The Experts below are selected from a list of 19647 Experts worldwide ranked by ideXlab platform
Konstantinos Braimakis - One of the best experts on this subject based on the ideXlab platform.
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energy exergy analysis and economic investigation of a cogeneration and trigeneration orc vcc hybrid system utilizing biomass fuel and solar power
Energy Conversion and Management, 2016Co-Authors: Sotirios Karellas, Konstantinos BraimakisAbstract:Abstract The purpose of the present work is the thermodynamic modeling and economic analysis of a micro-scale tri/co-generation system capable of combined heat and power production and refrigeration, based on the joint Operation of an Organic Rankine Cycle (ORC) and a Vapor Compression Cycle (VCC). The ORC expander, VCC compressor and electricity generator are connected to the same shaft. The condensation of both cycles takes place under a common pressure in a single condenser. A biomass boiler together with a module of Parabolic-Trough Collectors (PTC) provides heat to the ORC via two distinct intermediate pressurized water circuits. In trigeneration mode (Summer Operation), a portion of the power produced by the ORC expander is consumed by the VCC compressor, while any surplus power is converted to electricity. The heat generated in the condenser of the system is used to meet hot water demand. In cogeneration mode (winter Operation) the VCC is disconnected, since no refrigeration is necessary. The performance of the system is assessed for subcritical Operation pressures for the organic medium R245fa. Investigations on the effect of various parameters, such as condensation and evaporation temperatures on the system performance are carried out. The impact of superheating and installing a recuperator is also examined. In a base case scenario (evaporation temperature at 90 °C without superheating) assuming an overall 50 kW th heat input and a cooling load of 5 kW th (during the Summer), the net electric efficiency is 2.38%, with an electricity output equal to 1.42 kW e and a heating output of 53.5 kW th . The exergy efficiency of the ORC was estimated at about 7%. An economic analysis of the system is carried out for a case study considering a typical apartment block on a Greek Island, assuming PTC area of 50 m 2 . The savings in fuel oil and electricity consumption account for an IRR around 12%, with a payback period of 7 years.
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Energy–exergy analysis and economic investigation of a cogeneration and trigeneration ORC–VCC hybrid system utilizing biomass fuel and solar power
Energy Conversion and Management, 2016Co-Authors: Sotirios Karellas, Konstantinos BraimakisAbstract:Abstract The purpose of the present work is the thermodynamic modeling and economic analysis of a micro-scale tri/co-generation system capable of combined heat and power production and refrigeration, based on the joint Operation of an Organic Rankine Cycle (ORC) and a Vapor Compression Cycle (VCC). The ORC expander, VCC compressor and electricity generator are connected to the same shaft. The condensation of both cycles takes place under a common pressure in a single condenser. A biomass boiler together with a module of Parabolic-Trough Collectors (PTC) provides heat to the ORC via two distinct intermediate pressurized water circuits. In trigeneration mode (Summer Operation), a portion of the power produced by the ORC expander is consumed by the VCC compressor, while any surplus power is converted to electricity. The heat generated in the condenser of the system is used to meet hot water demand. In cogeneration mode (winter Operation) the VCC is disconnected, since no refrigeration is necessary. The performance of the system is assessed for subcritical Operation pressures for the organic medium R245fa. Investigations on the effect of various parameters, such as condensation and evaporation temperatures on the system performance are carried out. The impact of superheating and installing a recuperator is also examined. In a base case scenario (evaporation temperature at 90 °C without superheating) assuming an overall 50 kW th heat input and a cooling load of 5 kW th (during the Summer), the net electric efficiency is 2.38%, with an electricity output equal to 1.42 kW e and a heating output of 53.5 kW th . The exergy efficiency of the ORC was estimated at about 7%. An economic analysis of the system is carried out for a case study considering a typical apartment block on a Greek Island, assuming PTC area of 50 m 2 . The savings in fuel oil and electricity consumption account for an IRR around 12%, with a payback period of 7 years.
Robert Santini - One of the best experts on this subject based on the ideXlab platform.
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Development of an autonomous sea ice tethered buoy for the study of ocean-atmosphere-sea ice-snow pack interactions: The O-buoy
Atmospheric Measurement Techniques, 2010Co-Authors: T. N. Knepp, D. Donohoue, J. Bottenheim, S. Netcheva, Morten Carlsen, Patricia A Matrai, D. Carlson, Gernot E Friederich, Donald K. Perovich, Robert SantiniAbstract:A buoy based instrument platform (the "O-buoy") was designed, constructed, and field tested for year-round measurement of ozone, bromine monoxide, carbon dioxide, and meteorological variables over Arctic sea ice. The O-buoy operated in an autonomous manner with daily, bi-directional data transmissions using Iridium satellite communication. The O-buoy was equipped with three power sources: primary lithium-ion battery packs, rechargeable lead acid packs, and solar panels that recharge the lead acid packs, and can fully power the O-buoy during Summer Operation. This system was designed to operate under the harsh conditions present in the Arctic, with minimal direct human interaction, to aid in our understanding of the atmospheric chemistry that occurs in this remote region of the world. The current design requires approximately yearly maintenance limited by the lifetime of the primary power supply. The O-buoy system was field tested in Elson Lagoon, Barrow, Alaska from February to May 2009, and deployed in the Beaufort Sea in October 2009. Here, we describe the design and present preliminary data.
