scholarly journals REA: Resource Exergy Analysis - A basic guideline for application focusing on energy systems evaluation

2022 ◽  
Author(s):  
Andrej Jentsch
Keyword(s):  
Global Economy ◽  
Fossil Fuels ◽  
Exergy Analysis ◽  
Ghg Emissions ◽  
Energy Systems ◽  
Energy System ◽  
Primary Energy ◽  
Resource Consumption ◽  
Decision Makers ◽  
Climate Targets

Abstract This publication provides a basic guideline to the application of Resource Exergy Analysis (REA) with a focus on energy systems evaluation. REA is a proven application of exergy analysis to the field of technology comparison.REA aims to help decision makers to obtain an indicator in addition to GHG emissions, that is grounded in science, namely Resource Consumption.Even if an energy system uses GHG-free energy increased Resource Consumption likely increases the need for fossil fuels and thus GHG emissions of the global economy. Resource Consumption can replace the less comprehensive Primary Energy Consumption as an indictor and reduce the risk of suboptimal decisions.Evaluating energy systems using REA is key to ensure that climate targets are reached in time.

scholarly journals REA: Resource Exergy Analysis - A basic guidline for application

2021 ◽  
Author(s):  
Andrej Jentsch
Keyword(s):  
Energy Consumption ◽  
Exergy Analysis ◽  
Ghg Emissions ◽  
Energy Systems ◽  
Primary Energy ◽  
Decision Makers ◽  
Primary Energy Consumption ◽  
Climate Targets ◽  
Exergy Consumption ◽  
Technology Comparison

Abstract This publication provides a basic guideline to the application of Resource Exergy Analysis (REA). REA is a proven application of exergy analysis to the field of technology comparison. REA aims to help decision makers to obtain an indicator in addition to GHG emissions, that is grounded in science. Resource exergy consumption can replace the less comprehensive primary energy consumption as an indictor and reduce the risk of suboptimal decisions. Evaluating energy systems using REA is key to ensure that climate targets are reached in time.

scholarly journals Dynamic Modelling of LNG Powered Combined Energy Systems in Port Areas

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3640
Author(s):  
Davide Borelli ◽  
Francesco Devia ◽  
Corrado Schenone ◽  
Federico Silenzi ◽  
Luca A. Tagliafico
Keyword(s):  
Energy Savings ◽  
Ghg Emissions ◽  
Dynamic Modelling ◽  
Energy Systems ◽  
Energy System ◽  
Primary Energy ◽  
Time Behavior ◽  
Vapor Compression Refrigeration Cycle ◽  
Integrated Energy System ◽  
Energy Share

Liquefied Natural Gas (LNG) is a crucial resource to reduce the environmental impact of fossil-fueled vehicles, especially with regards to maritime transport, where LNG is increasingly used for ship bunkering. The present paper gives insights on how the installation of LNG tanks inside harbors can be capitalized to increase the energy efficiency of port cities and reduce GHG emissions. To this purpose, a novel integrated energy system is introduced. The Boil Off Gas (BOG) from LNG tanks is exploited in a combined plant, where heat and power are produced by a regenerated gas turbine cycle; at the same time, cold exergy from LNG regasification contributes to an increase in the efficiency of a vapor compression refrigeration cycle. In the paper, the integrated energy system is simulated by means of dynamic modeling under daily variable working conditions. Results confirm that the model is stable and able to determine the time behavior of the integrated plant. Energy saving is evaluated, and daily trends of key thermophysical parameters are reported and discussed. The analysis of thermal recovering from the flue gases shows that it is possible to recover a large energy share from the turbine exhausts. Hence, the system can generate electricity for port cold ironing and, through a secondary brine loop, cold exergy for a refrigeration plant. Overall, the proposed solution allows primary energy savings up to 22% when compared with equivalent standard technologies with the same final user needs. The exploitation of an LNG regasification process through smart integration of energy systems and implementation of efficient energy grids can contribute to greener energy management in harbors.

scholarly journals REA: Resource Exergy Analysis - A basic guidline for application

2021 ◽  
Author(s):  
Andrej Jentsch
Keyword(s):  
Energy Consumption ◽  
Exergy Analysis ◽  
Ghg Emissions ◽  
Primary Energy ◽  
Decision Makers ◽  
Primary Energy Consumption ◽  
Exergy Consumption ◽  
Technology Comparison

Abstract This publication provides a basic guideline to the application of Resource Exergy Analysis (REA). REA is an application of exergy analysis to the field of technology comparison. REA aims to help decision makers to obtain an indicator in addition to GHG emissions, that is grounded in science. Resource exergy consumption can replace the less comprehensive primary energy consumption as an indictor and reduce the risk of suboptimal decisions.

