The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Pedro J Mago - One of the best experts on this subject based on the ideXlab platform.
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design and operation of increased Thermal Capacitance and dual Thermal storage and its effects on building energy dependence
Sustainable Energy Technologies and Assessments, 2019Co-Authors: Mary Wilson, Pedro J MagoAbstract:Abstract This research explores the design and operation of an increased Thermal Capacitance (ITC) and Thermal storage management (TSM) system for reducing building energy consumption associated with heating, cooling, and domestic hot water (DHW) usage. Thermal Capacitance is a controlling factor for phase shift and amplitude reductions of cyclical heat transfer due to weather, and control of the ITC through TSM improves upon the benefits offered by additional Capacitance. Using the transient energy modeling software TRNSYS, ITC is achieved by water circulating in copper pipes embedded in the walls of a three-story residential building. Temperature and season-controlled valves divert circulation to either the building shell, ground heat exchanger, solar panel, cold storage tank or hot storage tank. A phase change material is thoroughly mixed into the water storage tanks to allow a tank volume reduction without loss of Thermal storage. Proper design and operation of the ITC/TSM system are investigated through a parametric study of the water tank size, water mass flowrate, and solar panel size. These analyses are focused on reducing the overall building energy requirement associated with the heat pump and DHW usage. Results range from 24% to 35% energy savings for the evaluated parameter ranges.
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building energy management using increased Thermal Capacitance and Thermal storage management
Buildings, 2018Co-Authors: Mary Wilson, Rogelio Luck, Pedro J MagoAbstract: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.
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Parametric Analysis of a Passive Energy Management Through Increased Thermal Capacitance
The Open Mechanical Engineering Journal, 2016Co-Authors: Joseph Carpenter, Pedro J Mago, Rogelio LuckAbstract: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.
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a first order study of reduced energy consumption via increased Thermal Capacitance with Thermal storage management in a micro building
Energies, 2015Co-Authors: Mary Wilson, Rogelio Luck, Pedro J MagoAbstract: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%.
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passive energy management through increased Thermal Capacitance
Energy and Buildings, 2014Co-Authors: Joseph Carpenter, Pedro J Mago, Rogelio LuckAbstract:Abstract This paper investigates the potential of using passive energy management through increased Thermal Capacitance (ITC) on the building cooling load by circulating water through a piping system located in the building walls or ceiling and then through a water storage tank. The cooling load obtained from the application of the ITC on the building walls and the ceiling is compared with the cooling load of a reference building without ITC. The reference building, which is located in Atlanta, GA, as well as the building with the ITC are simulated using a transient building simulation software, TRNSYS, for the month of May. Several parameters that affect the performance of the proposed ITC are also analyzed, including the tank size, the mass flow rate of the working fluid, and initial working fluid temperature. In addition, the effect of the window-to-wall ratio was analyzed for the ITC case in the walls. It was found that as the window-to-wall ratio increases the amount of potential of the ITC to reduce the cooling load decreases. In general, results indicate that the application of ITC reduces the cooling load, with an application on the ceiling being the best scenario.
Mary Wilson - One of the best experts on this subject based on the ideXlab platform.
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design and operation of increased Thermal Capacitance and dual Thermal storage and its effects on building energy dependence
Sustainable Energy Technologies and Assessments, 2019Co-Authors: Mary Wilson, Pedro J MagoAbstract:Abstract This research explores the design and operation of an increased Thermal Capacitance (ITC) and Thermal storage management (TSM) system for reducing building energy consumption associated with heating, cooling, and domestic hot water (DHW) usage. Thermal Capacitance is a controlling factor for phase shift and amplitude reductions of cyclical heat transfer due to weather, and control of the ITC through TSM improves upon the benefits offered by additional Capacitance. Using the transient energy modeling software TRNSYS, ITC is achieved by water circulating in copper pipes embedded in the walls of a three-story residential building. Temperature and season-controlled valves divert circulation to either the building shell, ground heat exchanger, solar panel, cold storage tank or hot storage tank. A phase change material is thoroughly mixed into the water storage tanks to allow a tank volume reduction without loss of Thermal storage. Proper design and operation of the ITC/TSM system are investigated through a parametric study of the water tank size, water mass flowrate, and solar panel size. These analyses are focused on reducing the overall building energy requirement associated with the heat pump and DHW usage. Results range from 24% to 35% energy savings for the evaluated parameter ranges.