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Development of an autonomous sea ice tethered buoy for the study of ocean-atmosphere-sea ice-snow pack interactions: the O-buoy
Atmospheric Measurement Techniques Discussions, 2009Co-Authors: T. N. Knepp, D. Donohoue, J. Bottenheim, S. Netcheva, Morten Carlsen, Patricia A Matrai, D. Carlson, Gernot E Friederich, Donald K. Perovich, Robert SantiniAbstract:Abstract. A buoy based instrument platform (the "O-buoy") was designed, constructed, and field tested for year-round measurement of ozone, bromine monoxide, carbon dioxide, and meteorological variables over Arctic sea ice. The O-buoy operated in an autonomous manner with daily, bi-directional data transmissions using Iridium satellite communication. The O-buoy was equipped with three power sources: primary lithium-ion battery packs, rechargeable lead acid packs, and solar panels that recharge the lead acid packs, and can fully power the O-buoy during Summer Operation. This system was designed to operate under the harsh conditions present in the Arctic, with minimal direct human interaction, to aid in our understanding of the atmospheric chemistry that occurs in this remote region of the world. The current design requires approximately yearly maintenance limited by the lifetime of the primary power supply. The O-buoy system was field tested in Elson Lagoon, Barrow, Alaska from February to May 2009, and here we describe the design and present preliminary data.
Chi Chen - One of the best experts on this subject based on the ideXlab platform.
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experimental study and performance analysis of a thermoelectric cooling and heating system driven by a photovoltaic thermal system in Summer and winter Operation modes
Energy Conversion and Management, 2014Co-Authors: Jinzhi Zhou, Chi ChenAbstract:Abstract This paper presents theoretical and experimental investigations of the winter Operation mode of a thermoelectric cooling and heating system driven by a heat pipe photovoltaic/thermal (PV/T) panel. And the energy and exergy analysis of this system in Summer and winter Operation modes are also done. The winter Operation mode of this system is tested in an experimental room which temperature is controlled at 18 °C. The results indicate the average coefficient of performance (COP) of thermoelectric module of this system can be about 1.7, the electrical efficiency of the PV/T panel can reach 16.7%, and the thermal efficiency of this system can reach 23.5%. The energy and exergy analysis show the energetic efficiency of the system in Summer Operation mode is higher than that of it in winter Operation mode, but the exergetic efficiency in Summer Operation mode is lower than that in winter Operation mode, on the contrary.
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Experimental study and performance analysis of a thermoelectric cooling and heating system driven by a photovoltaic/thermal system in Summer and winter Operation modes
Energy Conversion and Management, 2014Co-Authors: Jinzhi Zhou, Chi ChenAbstract:Abstract This paper presents theoretical and experimental investigations of the winter Operation mode of a thermoelectric cooling and heating system driven by a heat pipe photovoltaic/thermal (PV/T) panel. And the energy and exergy analysis of this system in Summer and winter Operation modes are also done. The winter Operation mode of this system is tested in an experimental room which temperature is controlled at 18 °C. The results indicate the average coefficient of performance (COP) of thermoelectric module of this system can be about 1.7, the electrical efficiency of the PV/T panel can reach 16.7%, and the thermal efficiency of this system can reach 23.5%. The energy and exergy analysis show the energetic efficiency of the system in Summer Operation mode is higher than that of it in winter Operation mode, but the exergetic efficiency in Summer Operation mode is lower than that in winter Operation mode, on the contrary.
Sotirios Karellas - One of the best experts on this subject based on the ideXlab platform.
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energy exergy analysis and economic investigation of a cogeneration and trigeneration orc vcc hybrid system utilizing biomass fuel and solar power
Energy Conversion and Management, 2016Co-Authors: Sotirios Karellas, Konstantinos BraimakisAbstract:Abstract The purpose of the present work is the thermodynamic modeling and economic analysis of a micro-scale tri/co-generation system capable of combined heat and power production and refrigeration, based on the joint Operation of an Organic Rankine Cycle (ORC) and a Vapor Compression Cycle (VCC). The ORC expander, VCC compressor and electricity generator are connected to the same shaft. The condensation of both cycles takes place under a common pressure in a single condenser. A biomass boiler together with a module of Parabolic-Trough Collectors (PTC) provides heat to the ORC via two distinct intermediate pressurized water circuits. In trigeneration mode (Summer Operation), a portion of the power produced by the ORC expander is consumed by the VCC compressor, while any surplus power is converted to electricity. The heat generated in the condenser of the system is used to meet hot water demand. In cogeneration mode (winter Operation) the VCC is disconnected, since no refrigeration is necessary. The performance of the system is assessed for subcritical Operation pressures for the organic medium R245fa. Investigations on the effect of various parameters, such as condensation and evaporation temperatures on the system performance are carried out. The impact of superheating and installing a recuperator is also examined. In a base case scenario (evaporation temperature at 90 °C without superheating) assuming an overall 50 kW th heat input and a cooling load of 5 kW th (during the Summer), the net electric efficiency is 2.38%, with an electricity output equal to 1.42 kW e and a heating output of 53.5 kW th . The exergy efficiency of the ORC was estimated at about 7%. An economic analysis of the system is carried out for a case study considering a typical apartment block on a Greek Island, assuming PTC area of 50 m 2 . The savings in fuel oil and electricity consumption account for an IRR around 12%, with a payback period of 7 years.
