scholarly journals Shapes’ optimisation using numerical naval hydrodynamics of a Ro-Ro double ferry with electric propulsion to cross the Danube

2021 ◽  
Vol 44 ◽  
pp. 79-86
Author(s):  
Nichita Sava ◽  
Liviu Moise ◽  
Daniela-Ioana Tudose ◽  
Costel Iulian Mocanu ◽  
Eugen Gavan
Keyword(s):  
Electric Propulsion ◽  
Fossil Fuels ◽  
Optimal Shape ◽  
Floating Body ◽  
Inland Waters ◽  
Low Carbon ◽  
Fuel Gas ◽  
Reduce Emissions ◽  
Body Shapes ◽  
The Waves

One of the crucial problems of the 21st century is pollution. Regarding a low carbon footprint, thorough research efforts are being made to minimise fuel gas emissions. Ships, through the powers established for propulsion and the fossil fuels used, are some of the most toxic human inventions. Scientist in many European countries and beyond are developing studies either to reduce emissions from propulsion engines or to design body shapes of ships with low forward resistance and to find electric propulsion solutions. This paper carries out studies of naval hydrodynamics to find body shapes that generate the lowest resistance to advance. Thus, using hydrodynamic observations and with the help of the NUMECA calculation program, two different hulls are studied in order to establish the optimal shape with the lowest forward resistance. Furthermore, acknowledging the limited aquarium of the inland waters, an important aspect to approach is the size of the waves as well as their length. In order not to cause damage to existing shores and facilities, the waves produced by the floating body must have minimum heights and wavelengths.

The Environmental, Economic and Social Performance of Nuclear Technology in Australia

2021 ◽  
Author(s):  
Troy B Malatesta
Keyword(s):  
Nuclear Power ◽  
Fossil Fuels ◽  
Social Performance ◽  
Nuclear Industry ◽  
Environmental Benefits ◽  
Low Carbon ◽  
Levelized Cost Of Electricity ◽  
Energy Mix ◽  
Negative Perceptions ◽  
Reduce Emissions

Abstract The prominence of climate change is surging with Australia feeling the impacts of hotter and dryer climates. With 2030 approaching, Australia's promise to reduce emissions is seeming harder to achieve with their energy mix being dominated by fossil fuels. The development of SMR technology in the nuclear industry offers a possible solution for Australia to shift away from coal and gas energy sources and invest in low carbon nuclear technologies. SMR technology is suitable for the Australian context due to the number of remote locations, the size of the mining and processing industries and the minimal nuclear experience Australia has. This study aimed to quantify the environmental benefits of Australia incorporating nuclear power in their energy mix and to calculate the levelized cost of electricity of constructing a 684 MWe nuclear plant using the NuScale Module. Additionally, a survey was created to provide an insight into the Australian perception of energy generation and nuclear power. The responses showed the Australian attitudes towards nuclear power and the misconceptions that are resulting in negative perceptions and attitudes.

scholarly journals Decarbonizing Space and Water Heating in Temperate Climates: The Case for Electrification

Atmosphere ◽  
2019 ◽  
Vol 10 (8) ◽  
pp. 435 ◽  
Author(s):  
Imran Sheikh ◽  
Duncan Callaway
Keyword(s):  
Energy Efficiency ◽  
Emission Reduction ◽  
Carbon Emission ◽  
Fossil Fuels ◽  
Low Carbon ◽  
Synthetic Natural Gas ◽  
Carbon Reduction ◽  
Direct Combustion ◽  
Reduce Emissions ◽  
Heating Loads

In order to meet ambitious carbon reduction goals, direct combustion of fossil fuels in homes will need to largely cease. The largest portion of this reduction will likely come from energy efficiency, but efficiency alone will not be sufficient. In this paper we look specifically at California and build the case for why energy efficiency with electrification of heating is the most likely path to achieve the large carbon emission reduction needed from this sector. We examine alternative decarbonization strategies, such as solar thermal, biogas, synthetic natural gas and electrification and show why electrification is the most promising path. We evaluate these options across the dimensions of scale, cost, and suitability. We find that, while electrification has the potential to serve all heating loads, the other low-carbon options may serve only 2–70% of loads. We also expect that electrification could reduce emissions from this sector at a cost 25–90+% less than other options.

scholarly journals Emissions of an agricultural engine using blends of diesel and hydrous ethanol

2019 ◽  
Vol 40 (1) ◽  
pp. 7
Author(s):  
Marcelo Silveira de Farias ◽  
José Fernando Schlosser ◽  
Javier Solis Estrada ◽  
Gismael Francisco Perin ◽  
Alfran Tellechea Martini
Keyword(s):  
Internal Combustion Engines ◽  
Fossil Fuels ◽  
Renewable Energy Sources ◽  
Standard Procedure ◽  
Diesel Oil ◽  
K Value ◽  
Operating Modes ◽  
Diesel Cycle ◽  
Reduce Emissions ◽  
Hydrous Ethanol