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building energy management using increased Thermal Capacitance and Thermal storage management
Buildings, 2018Co-Authors: Mary Wilson, Rogelio Luck, Pedro J MagoAbstract: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.
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a first order study of reduced energy consumption via increased Thermal Capacitance with Thermal storage management in a micro building
Energies, 2015Co-Authors: Mary Wilson, Rogelio Luck, Pedro J MagoAbstract: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%.
G Palasantzas - One of the best experts on this subject based on the ideXlab platform.
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thickness dependent Thermal Capacitance of thin films with rough boundaries
Solid State Communications, 2002Co-Authors: G PalasantzasAbstract:We investigated the thickness dependence of the Thermal Capacitance of thin films with evolving boundary roughness as a function of film thickness. Besides dynamic roughness evolution, also thickness variations of the film Thermal conductivity were taken into account for the more general case of polycrystalline films. Nevertheless, the roughness evolution with film thickness is shown to be the dominant factor, modified by details of the corresponding scattering mechanisms that determine charge and heat carrier transport at low film thickness in comparison with the heat carrier mean bulk mean free path.
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mound surface roughness effects on the Thermal Capacitance of thin films
Journal of Applied Physics, 2001Co-Authors: G Palasantzas, Th J M De HossonAbstract:We investigate the influence of roughness at a nanometer scale on the Thermal properties of thin films. It is shown that the roughness causes an increase of the Thermal Capacitance. For mound rough surfaces the increase of the Thermal Capacitance depends strongly on the relative magnitude of the average mound separation λ and the system correlation length ζ. Indeed, a rather complex behavior develops for ζ>λ, while for ζ<λ a smooth decrease of the Capacitance as a function of the average mound separation λ takes place. Finally, the roughness strongly affects the Thermal Capacitance as a function of the film thickness as long as ζ<λ, while a precise determination of the actual effect requires a more-detailed knowledge of the thickness dependence of the involved roughness parameters during film growth.
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Mound surface roughness effects on the Thermal Capacitance of thin films
Journal of Applied Physics, 2001Co-Authors: G Palasantzas, J.th.m. De HossonAbstract:We investigate the influence of roughness at a nanometer scale on the Thermal properties of thin films. It is shown that the roughness causes an increase of the Thermal Capacitance. For mound rough surfaces the increase of the Thermal Capacitance depends strongly on the relative magnitude of the average mound separation λ and the system correlation length ζ. Indeed, a rather complex behavior develops for ζ>λ, while for ζ
Rogelio Luck - One of the best experts on this subject based on the ideXlab platform.
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building energy management using increased Thermal Capacitance and Thermal storage management
Buildings, 2018Co-Authors: Mary Wilson, Rogelio Luck, Pedro J MagoAbstract: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.
-
Parametric Analysis of a Passive Energy Management Through Increased Thermal Capacitance
The Open Mechanical Engineering Journal, 2016Co-Authors: Joseph Carpenter, Pedro J Mago, Rogelio LuckAbstract: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.
-
a first order study of reduced energy consumption via increased Thermal Capacitance with Thermal storage management in a micro building
Energies, 2015Co-Authors: Mary Wilson, Rogelio Luck, Pedro J MagoAbstract: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%.
