The Experts below are selected from a list of 127110 Experts worldwide ranked by ideXlab platform
L Vanoli - One of the best experts on this subject based on the ideXlab platform.
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dynamic simulation of a novel high temperature solar trigeneration system based on concentrating photovoltaic thermal collectors
Energy, 2013Co-Authors: Francesco Calise, Massimo Dentice Daccadia, Adolfo Palombo, L VanoliAbstract:The paper is focused on the dynamic simulation of a Photovoltaic/Thermal collector (PVT) integrated in a high-temperature Solar Heating and Cooling (SHC) system. The system is based on the following main components: concentrating parabolic PVT (photovoltaic thermal) collectors, a double-stage LiBr-H2O absorption chiller, storage tanks, auxiliary heaters, balance of plant devices. The PVT is made-up by a parabolic dish concentrator and a triple-junction receiver. The polygeneration system provides electricity, space heating and cooling and domestic hot water for a given building, whose simulation is also included in the model. In particular, PVT produces electric energy, which is in part consumed by the building loads (lights and equipments), in part by the system parasitic loads, whereas the eventual excess is sold to the public grid. Simultaneously, the PVT provides the heat required to drive the absorption chiller. The system was simulated by means of a zero-dimensional transient model, that allows the evaluation of temperature profiles and also heat/electrical energy flows for whatever period of the year. It is also possible to evaluate the overall energetic and economic performance on whatever time basis (day, week, month, year, etc.). The economic results show that the system under investigation can be profitable, if a proper Funding Policy is available. The paper also includes an extensive parametric analysis aiming at evaluating the set of design and operating parameters (solar field area, tank volumes, set point temperatures, etc.) that maximize the energetic and/or economic performance of the system.
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design and dynamic simulation of a novel solar trigeneration system based on hybrid photovoltaic thermal collectors pvt
Energy Conversion and Management, 2012Co-Authors: Francesco Calise, Massimo Dentice Daccadia, L VanoliAbstract:Abstract In this paper, a Solar Heating and Cooling (SHC) system including photovoltaic/thermal (PVT) collectors is considered, implementing a novel polygeneration system producing electricity, space heating and cooling and domestic hot water. In particular, PVT collectors operating up to 80 °C are considered. A case study for a university building located in Naples (Italy) is developed and discussed. The system is mainly composed by: PVT collectors, a single-stage LiBr–H2O absorption chiller, storage tanks and auxiliary heaters. The system also includes additional balance-of-plant devices: heat exchangers, pumps, controllers, cooling tower, etc. The PVT produces electricity which is utilized in part by the building lights and equipments and in part by the system parasitic loads; the rest is eventually sold to the grid. Simultaneously, the PVT system provides the heat required to drive the absorption chiller. The system performance is analyzed from both energetic and economic points of view by means of a zero-dimensional transient simulation model, developed with TRNSYS. The economic results show that the system under investigation can be profitable, provided that an appropriate Funding Policy is available. In addition, the overall energetic and economic results are comparable to those reported in literature for similar systems.
Andreas Kurtz - One of the best experts on this subject based on the ideXlab platform.
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Scope and Impact of International Research in Human Pluripotent Stem Cells
Stem Cell Reviews and Reports, 2012Co-Authors: Peter Löser, Sabine Kobold, Anke Guhr, Franz-josef Müller, Andreas KurtzAbstract:In a recent study published in this journal it was claimed that the rate of publications from US-based authors in the human embryonic stem cell (hESC) research field was slowing or even declining from 2008 to 2010. It was assumed that this is the result of long-term effects of the Bush administration’s Funding Policy for hESC research and the uncertain Policy environment of recent years. In the present study, we analyzed a pool of more than 1,700 original hESC research papers published world-wide from 2007 to 2011. In contrast to the previous study, our results do not support the hypothesis of a decline in the productivity of US-based research but rather confirm a nearly unchanged leading position of US research in the hESC field with respect to both publication numbers and impact of research. Moreover, we analyzed about 500 papers reporting original research involving human induced pluripotent stem cells (hiPSCs) published through 2011 and found a dominant position of US research in this research field as well.
Francesco Calise - One of the best experts on this subject based on the ideXlab platform.
