits of this proposed system in terms of operational cost and carbon dioxide emissions. The D‐CHP system results, with and without thermal storage, are also compared with that of single‐PGU CHP systems operating following the electric load (FEL), following the thermal load (FTL), and base‐loaded (BL). Results indicate that the D‐CHP system operating either FEL or FTL in general provides better results than a single‐PGU CHP system operating FEL, FTL, or BL. The addition of thermal storage enhances the potential benefits from D‐CHP system operation in terms of operational cost savings and emissions savings. Copyright © 2013 John Wiley & Sons, Ltd.
Pedro J. Mago; Rogelio Luck; Alta Knizley. Combined heat and power systems with dual power generation units and thermal storage. International Journal of Energy Research 2013, 38, 896 -907.
AMA StylePedro J. Mago, Rogelio Luck, Alta Knizley. Combined heat and power systems with dual power generation units and thermal storage. International Journal of Energy Research. 2013; 38 (7):896-907.
Chicago/Turabian StylePedro J. Mago; Rogelio Luck; Alta Knizley. 2013. "Combined heat and power systems with dual power generation units and thermal storage." International Journal of Energy Research 38, no. 7: 896-907.