scholarly journals Sustainable energy path

2005 ◽  
Vol 9 (3) ◽  
pp. 7-14 ◽  
Author(s):  
Hiromi Yamamoto ◽  
Kenji Yamaji
Keyword(s):  
Energy Consumption ◽  
Co2 Emissions ◽  
Fossil Fuels ◽  
Cost Minimization ◽  
Sustainable Energy ◽  
Energy Systems ◽  
Primary Energy ◽  
Primary Energy Consumption ◽  
Photo Voltaic ◽  
Global Energy Supply

The uses of fossil fuels cause not only the resources exhaustion but also the environmental problems such as global warming. The purposes of this study are to evaluate paths to ward sustainable energy systems and roles of each renewable. In order to realize the purposes, the authors developed the global land use and energy model that figured the global energy supply systems in the future considering the cost minimization. Using the model the authors conducted a simulation in C30R scenario, which is a kind of strict CO2 emission limit scenarios and reduced CO2 emissions by 30% compared with Kyoto protocol forever scenario, and obtained the following results. In C30R scenario bio energy will supply 33% of all the primary energy consumption. How ever, wind and photo voltaic will supply 1.8% and 1.4% of all the primary energy consumption, respectively, because of the limits of power grid stability. The results imply that the strict limits of CO2 emissions are not sufficient to achieve the complete renewable energy systems. In order to use wind and photo voltaic as major energy resources we need not only to reduce the plant costs but also to develop unconventional renewable technologies. .

scholarly journals An Assessment Of Microalgal Biodiesel With Acetone, Butanol and Ethanol Using LIfe Cycle Assessment (LCA) Methodology

2021 ◽  
Author(s):  
Cherilyn Dignan
Keyword(s):  
Fossil Fuels ◽  
Ghg Emissions ◽  
Primary Energy ◽  
Biofuel Production ◽  
Production Model ◽  
Lca Methodology ◽  
Fuel Production ◽  
Renewable Fuel ◽  
Production Processes ◽  
Microalgal Biodiesel

Canada, as one of the largest producers and consumers of fossil fuels per capita on the planet, is attempting to reduce greenhouse gas (GHG) emissions. In order to accomplish this, fuel alternatives, such as biofuel, are required. Accordingly, this study uses LCA methodology to quantify the GHG impact of a unique biofuel production model. This unique model produces biodiesel (BD), acetone, butanol and ethanol (ABE) from microalgae and assesses the process GHG impact against other microalgal BD production processes. This study’s microalgal BD and ABE production process produces 76 kgCO2e per functional unit, whereas other comparable microalgal BD production processes produce between 3.7 and 85 kgCO2e. Overall, this study clarifies that without the development of versatile infrastructure to accommodate biofuel production, LCA studies will continue to find renewable fuel production processes net GHG positive for the simple reason that fossil resources are still the primary energy source.

Analysis of Energy System in South Africa Using Exponential Smoothing Approach and Regression Technique

2016 ◽  
Vol 5 (3) ◽  
pp. 51-67
Author(s):  
Mohammad Mehdi Ghiasi ◽  
Alireza Aslani ◽  
Younes Noorollahi
Keyword(s):  
South Africa ◽  
Growth Rate ◽  
Energy Demand ◽  
Nuclear Energy ◽  
Fossil Fuels ◽  
Energy System ◽  
Primary Energy ◽  
Exponential Smoothing ◽  
Industrial Growth ◽  
Simple Exponential Smoothing

The energy demand has increased dramatically in the recent decades. Due to the limitations and environmental effects of fossil fuels, secure level of energy supply is vital for economic and social development. This work is to review the energy sector in South Africa. After that, the consumptions of coal, oil, natural gas, and nuclear energy are estimated by employing simple exponential smoothing methodology. Finding shows that the primary energy consumption in the South Africa is correlated as a function of population growth rate, industrial growth rate, and GDP.

