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Number of results: 9
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Abstract

The paper presents results of a parametric analysis of a hightemperature nuclear-reactor cogeneration system. The aim was to investigate the power efficiency of the system generating heat for a high-temperature technological process and electricity in a Brayton cycle and additionally in organic Rankine cycles using R236ea and R1234ze as working fluids. The results of the analyses indicate that it is possible to combine a 100 MW high-temperature gas-cooled nuclear reactor with a technological process with the demand for heat ranging from 5 to 25 MW, where the required temperature of the process heat carrier is at the level of 650°C. Calculations were performed for various pressures of R236ea at the turbine inlet. The cogeneration system maximum power efficiency in the analysed cases ranges from ~35.5% to ~45.7% and the maximum share of the organic Rankine cycle systems in electric power totals from ~26.9% to ~30.8%. If such a system is used to produce electricity instead of conventional plants, carbon dioxide emissions can be reduced by about 216.03–147.42 kt/year depending on the demand for process heat, including the reduction achieved in the organic Rankine cycle systems by about 58.01–45.39 kt/year (in Poland).
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Authors and Affiliations

Julian Jędrzejewski
1
Małgorzata Hanuszkiewicz-Drapała
2

  1. Antea Polska S.A., Duleby 5, 40-833 Katowice, Poland
  2. Silesian University of Technology, Faculty of Energy and Environmental Engineering, Konarskiego 18, 44-100 Gliwice, Poland
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Abstract

Carbon taxing is an efficient instrument that is implemented by several countries to reduce CO2 emissions. Taxed products and services that result in emitting CO2 in their processes will be replaced by more sustainable alternatives. Carbon taxing is associated with concerns about high energy prices that can negatively affect households and businesses. Egypt, one of the low middle-income developing countries, depends on fossil fuels to supply more than 93% of its total energy supply. In this paper, an analysis is carried out to assess the effects of a suggested carbon tax on the major carbon emitting sectors; power generation, transport and industry. The results show that the power generation sector can absorb and benefit from a suggested tax at a rate of USD 5 per ton of emitted CO2. The transport sector, which relies heavily on subsidized liquid fuels, needs an urgent reform program to remove these subsidies, which costs the country about 10 billion USD annually, and after that, the carbon tax can be introduced. The industry sector may be affected negatively by the suggested tax, due to competitiveness with non-taxed imported products. On the other hand, this tax can help this sector to be prepared to compete when exporting its products to foreign markets that apply carbon taxes. In conclusion, developing countries like Egypt need a well-planned carbon tax program that can make revenues, remove subsidies, and prepare local industries for fair competitiveness in the global market.
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Authors and Affiliations

Tarek Ibrahim El-Shennawy
1
ORCID: ORCID
Lamiaa Abdallah
2

  1. Alexandria National Refining and Petrochemicals Co. (ANRPC), Egypt
  2. Alexandria Higher Institute of Engineering and Technology (AIET), Egypt
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Abstract

The paper presents the impact of the reformed EU ETS (Emission Trading Scheme – ETS in

the European Union) on the currently operating market for trading in CO2 emission allowances.

The new Directive introduced a number of changes aimed at tightening the climate policy, which

the Polish energy sector based mainly on hard coal may mean an increase in the costs of electricity

production, and thus an increase in the cost of the entire economy.

The main goal of the changes is to achieve one of the objectives the European Union has set for itself,

i.e. the reduction of CO2 emissions by 40% until the year 2030. These assumptions are the result of

joint arrangements of the EU countries under the Paris Agreement on climate change adopted in 2015.

The Directive introduces a new market stability reserve mechanism (MSR) which, according to its

assumptions, is designed to ensure a demand and supply balance of the ETS. Bearing the balance in

mind, it means the reduction of excess allowances, which, although their number is decreasing, it is

decreasing to slowly according to EU legislators, still oscillating around 2 billion EUA.

The paper also draws attention to the rigorous assumptions adopted in the new Directive, aimed at

increasing the price of CO2, that is the costs in electricity production. Due to manually-controlled

prices, are we doomed to high CO2 prices and therefore the prices of electricity? What are its estimated

maximum levels? Will the new assumptions encourage the Member States to switch to lowcarbon

technologies? Can they weaken the economies of countries that are currently based mainly

on coal energy sources, and strengthen countries where green energy is developed?