-
passive energy management through increased Thermal Capacitance
Energy and Buildings, 2014Co-Authors: Joseph Carpenter, Pedro J Mago, Rogelio LuckAbstract:Abstract This paper investigates the potential of using passive energy management through increased Thermal Capacitance (ITC) on the building cooling load by circulating water through a piping system located in the building walls or ceiling and then through a water storage tank. The cooling load obtained from the application of the ITC on the building walls and the ceiling is compared with the cooling load of a reference building without ITC. The reference building, which is located in Atlanta, GA, as well as the building with the ITC are simulated using a transient building simulation software, TRNSYS, for the month of May. Several parameters that affect the performance of the proposed ITC are also analyzed, including the tank size, the mass flow rate of the working fluid, and initial working fluid temperature. In addition, the effect of the window-to-wall ratio was analyzed for the ITC case in the walls. It was found that as the window-to-wall ratio increases the amount of potential of the ITC to reduce the cooling load decreases. In general, results indicate that the application of ITC reduces the cooling load, with an application on the ceiling being the best scenario.
Brian Sanders - One of the best experts on this subject based on the ideXlab platform.
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EXPERIMENTAL VALIDATION OF SOURCE TEMPERATURE MODULATION VIA A Thermal SWITCH IN Thermal ENERGY HARVESTING (PREPRINT)
2007Co-Authors: Robin Mccarty, Kevin Hallinan, Dylan Monaghan, Brian SandersAbstract:Abstract : This paper provides a description of research seeking to experimentally verify the effectiveness of a Thermal switch used in series with TE devices for waste heat recovery for constant and variable source heat input and for variable source Thermal Capacitance (mass). Using an experimental set-up comprised serially of a fixed heat source, a variable Thermal resistance air gap serving as a Thermal switch, a thermoelectric device and a heat sink, the time-averaged power output to power input ratios improved up to 15% and 30% respectively for constant and variable heat input in certain design space conditions. The experimental results, as supported by model predictions, suggest that the Thermal Capacitance of the heat source must be greater than the Thermal Capacitance of the TE device in order for Thermal switching to improve the time-averaged power output to power input ratios of waste heat recovery systems. The results have direct application to aircraft energy harvesting.
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Experimental Verification of Thermal Switch Effectiveness in Thermoelectric Energy Harvesting
Journal of Thermophysics and Heat Transfer, 2007Co-Authors: Robin Mccarty, Kevin Hallinan, Dylan Monaghan, Brian SandersAbstract:This paper presents research seeking to experimentally verify the effectiveness of a Thermal switch used in series with thermoelectric devices for waste heat recovery for constant and variable source heat input and for variable source Thermal Capacitance (mass). Using an experimental setup composed serially of a fixed heat source, a variable Thermal resistance air gap serving as a Thermal switch, a thermoelectric device, and a heat sink, the time-averaged power output to power input ratios improved up to 15 % and 30 %, respectively, for constant and variable heat input in certain design space conditions. The experimental results, as supported by model predictions, suggest that the Thermal Capacitance of the heat source must be greater than the Thermal Capacitance of the thermoelectric device in order for Thermal switching to improve the time-averaged power output to power input ratios of waste heat recovery systems. The results have direct application to aircraft energy harvesting.
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Experimental verification of source temperature modulation via a Thermal switch in thermoelectric energy harvesting
American Society of Mechanical Engineers Aerospace Division (Publication) AD, 2006Co-Authors: Robin Mccarty, Kevin Hallinan, Dylan Monaghan, Brian SandersAbstract:This paper provides a description of research seeking to experimentally verify the effectiveness of a Thermal switch used in series with TE devices for waste heat recovery for constant and variable source heat input, and for variable source Thermal Capacitance (mass). Using an experimental set-up comprised serially of a fixed heat source, a variable Thermal resistance air gap serving as a Thermal switch, a thermoelectric device and a heat sink mounted on a translation stage, the time-averaged power output to power input ratios improved up to 15% and 30% respectively for constant and variable heat input in certain design space conditions. The experimental results, as supported by model predictions, suggest that the Thermal Capacitance of the heat source must be greater than the Thermal Capacitance of the TE device in order for Thermal switching to improve the time-averaged power output to power input ratios of waste heat recovery systems. Copyright ? 2006 by ASME.