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dynamic simulation of a novel high temperature solar trigeneration system based on concentrating photovoltaic thermal collectors
Energy, 2013Co-Authors: Francesco Calise, Massimo Dentice Daccadia, Adolfo Palombo, L VanoliAbstract:The paper is focused on the dynamic simulation of a Photovoltaic/Thermal collector (PVT) integrated in a high-temperature Solar Heating and Cooling (SHC) system. The system is based on the following main components: concentrating parabolic PVT (photovoltaic thermal) collectors, a double-stage LiBr-H2O absorption chiller, storage tanks, auxiliary heaters, balance of plant devices. The PVT is made-up by a parabolic dish concentrator and a triple-junction receiver. The polygeneration system provides electricity, space heating and cooling and domestic hot water for a given building, whose simulation is also included in the model. In particular, PVT produces electric energy, which is in part consumed by the building loads (lights and equipments), in part by the system parasitic loads, whereas the eventual excess is sold to the public grid. Simultaneously, the PVT provides the heat required to drive the absorption chiller. The system was simulated by means of a zero-dimensional transient model, that allows the evaluation of temperature profiles and also heat/electrical energy flows for whatever period of the year. It is also possible to evaluate the overall energetic and economic performance on whatever time basis (day, week, month, year, etc.). The economic results show that the system under investigation can be profitable, if a proper Funding Policy is available. The paper also includes an extensive parametric analysis aiming at evaluating the set of design and operating parameters (solar field area, tank volumes, set point temperatures, etc.) that maximize the energetic and/or economic performance of the system.
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design and dynamic simulation of a novel solar trigeneration system based on hybrid photovoltaic thermal collectors pvt
Energy Conversion and Management, 2012Co-Authors: Francesco Calise, Massimo Dentice Daccadia, L VanoliAbstract:Abstract In this paper, a Solar Heating and Cooling (SHC) system including photovoltaic/thermal (PVT) collectors is considered, implementing a novel polygeneration system producing electricity, space heating and cooling and domestic hot water. In particular, PVT collectors operating up to 80 °C are considered. A case study for a university building located in Naples (Italy) is developed and discussed. The system is mainly composed by: PVT collectors, a single-stage LiBr–H2O absorption chiller, storage tanks and auxiliary heaters. The system also includes additional balance-of-plant devices: heat exchangers, pumps, controllers, cooling tower, etc. The PVT produces electricity which is utilized in part by the building lights and equipments and in part by the system parasitic loads; the rest is eventually sold to the grid. Simultaneously, the PVT system provides the heat required to drive the absorption chiller. The system performance is analyzed from both energetic and economic points of view by means of a zero-dimensional transient simulation model, developed with TRNSYS. The economic results show that the system under investigation can be profitable, provided that an appropriate Funding Policy is available. In addition, the overall energetic and economic results are comparable to those reported in literature for similar systems.
Scott Stern - One of the best experts on this subject based on the ideXlab platform.
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growing stem cells the impact of federal Funding Policy on the u s scientific frontier
Journal of Policy Analysis and Management, 2012Co-Authors: Jeffrey L Furman, Fiona Murray, Scott SternAbstract:This paper articulates a citation-based approach to science Policy evaluation and employs that approach to investigate the impact of the United States’ 2001 Policy regarding the federal Funding of human embryonic stem cell (hESC) research. We evaluate the impact of the Policy on the level of U.S. hESC research, the U.S. position at the knowledge frontier, and the strategic response of U.S. scientists. Consistent with recent research on the science of science and innovation Policy, we employ a difference-in-differences approach using bibliometric data with the aim of analyzing the causal impact of the Policy on cumulative research. Our estimates suggest that in the aftermath of the 2001 Policy, U.S. production of hESC research lagged 35 to 40 percent behind anticipated levels. However, this relative decline was largely concentrated in the years 2001 to 2003 and ameliorated over time. The rebound in U.S. hESC research after 2003 was driven by contributions by researchers at elite U.S. institutions and U.S. researchers who collaborated with international partners. The results suggest that scientists respond strategically to research Funding restrictions and that modest science Policy shifts can have a significant influence on the within-country composition of research and the pattern of global research collaboration.
Peter Löser - One of the best experts on this subject based on the ideXlab platform.
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Scope and Impact of International Research in Human Pluripotent Stem Cells
Stem Cell Reviews and Reports, 2012Co-Authors: Peter Löser, Sabine Kobold, Anke Guhr, Franz-josef Müller, Andreas KurtzAbstract:In a recent study published in this journal it was claimed that the rate of publications from US-based authors in the human embryonic stem cell (hESC) research field was slowing or even declining from 2008 to 2010. It was assumed that this is the result of long-term effects of the Bush administration’s Funding Policy for hESC research and the uncertain Policy environment of recent years. In the present study, we analyzed a pool of more than 1,700 original hESC research papers published world-wide from 2007 to 2011. In contrast to the previous study, our results do not support the hypothesis of a decline in the productivity of US-based research but rather confirm a nearly unchanged leading position of US research in the hESC field with respect to both publication numbers and impact of research. Moreover, we analyzed about 500 papers reporting original research involving human induced pluripotent stem cells (hiPSCs) published through 2011 and found a dominant position of US research in this research field as well.
