scholarly journals BIPOLAR PLATES FOR ELECTROLYZERS AND FUEL CELLS – HOW INNOVATION MANAGEMENT IS AS A BASIS FOR SUCCESS THESE COMPONENTS

2021 ◽  
Vol 5 (6) ◽  
pp. 54-58
Author(s):  
Thorsten Hickmann
Keyword(s):  
Renewable Energy ◽  
Abrupt Change ◽  
Innovation Management ◽  
Energy Systems ◽  
Water Electrolysis ◽  
Electrical Energy ◽  
Decision Makers ◽  
Bipolar Plates ◽  
Storage Medium ◽  
Energy Conversion Systems

An almost abrupt change in attitude towards applications in the field of renewable energies has emerged in recent months, both among decision-makers in politics and in companies. [1] In particular, the topic of hydrogen production by electrolysis plays an eminently important role. In water electrolysis, water is split into its constituent ¬parts hydrogen and oxygen using electrical energy. The resulting hydrogen is of interest to future energy systems for a number of reasons, including the fact that hydrogen can serve as a storage medium for electrical energy from renewable energy conversion systems such as photovoltaic or wind turbines.

Recent Progress in Reducing the Uncertainty in and Improving Pyranometer Calibrations

2001 ◽  
Author(s):  
Daryl R. Myers ◽  
Thomas L. Stoffel ◽  
Ibrahim Reda ◽  
Stephen M. Wilcox ◽  
Afshin M. Andreas
Keyword(s):  
Renewable Energy ◽  
Energy Systems ◽  
Field Measurements ◽  
Photovoltaic Module ◽  
Distributed Energy ◽  
Climate Change Research ◽  
Renewable Energy Systems ◽  
Radiation Fluxes ◽  
Energy Conversion Systems ◽  
Array Performance

Abstract The Measurements and Instrumentation Team within the Distributed Energy Resources Center at the National Renewable Energy Laboratory, NREL, calibrates pyranometers for outdoor testing solar energy conversion systems. The team also supports climate change research programs. These activities led NREL to improve pyranometer calibrations. Low thermal-offset radiometers measuring the sky diffuse component of the reference solar irradiance removes bias errors on the order of 20 Watts per square meter (W/m2) in the calibration reference irradiance. Zenith angle dependent corrections to responsivities of pyranometers removes 15 to 30 W/m2 bias errors from field measurements. Detailed uncertainty analysis of our outdoor calibration process shows a 20% reduction in the uncertainty in the responsivity of pyranometers. These improvements affect photovoltaic module and array performance characterization, assessment of solar resources for design, sizing, and deployment of solar renewable energy systems, and ground-based validation of satellite-derived solar radiation fluxes.

scholarly journals Assessment of sustainability of different renewable energy systems based on life cycle exergy analysis

Tehnika ◽  
2021 ◽  
Vol 76 (5) ◽  
pp. 595-602
Author(s):  
Branislav Petrović ◽  
Milan Gojak
Keyword(s):  
Sustainable Development ◽  
Renewable Energy ◽  
Life Cycle ◽  
Exergy Analysis ◽  
Sustainability Assessment ◽  
Energy Systems ◽  
Electrical Energy ◽  
Energy System ◽  
Renewable Energy Resources ◽  
System Sustainability

The sustainable development of energy systems does not only involve the use of renewable energy resources but the increase in their efficiency as well, enabling society to maximise the benefits of their consumption. The production of electrical energy from clean and renewable sources contributes to lowered fossil fuel exploitation and the reduction of its damaging effect on the environment. This is a way to reach the global target of sustainable development - striking a balance between resource consumption and the achievable natural cycle regeneration. Environmental protection is in the focus of attention. Namely, when energy system sustainability is assessed, in addition to the ecological sustainability assessment (based on life cycle analysis - LCA), attention should be paid to the decrease in energy quality in energy processes (exergy loss). This paper presents the thermodynamic approach to energy system sustainability assessment by applying life cycle exergy analysis (LCEA). The key issue is the assessment of systems which use sustainable energy sources: the wind turbine and the stand-alone photovoltaic solar system.

Extended Exergy as a Locally Significant Environmental Indicator

2013 ◽  
Author(s):  
Enrico Sciubba
Keyword(s):  
Environmental Impact ◽  
Energy Systems ◽  
Detailed Examination ◽  
Environmental Indicators ◽  
Decision Makers ◽  
Evolutionary Patterns ◽  
Natural Systems ◽  
Industrial Energy ◽  
Energy Conversion Systems ◽  
Support Basis