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Authors and Affiliations

Katarzyna Piwowarczyk-Ściebura
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Abstract

Electric vehicles are predicted to blossom in Egypt in future years as an emerging technology in both the transportation and power sectors, contributing significantly to the decrease of fossil-fuel usage and CO2 emissions. As a result, to mitigate overloads of the vehicle energy demand on the nation’s electric grid, a solar PV system can be used to provide the electricity needs of an EV charging station. This objective of this paper is to present the design, simulation and economic analysis of a grid-connected solar-power system for an electric-charging station at a workplace in 6th October city, Egypt using PVSOL simulation tool to supply energy to the charging station and office-building appliances. The ideal orientation of the PV panels for maximum energy was determined using data from the photovoltaic geographical information system and predicted load- -profile patterns. The amount of electricity generated the efficiency of the PV power system, financial analysis in terms of investment costs and the return on assets, and the ability to reduce CO2 emissions are all estimated in this study. This system also evaluates annual energy predictions and is used for electric-vehicle charging, grid feeding, and appliance consumption. Due to the relatively high solar insolation in Egypt; PV production energy was 10,463 kWh per year and the annual yield is 1,786.69 kWh/kWp. Of the power from PV generation, 66% is utilized for charging the electric vehicle and 34% for electrical appliances. After applying the financial analysis for 20 years; the electricity production cost is 0.0032 $/kWh and the payback period for this proposed system is about five years. The annual energy costs after the installation of PV systems proposed system created a financial saving of 21%. The performance ratio of this system inverter is 84% and the monthly average of the electric vehicle SOC over a year doesn’t decrease out of 27% plus 5 tons of CO2 emissions per year were avoided. This research can be used as a recommendation for stakeholders who want to use this energy source for vehicle charging.

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Authors and Affiliations

Marwa M. Ibrahim
1
ORCID: ORCID

  1. Mechanical Engineering Department, National Research Centre (NRC), Dokki, Cairo, Egypt
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Abstract

A domestic hot water (DHW) system has been modernized in a multi-family house, located in the southeastern part of Poland, inhabited by 105 people. The existing heating system (2 gas boilers) was extended by a solar system consisting of 32 evacuated tube collectors with a heat pipe (the absorber area: 38.72 m2). On the basis of the system performance data, the ecological effect of the modernization, expressed in avoided CO2 emission, was estimated. The use of the solar thermal system allows CO2 emissions to be reduced up to 4.4 Mg annually. When analyzing the environmental effects of the application of the solar system, the production cycle of the most material-consuming components, namely: DHW storage tank and solar collectors, was taken into account. To further reduce CO2 emission, a photovoltaic installation (PV), supplying electric power to the pump-control system of the solar thermal system has been proposed. In the Matlab computing environment, based on the solar installation measurement data and the data of the total radiation intensity measurement, the area of photovoltaic panels and battery capacity has been optimized. It has been shown that the photovoltaic panel of approx. 1.8 m2 and 12 V battery capacity of approx. 21 Ah gives the greatest ecological effects in the form of the lowest CO2 emission. If a photovoltaic system was added it could reduce emissions by up to an additional 160 kg per year. The above calculations take also emissions resulting from the production of PV panels and batteries into account.

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Authors and Affiliations

Piotr Olczak
ORCID: ORCID
Małgorzata Olek
Dominik Kryzia
ORCID: ORCID
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Abstract

Power generation units, suitable for individual users and small scale applications, are mainly based on spark ignition engines. In recently performed research, reductions of emissions coming from such units, especially considering carbon dioxide emissions, are deemed as the issue of particular importance. One of solutions, postponed to reduce impact of spark ignition engine-based units on the natural environment, is transition from fossil fuels into renewable gaseous fuels, as products of organic digestion. Nonetheless, development of new solutions is required to prevent further carbon dioxide emissions. The paper presents a novel dual approach developed to reduce carbon dioxide emissions from stationary power units, basing on spark ignition engine. The discussed approach includes both reduction in carbon content in the fuel, which is realized by its enrichment with hydrogen produced using the solar energy-supported electrolysis process, as well as application of post-combustion carbon dioxide separation. Results of the performed analysis suggest profitability of transition from fossil into the hydrogen-enriched fuel mixture, with significant rise in operational parameters of the system following increase in the hydrogen content. Nevertheless, utilization of the carbon dioxide separation leads to vital soar in internal energy demand, causing vital loss in operational and economical parameters of the analyzed system.
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Authors and Affiliations

Katarzyna Janusz-Szymańska
1
Krzysztof Grzywnowicz
1
Grzegorz Wiciak
1
Leszek Remiorz
1

  1. Silesian University of Technology, Faculty of Energy and Environmental Engineering, Akademicka 2A, 44-100 Gliwice, Poland
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Abstract

An analysis of the methods used in Bulgaria for estimating CO2, SO2 and dust emissions has been conducted. The first methodology, which is officially used by all energy auditors at the Agency for Sustainable Energy Development targets the energy efficiency of combustion devices installed mainly at industrial enterprises. The second methodology, used by the Ministry of Environment and Water, is more comprehensive and can be applied to thermal power plants, small combustion plants as well as industrial systems. In recent years, many projects related to energy efficiency and renewable energy projects, including hydrogen technologies, which require an assessment of reduced greenhouse gas emissions, have been implemented as a priority. The use of reliable and accurate methods is essential in the assessment of greenhouse emissions. A novel methodology, based on stoichiometric equations of the combustion process for solid, liquid and gaseous fuels has been proposed and comprised. This novel methodology is characterized by higher precision compared to the methods currently in place and this is achieved through calculating emissions from the combustion of energy fuels accounting for the full elemental composition of the fuel and its heating value, whereas the current commonly applied methods use only the fuel type and the carbon content. A further benefit of the proposed methodology is the ability to estimate emissions of fuels for which there is no alternative method for calculating CO2, SO2 and dust. Results of emission calculations according to the analysed methods are presented. Finally, a comparative analysis between the presented methodologies including an assessment of their accuracy and universal applicability has been made.
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Authors and Affiliations

