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Energy and the Environment
Published in Marc J. Assael, Geoffrey C. Maitland, Thomas Maskow, Urs von Stockar, William A. Wakeham, Stefan Will, Commonly Asked Questions in Thermodynamics, 2022
Marc J. Assael, Geoffrey C. Maitland, Thomas Maskow, Urs von Stockar, William A. Wakeham, Stefan Will
Truly “green hydrogen” requires the use of a carbon-free process, such as electrolysis powered by solar energy. Such a process is shown schematically in Figure 7.7, which illustrates a photovoltaic (PV) electrolysis system consisting of a multi-junction solar cell connected to two PEM electrolyzers in series. The general configuration for such a system is a sequence of electrolyzers powered by a bank of multi-junction solar panels. For simplicity, Figure 7.7 shows two PEM electrolyzers in series powered by a single triple-junction PV solar cell.
Role of Emerging Technologies in Energy Transformation and Development of Clean and Green Energy Solutions
Published in Anirbid Sircar, Gautami Tripathi, Namrata Bist, Kashish Ara Shakil, Mithileysh Sathiyanarayanan, Emerging Technologies for Sustainable and Smart Energy, 2022
Hydrogen is the most abundant element in solar system and the prime ingredient for fusion reaction in sun for solar energy generation. There is a global consensus on de-carbonization and energy transition, due to increase of greenhouse gases in atmosphere. Several governments are proposing green hydrogen initiatives to produce clean energy from hydrogen because it is environment friendly renewable energy source. Use of Hydrogen as industrial fuel to generate very high temperature heat is expected to commence commercially in next decade. The use of hydrogen as transport fuel is expected in next few years. With the initiatives of some biggest hydrogen project developers, the increase in green hydrogen production is expected to globally grow 50 fold in next six years.
Energy systems: integration, distribution and storage
Published in John Twidell, Renewable Energy Resources, 2021
Hydrogen is manufactured2 generally (i) directly from water by electrolysis, or (ii) predominantly as a by-product of fossil fuels (‘gray-hydrogen’ if mixed with CO and CO2). When produced with electricity and/or materials from renewable sources, it is known as ‘renewable/green hydrogen,’ so being a much-needed clean energy store.
Environmental assessment of hydrogen: does hydrogen matter for environmental efficiency improvement?
Published in Energy Sources, Part B: Economics, Planning, and Policy, 2023
Congyu Zhao, Kangyin Dong, Farhad Taghizadeh-Hesary
Technology-wise, green hydrogen is an important link between renewable energy and power, industry, construction, and transportation, providing a feasible way to replace traditional fossil energy such as coal, oil, and natural gas in these fields. Hence, relevant energy departments should pay attention to the development of renewable energy hydrogen production by the electrolysis of water and carbon dioxide technology, coupling hydrogen production by natural gas with CCUS. For example, a dual clean and low-carbon energy system, coupled with natural gas and hydrogen energy, can be built to expand the utilization of hydrogen energy and improve utilization efficiency. In terms of specific hydrogen energy production technology, the governments can encourage the demonstration of integrated optimization technology matching conventional electrolytic water hydrogen production technology with renewable energy power, and support low-carbon hydrogen production technology, such as solar photovoltaic water-splitting hydrogen production technology.
Grey, blue, and green hydrogen: A comprehensive review of production methods and prospects for zero-emission energy
Published in International Journal of Green Energy, 2023
Priyanka Saha, Faysal Ahamed Akash, Shaik Muntasir Shovon, Minhaj Uddin Monir, Mohammad Tofayal Ahmed, Mohammad Forrukh Hossain Khan, Shaheen M. Sarkar, Md. Kamrul Islam, Md. Mehedi Hasan, Dai-Viet N. Vo, Azrina Abd Aziz, Md. Jafar Hossain, Rafica Akter
Green hydrogen is an increasingly popular form of hydrogen that is produced from water through an electrolysis process using renewable energy. This form of hydrogen is considered essential for the transition to more sustainable energy and transportation systems. However, there are concerns about the lack of a common definition of low-carbon hydrogen and the need to establish a clear classification for clean, green or renewable hydrogen. In response, Furat, Anda, and Shafiullah (2020) introduced the Hydro-cleanness Index model.