The concept of “environmental impact” has evolved to encompass a multi-disciplinary and quite detailed examination of the local and global implications of the interactions of anthropic processes with the biosphere. Sets of quantitative measures of the interaction, called Environmental Indicators (EI), have been proposed with the intent of providing a synthetic, accurate and reliable decision support basis for planners and decision makers. This approach is not devoid of drawbacks: generality conflicts with specificity and it is often difficult to connect a local EI with a more global measure of environmental impact. Furthermore, several of the proposed EIs lack a sound physical basis (in particular, they are not always rigorously rooted on thermodynamics). This paper proposes a method to bridge both gaps by introducing an EI derived strictly from prime thermodynamic concepts (the extended exergy cost, EEC or cee) and by defining a procedure to apply it to local and global scales alike. It is argued that such an EI successfully solves the “externalities” problem for industrial energy conversion systems and that it can also be employed to assess the evolutionary patterns of natural systems. All applications to date demonstrate that cee is indeed a useful tool for the quantification of the primary equivalent resource costs and for their proper internalization in energy systems analyses.

scholarly journals Power Electronics in Renewable Energy Systems

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1852 ◽  
Author(s):  
Teuvo Suntio ◽  
Tuomas Messo
Keyword(s):  
Renewable Energy ◽  
Power Electronics ◽  
Rapid Growth ◽  
Energy Systems ◽  
Electrical Energy ◽  
Renewable Energy Systems ◽  
Electrical Grids

Renewable energy-based generation of electrical energy is currently experiencing rapid growth in electrical grids [...]

scholarly journals Electrical Energy Storage for Renewable Energy Systems

2012 ◽  
Author(s):  
C. R. Helms ◽  
K. J. Cho ◽  
John Ferraris ◽  
Ken Balkus ◽  
Yves Chabal ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Energy Storage ◽  
Energy Systems ◽  
Electrical Energy ◽  
Renewable Energy Systems ◽  
Electrical Energy Storage

Review on Power Electronics Circuits in Renewable Energy Systems

2017 ◽  
Vol 3 (7) ◽  
Author(s):  
Aakash Shukla ◽  
Dr Anula Khare
Keyword(s):  
Renewable Energy ◽  
Power Electronics ◽  
High Performance ◽  
Renewable Energy Sources ◽  
Energy Systems ◽  
Qualitative Description ◽  
Energy Sources ◽  
Smart Energy Management ◽  
Energy Conversion Systems ◽  
The Impact

The rapid increase in global energy consumption and the impact of greenhouse gas emissions has accelerated the transition towards greener energy sources. The need for distributed generation (DG) employing renewable energy sources such as wind, solar and fuel cells has gained significant momentum. Advanced power electronic systems, affordable high performance devices, and smart energy management principles are deemed to be an integral part of renewable, green and efficient energy systems. This paper briefly describes the attributes of DG. An overview of wind, fuel cell, solar based energy conversion systems has been presented. A qualitative description of the role of power electronics in wind, solar, and photovoltaic systems has been presented.

Recent Progress in Reducing the Uncertainty in and Improving Pyranometer Calibrations

2001 ◽  
Vol 124 (1) ◽  
pp. 44-50 ◽  
Author(s):  
Daryl R. Myers ◽  
Thomas L. Stoffel ◽  
Ibrahim Reda ◽  
Stephen M. Wilcox ◽  
Afshin M. Andreas
Keyword(s):  
Renewable Energy ◽  
Energy Systems ◽  
Field Measurements ◽  
Photovoltaic Module ◽  
Distributed Energy ◽  
Climate Change Research ◽  
Renewable Energy Systems ◽  
Radiation Fluxes ◽  
Energy Conversion Systems ◽  
Array Performance

The Measurements and Instrumentation Team within the Distributed Energy Resources Center at the National Renewable Energy Laboratory, NREL, calibrates pyranometers for outdoor testing solar energy conversion systems. The team also supports climate change research programs. These activities led NREL to improve pyranometer calibrations. Low thermal-offset radiometers measuring the sky diffuse component of the reference solar irradiance removes bias errors on the order of 20 Watts per square meter (W/m2) in the calibration reference irradiance. Zenith angle dependent corrections to responsivities of pyranometers removes 15 to 30 W/m2 bias errors from field measurements. Detailed uncertainty analysis of our outdoor calibration process shows a 20% reduction in the uncertainty in the responsivity of pyranometers. These improvements affect photovoltaic module and array performance characterization, assessment of solar resources for design, sizing, and deployment of solar renewable energy systems, and ground-based validation of satellite-derived solar radiation fluxes.

A Comparison of Indicators for Self-Sufficient Energy Systems

2016 ◽  
Vol 856 ◽  
pp. 11-19
Author(s):  
Eric Unterberger ◽  
Adam Wolf ◽  
Gunther Reinhart
Keyword(s):  
Renewable Energy ◽  
Flow Simulation ◽  
Energy Systems ◽  
Electrical Energy ◽  
Renewable Energy Systems ◽  
Self Sufficiency ◽  
Sufficient Energy ◽  
The Social ◽  
Green Factory ◽  
Set Up

Industry is one of the major energy consumers in Germany. In order to fulfil the social responsibility of the energy revolution, companies required to install and to use their own renewable energy. With the increasing set-up of renewable energy systems at the production site, these companies are interested in consuming most of the energy directly on-site. Based on a material flow simulation of the Green Factory Bavaria in Augsburg, this paper compares different indicators for the energy self-sufficiency. Finally the effect of electrical energy storage to increase the energy self-sufficiency is examined.

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