Iliya Krastev Iliev
1
Hristo Ivanov Beloev
1
Diana Ivanova Ilieva
2
Janusz Badur
3

  1. University of Ruse, Heat, Hydraulics and Environmental Engineering, Studentska 8, 7017 Ruse, Bulgaria
  2. University of Telecommunications and Post, Akad. Stefan Mladenov 1, 1700 Sofia, Bulgaria
  3. Energy Conversion Department, Institute of Fluid Flow Machinery, Polish Academy of Sciences, Fiszera 14, 80-251 Gdansk, Poland
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Abstract

The paper presents the results of energy and environmental evaluation of geothermal CHP plant. The variant of CHP plant based on Organic Rankine Cycle (ORC) has been taken into consideration as the most favorable for the geothermal conditions prevailing in Poland. The existing geothermal well located in the city of Konin in Greater Poland (Wielkopolska) voivodship has been chosen as the case study. The conceptual design of CHP plant has been proposed and evaluated from energy and environmental point of view. The non-renewable primary energy consumption has been chosen as energy performance criterion. In the case of environmental performance carbon dioxide emission has been taken as evaluation criterion. The analysis has been performed for different operating conditions and three working fluids. The best energy performance can be spotted for working fluid R123, for which the reduction varies between 15200 and 11900 MWh/a. The working fluid R134a has a worse energy performance, which allows for the reduction of fossil fuels energy consumption in the range of 15000 and 11700 MWh/a. The total reduction of CO2 emission is the highest for working fluid R123: 5300 to 4150 MgCO2/a, the medium one for working fluid R134a: 5200 to 4100 MgCO2/a and the lowest for working fluid R227: 5000 to 4050 MgCO2/a. It has been shown that the construction of geothermal CHP plants based on Organic Rankine Cycle can be reasonable solution in Polish conditions. It is important concerning the need of reduction of fossil fuels primary energy consumption and carbon dioxide emission.
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Authors and Affiliations

Tomasz Maciej Mróz
1
ORCID: ORCID
Weronika Grabowska
1

  1. Poznań University of Technology, Poland
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Abstract

This study offers an overview of how changing habits in consuming a cup of tea can contribute to make better environment. As the initial existing scenario, survey for picturing Indonesian consumers in preparing their cup of tea from dried leaves was conducted to urban and suburban citizens. According to the survey, both respondent groups were using LPG as the first choice in boiling water for preparing tea, followed by using an electric dispenser as the second choice. This habit causes CO2 emission from processing a cup of tea by Indonesian consumer was 24 g CO2-eq per cup of tea, excluding the tea organic waste. The portion of CO2 emission from boiling water in tea preparation was 41.93% of whole CO2 emission from plantation to served cup. The emission can be significantly reduced by converting dried tea (initial scenario) into the ready-to-drink product, in the form of powdered tea (second scenario) and boxed tea (third scenario). This study simulated an integrated system of tea product manufacturing system with biogas utilization produced from tea organic waste. Simulation conducted based on daily manufacturing process at the Gamboeng green tea factory. Additional required energies were simulated from the wood pellet, which is the best practice in the Gamboeng Tea factory. By shifting tea consuming habit from dried tea to powdered tea and/or boxed tea, the emission from a cup of tea can be reduced, with range of reduction varied from 8.87 g to 22.13 g CO2-eq per cup of tea. If the Gamboeng green tea daily production capacity of the factory is fully converted into powdered tea, the potency of CO2 emission reduction reaches 26.92 metric ton CO2. However, the factory should pay attention to providing the water for the manufacturing process. The required water was 45.23 m3 of drinking water if all dried tea converted to powdered tea. Moreover, 11.53 m3 of water is required as irrigation for the biogas process in converting all tea organic waste into biogas.
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Authors and Affiliations

Teuku Beuna Bardant
1
Arief Ameir Rahman Setiawan
2 5
Muthia Syafika Haq
3
Hafiizh Prasetia
5
Adhi Irianto Mastur
3
Sugeng Harianto
3
Agusta Samodra Putra
4 5
Anny Sulaswatty
1
Edi Iswanto Wiloso
5
Ryozo Noguchi
4

  1. Research Center for Chemistry, Indonesian Institute of Sciences (LIPI),Kawasan Puspiptek, Serpong, Tangerang Selatan, Indonesia
  2. Graduate School of Sciences and Engineering, University of Tsukuba, Tsukuba, Japan
  3. Research Institute for Tea and Cinchona, Mekarsari, Gambung, Bandung, Indonesia
  4. Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
  5. Research Center for Policy and Management of Science, Technology and Innovation,Indonesian Institute of Sciences (LIPI), Jl. Gatot Subroto 10, Jakarta Selatan, Indonesia

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