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Energy–exergy analysis and economic investigation of a cogeneration and trigeneration ORC–VCC hybrid system utilizing biomass fuel and solar power
Energy Conversion and Management, 2016Co-Authors: Sotirios Karellas, Konstantinos BraimakisAbstract:Abstract The purpose of the present work is the thermodynamic modeling and economic analysis of a micro-scale tri/co-generation system capable of combined heat and power production and refrigeration, based on the joint Operation of an Organic Rankine Cycle (ORC) and a Vapor Compression Cycle (VCC). The ORC expander, VCC compressor and electricity generator are connected to the same shaft. The condensation of both cycles takes place under a common pressure in a single condenser. A biomass boiler together with a module of Parabolic-Trough Collectors (PTC) provides heat to the ORC via two distinct intermediate pressurized water circuits. In trigeneration mode (Summer Operation), a portion of the power produced by the ORC expander is consumed by the VCC compressor, while any surplus power is converted to electricity. The heat generated in the condenser of the system is used to meet hot water demand. In cogeneration mode (winter Operation) the VCC is disconnected, since no refrigeration is necessary. The performance of the system is assessed for subcritical Operation pressures for the organic medium R245fa. Investigations on the effect of various parameters, such as condensation and evaporation temperatures on the system performance are carried out. The impact of superheating and installing a recuperator is also examined. In a base case scenario (evaporation temperature at 90 °C without superheating) assuming an overall 50 kW th heat input and a cooling load of 5 kW th (during the Summer), the net electric efficiency is 2.38%, with an electricity output equal to 1.42 kW e and a heating output of 53.5 kW th . The exergy efficiency of the ORC was estimated at about 7%. An economic analysis of the system is carried out for a case study considering a typical apartment block on a Greek Island, assuming PTC area of 50 m 2 . The savings in fuel oil and electricity consumption account for an IRR around 12%, with a payback period of 7 years.
T. N. Knepp - One of the best experts on this subject based on the ideXlab platform.
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Development of an autonomous sea ice tethered buoy for the study of ocean-atmosphere-sea ice-snow pack interactions: The O-buoy
Atmospheric Measurement Techniques, 2010Co-Authors: T. N. Knepp, D. Donohoue, J. Bottenheim, S. Netcheva, Morten Carlsen, Patricia A Matrai, D. Carlson, Gernot E Friederich, Donald K. Perovich, Robert SantiniAbstract:A buoy based instrument platform (the "O-buoy") was designed, constructed, and field tested for year-round measurement of ozone, bromine monoxide, carbon dioxide, and meteorological variables over Arctic sea ice. The O-buoy operated in an autonomous manner with daily, bi-directional data transmissions using Iridium satellite communication. The O-buoy was equipped with three power sources: primary lithium-ion battery packs, rechargeable lead acid packs, and solar panels that recharge the lead acid packs, and can fully power the O-buoy during Summer Operation. This system was designed to operate under the harsh conditions present in the Arctic, with minimal direct human interaction, to aid in our understanding of the atmospheric chemistry that occurs in this remote region of the world. The current design requires approximately yearly maintenance limited by the lifetime of the primary power supply. The O-buoy system was field tested in Elson Lagoon, Barrow, Alaska from February to May 2009, and deployed in the Beaufort Sea in October 2009. Here, we describe the design and present preliminary data.
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Development of an autonomous sea ice tethered buoy for the study of ocean-atmosphere-sea ice-snow pack interactions: the O-buoy
Atmospheric Measurement Techniques Discussions, 2009Co-Authors: T. N. Knepp, D. Donohoue, J. Bottenheim, S. Netcheva, Morten Carlsen, Patricia A Matrai, D. Carlson, Gernot E Friederich, Donald K. Perovich, Robert SantiniAbstract:Abstract. A buoy based instrument platform (the "O-buoy") was designed, constructed, and field tested for year-round measurement of ozone, bromine monoxide, carbon dioxide, and meteorological variables over Arctic sea ice. The O-buoy operated in an autonomous manner with daily, bi-directional data transmissions using Iridium satellite communication. The O-buoy was equipped with three power sources: primary lithium-ion battery packs, rechargeable lead acid packs, and solar panels that recharge the lead acid packs, and can fully power the O-buoy during Summer Operation. This system was designed to operate under the harsh conditions present in the Arctic, with minimal direct human interaction, to aid in our understanding of the atmospheric chemistry that occurs in this remote region of the world. The current design requires approximately yearly maintenance limited by the lifetime of the primary power supply. The O-buoy system was field tested in Elson Lagoon, Barrow, Alaska from February to May 2009, and here we describe the design and present preliminary data.