The growing global demand of energy, the decrease of petroleum reserves and the current of environmental contamination problems, make it imperative to study renewable energy sources for use in internal combustion engines, in order to decrease the dependence on fossil fuels and reduce emissions of pollutant gases. This study aimed to evaluate the emissions of a diesel-cycle engine of an agricultural tractor that uses diesel S500 (B5) mixed with 3, 6, 9, 12 and 15% of hydrous ethanol. It determined emissions of CO2 (ppm), NOx (ppm), and opacity (k value) of gases. A standard procedure was applied considering eight operating modes (M1, M2, M3, M4, M5, M6, M7, and M8) by breaking with an electric dynamometer in a laboratory. The experimental design was completely randomized, with 60 replicates and a 6 x 8 factorial design. Greater opacity and gas emissions were observed when the engine operated with 3% ethanol, while lower emissions occurred with 12 and 15%. With these fuels, the reduction of opacity, CO2, and NOx, in relation to diesel oil, was 24.49 and 26.53%, 4.96 and 5.15%, and 6.59 and 9.70%, respectively. In conclusion, the addition of 12 and 15% ethanol in diesel oil significantly reduces engine emissions.

scholarly journals Modernization of the Public Transport Bus Fleet in the Context of Low-Carbon Development in Poland

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3295
Author(s):  
Maciej Dzikuć ◽  
Rafał Miśko ◽  
Szymon Szufa
Keyword(s):  
Coal Combustion ◽  
Electricity Generation ◽  
Urban Transport ◽  
Rolling Stock ◽  
Low Carbon ◽  
The Public ◽  
Low Carbon Development ◽  
Reduce Emissions ◽  
Excessive Noise

The development of urban transport in recent years has become one of the most important issues related to improving the quality of life in Polish cities. Excessive pollution in the form of greenhouse gases and other harmful substances from buses affects people’s health as does the excessive noise. This article analysed the measures being taken to reduce emissions, and the results showed that it is possible to reduce CO2 emissions by more than 28 thousand megagrams (Mg) per annum. Policymakers in Poland should consider limiting electricity generation through coal combustion and recognize, at least temporarily, CNG/LNG-powered buses as low-carbon rolling stock and co-finance their purchase and the necessary infrastructure.

Staged Premix EV Combustion in Alstom’s GT24 Gas Turbine Engine

2012 ◽  
Author(s):  
Daniel Guyot ◽  
Thiemo Meeuwissen ◽  
Dieter Rebhan
Keyword(s):  
Gas Turbine ◽  
Distribution System ◽  
Fuel Oil ◽  
Operational Flexibility ◽  
Nox Formation ◽  
Diffusion Type ◽  
Fuel Gas ◽  
Start Up ◽  
Reduce Emissions ◽  
Ev Burner

Reducing gas turbine emissions and increasing their operational flexibility are key targets in today’s gas turbine market. In order to further reduce emissions and increase the operational flexibility of its GT24, Alstom has introduced an internally staged premix system into the GT24’s EV combustor. This system features a rich premix mode for GT start-up and a lean premix mode for GT loading and baseload operation. The fuel gas is injected through two premix stages, one injecting fuel into the burner air slots and one injecting fuel into the centre of the burner cone. Both premix stages are in continuous operation throughout the entire operating range, i.e. from ignition to baseload, thus eliminating the previously used pilot operation during start-up with its diffusion-type flame and high levels of NOx formation. The staged EV combustion concept is today a standard on the current GT26 and GT24. The EV burners of the GT26 are identical to the GT24 and fully retrofittable into existing GT24 engines. Furthermore, engines operating only on fuel gas (i.e. no fuel oil operation) no longer require a nitrogen purge and blocking air system so that this system can be disconnected from the GT. Only minor changes to the existing GT24 EV combustor and fuel distribution system are required. This paper presents validation results for the staged EV burner obtained in a single burner test rig at full engine pressure, and in a GT24 field engine, which had been upgraded with the staged EV burner technology in order to reduce emissions and extend the combustor’s operational behavior.

scholarly journals Modelling and Cost Estimation for Conversion of GreenMethanol to Renewable Liquid Transport Fuels via Olefin Oligomerisation

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 1046
Author(s):  
Jenna Ruokonen ◽  
Harri Nieminen ◽  
Ahmed Rufai Dahiru ◽  
Arto Laari ◽  
Tuomas Koiranen ◽  
...  
Keyword(s):  
Economic Analysis ◽  
Process Simulation ◽  
Cost Estimation ◽  
Fossil Fuels ◽  
Transport Sector ◽  
Low Carbon ◽  
Fuel Price ◽  
Co2 Emission Reduction ◽  
Electrolytic Hydrogen ◽  
Paris Climate Agreement

The ambitious CO2 emission reduction targets for the transport sector set in the Paris Climate Agreement require low-carbon energy solutions that can be commissioned rapidly. The production of gasoline, kerosene, and diesel from renewable methanol using methanol-to-olefins (MTO) and Mobil’s Olefins to Gasoline and Distillate (MOGD) syntheses was investigated in this study via process simulation and economic analysis. The current work presents a process simulation model comprising liquid fuel production and heat integration. According to the economic analysis, the total cost of production was found to be 3409 €/tfuels (273 €/MWhLHV), corresponding to a renewable methanol price of 963 €/t (174 €/MWhLHV). The calculated fuel price is considerably higher than the current cost of fossil fuels and biofuel blending components. The price of renewable methanol, which is largely dictated by the cost of electrolytic hydrogen and renewable electricity, was found to be the most significant factor affecting the profitability of the MTO-MOGD plant. To reduce the price of renewable fuels and make them economically viable, it is recommended that the EU’s sustainable transport policies are enacted to allow flexible and practical solutions to reduce transport-related emissions within the member states.