Hydrogen: A Very Promising Energy Carrier for the Future

2002 ◽  
Author(s):  
Xenophon K. Kakatsios
Keyword(s):  
Energy Consumption ◽  
Nuclear Power ◽  
Fossil Fuels ◽  
Global Climate ◽  
Clean Energy ◽  
Energy System ◽  
Primary Energy ◽  
Energy Carrier ◽  
Current Status ◽  
The Future

As we enter the new century, new fuels may be required for both stationary power and transportation to ameliorate the triple threats of local air pollution, global climate change and dependence on unstable nations for imported oil. Shifting away from fossil fuels may be essential within decades if citizens in the developing world achieve even a significant fraction of the per capita energy consumption enjoyed by the industrial nations. Business-as-usual or evolutionary shifts in energy consumption patterns may not be adequate. New paradigms and new energy initiatives may be required to protect the environment while providing the energy services we have come to expect. Hydrogen could play a significant role as a clean energy carrier in the future for both stationary and transportation markets. Produced from renewable energy or nuclear power, hydrogen could become the backbone of a truly sustainable energy future – an energy system that consumes no non-renewable resources and creates no pollution or greenhouse gases of any type during operation. However, to achieve this potential, hydrogen must overcome serious economic, technological and safety perception barriers before it can displace fossil fuels as the primary energy carrier throughout the world. In this paper we explore the current status of hydrogen and fuel cell systems compared to other fuel options for reducing pollution, greenhouse gas emissions and suggest the introduction of hydrogen into the energy economy.

scholarly journals Applications of solar and wind renewable energy in agriculture: A review

2019 ◽  
Vol 102 (2) ◽  
pp. 127-140 ◽  
Author(s):  
Yuliana de Jesus Acosta-Silva ◽  
Irineo Torres-Pacheco ◽  
Yasuhiro Matsumoto ◽  
Manuel Toledano-Ayala ◽  
Genaro Martín Soto-Zarazúa ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Fossil Fuels ◽  
Energy Systems ◽  
Energy System ◽  
Climate Control ◽  
Greenhouse Production ◽  
Renewable Energy Systems ◽  
Greenhouse Crops ◽  
Renewable Energy System ◽  
The Impact

The growing demand for food and the unstable price of fossil fuels has led to the search for environmentally friendly sources of energy. Energy is one of the largest overhead costs in the production of greenhouse crops for favorable climate control. The use of wind–solar renewable energy system for the control of greenhouse environments reduces fuel consumption and so enhances the sustainability of greenhouse production. This review describes the impact of solar–wind renewable energy systems in agricultural greenhouses.

A Software Optimization of the Solar Energy System Performance

2014 ◽  
Vol 899 ◽  
pp. 199-204
Author(s):  
Lukáš Skalík ◽  
Otília Lulkovičová
Keyword(s):  
Solar System ◽  
Solar Energy ◽  
System Performance ◽  
Solar Collector ◽  
Energy Demand ◽  
Fossil Fuels ◽  
Thermal Protection ◽  
Energy Systems ◽  
Energy System ◽  
Hot Water

The energy demand of buildings represents in the balance of heat use and heat consumption of energy complex in the Slovak national economy second largest savings potential. Their complex energy demands is the sum of total investment input to ensure thermal protection and annual operational demands of particular energy systems during their lifetime in building. The application of energy systems based on thermal solar systems reduces energy consumption and operating costs of building for support heating and domestic hot water as well as savings of non-renewable fossil fuels. Correctly designed solar energy system depends on many characteristics, i. e. appropriate solar collector area and tank volume, collector tilt and orientation as well as quality of used components. The evaluation of thermal solar system components by calculation software shows how can be the original thermal solar system improved by means of performance. The system performance can be improved of more than 31 % than in given system by changing four thermal solar system parameters such as heat loss coefficient and aperture area of used solar collector, storage tank volume and its height and diameter ratio.

scholarly journals The Challenge of Climate Change—Complete Energy Systems Transformation: No Nuclear, No Net Zero

Nuclear Law ◽  
2022 ◽  
pp. 85-140
Author(s):  
Timothy Stone
Keyword(s):  
National Policy ◽  
Energy Systems ◽  
Energy System ◽  
Primary Energy ◽  
Low Carbon ◽  
Policy Makers ◽  
Call To Action ◽  
Net Zero ◽  
Primary Energy Supply ◽  
Systems Transformation

AbstractTo achieve Net Zero, natural gas, gasoline, diesel, and fuel oils must be replaced with another source. However, most of the current low-carbon energy sources will also need to be replaced as almost none have more than about 25 years remaining of useful life. The pace and scale of the needed change is unprecedented: almost the whole of the world’s primary energy supply must be replaced. The (re)development of the entire energy system is inherently a sovereign risk and it can only be governments who set national energy policy. There is no doubt that markets will continue to play a part in future energy systems, but at the top level, the pace and scale of change to achieve Net Zero is simply far too fast for markets to adapt properly. This chapter is a call to action to the national policy makers and presents this challenge as an opportunity for creating higher-quality jobs and potentially highly attractive and long-dated investment options. The chapter also outlines some risks, including political indecisiveness and policy volatility as potential impediments to making the most of this opportunity and achieving the Net Zero.

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