scholarly journals Greenhouse gas emissions profiles of neighbourhoods in Durban, South Africa – an initial investigation

2017 ◽  
Vol 30 (1) ◽  
pp. 191-214 ◽  
Author(s):  
Meryl Jagarnath ◽  
Tirusha Thambiran
Keyword(s):  
Greenhouse Gas ◽  
Ghg Emissions ◽  
Mitigation Strategies ◽  
Low Carbon ◽  
Economic Activities ◽  
Emissions Inventory ◽  
High Emission ◽  
Development Goals ◽  
Reduce Emissions ◽  
The City

Because current emissions accounting approaches focus on an entire city, cities are often considered to be large emitters of greenhouse gas (GHG) emissions, with no attention to the variation within them. This makes it more difficult to identify climate change mitigation strategies that can simultaneously reduce emissions and address place-specific development challenges. In response to this gap, a bottom-up emissions inventory study was undertaken to identify high emission zones and development goals for the Durban metropolitan area (eThekwini Municipality). The study is the first attempt at creating a spatially disaggregated emissions inventory for key sectors in Durban. The results indicate that particular groups and economic activities are responsible for more emissions, and socio-spatial development and emission inequalities are found both within the city and within the high emission zone. This is valuable information for the municipality in tailoring mitigation efforts to reduce emissions and address development gaps for low-carbon spatial planning whilst contributing to objectives for social justice.

Renewable Energy and Government Support: Time to ‘Green’ the SCM Agreement?

2014 ◽  
Vol 14 (3) ◽  
pp. 479-506 ◽  
Author(s):  
SHERZOD SHADIKHODJAEV
Keyword(s):  
Renewable Energy ◽  
Fossil Fuels ◽  
Dispute Settlement ◽  
Government Support ◽  
Low Carbon ◽  
Multilateral Trade ◽  
Appellate Body ◽  
Trade Frictions ◽  
Rule Making ◽  
Support Time

AbstractMany governments provide subsidies to shift from ‘dirty’ but cheap fossil fuels to ‘clean’ but expensive renewable energy. Recently, public incentives in the renewable energy sector have been challenged through both dispute settlement procedures of the World Trade Organization and domestic countervailing duty investigations. One may expect that trade frictions in this field will intensify over time. This article argues that the Agreement on Subsidies and Countervailing Measures – a multilateral trade treaty on subsidization and anti-subsidy measures – should be revised to give more policy space to national authorities in implementing their low-carbon programmes. The Appellate Body made a few climate-friendly interpretations in Canada–Renewable Energy/Canada–Feed-In Tariff Program. It is now members’ turn to carry out meaningful rule-making reforms. This article explores some ways to ‘green’ the existing disciplines.

Alternative scenarios for the future of the Canadian boreal zone1

2019 ◽  
Vol 27 (2) ◽  
pp. 185-199 ◽  
Author(s):  
James W.N. Steenberg ◽  
Peter N. Duinker ◽  
Irena F. Creed ◽  
Jacqueline N. Serran ◽  
Camille Ouellet Dallaire
Keyword(s):  
Climate Change ◽  
Ecosystem Services ◽  
Adaptive Capacity ◽  
Fossil Fuels ◽  
Global Climate ◽  
Policy Implications ◽  
Low Carbon ◽  
Boreal Zone ◽  
Low Carbon Economy ◽  
Carbon Economy

In response to global climate change, Canada is transitioning towards a low-carbon economy and the need for policy approaches that are effective, equitable, coordinated, and both administratively and politically feasible is high. One point is clear; the transition is intimately tied to the vast supply of ecosystem services in the boreal zone of Canada. This paper describes four contrasting futures for the boreal zone using scenario analysis, which is a transdisciplinary, participatory approach that considers alternative futures and policy implications under conditions of high uncertainty and complexity. The two critical forces shaping the four scenarios are the global economy’s energy and society’s capacity to adapt. The six drivers of change are atmospheric change, the demand for provisioning ecosystem services, the demand for nonprovisioning ecosystem services, demographics, and social values, governance and geopolitics, and industrial innovation and infrastructure. The four scenarios include: (i) the Green Path, where a low-carbon economy is coupled with high adaptive capacity; (ii) the Uphill Climb, where a low-carbon economy is instead coupled with low adaptive capacity; (iii) the Carpool Lane, where society has a strong capacity to adapt but a reliance on fossil fuels; and (iv) the Slippery Slope, where there is both a high-carbon economy and a society with low adaptive capacity. The scenarios illustrate the importance of transitioning to a low-carbon economy and the role of society’s adaptive capacity in doing so. However, they also emphasize themes like social inequality and adverse environmental outcomes arising from the push towards climate change mitigation.

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