scholarly journals The impact of single engine taxiing on aircraft fuel consumption and pollutant emissions

2018 ◽  
Vol 122 (1258) ◽  
pp. 1967-1984 ◽  
Author(s):  
M. E. J. Stettler ◽  
G. S. Koudis ◽  
S. J. Hu ◽  
A. Majumdar ◽  
W. Y. Ochieng
Keyword(s):  
Fuel Consumption ◽  
Pollutant Emissions ◽  
Future Research ◽  
Reduce Fuel Consumption ◽  
Flight Data ◽  
Set Operations ◽  
Aircraft Fuel ◽  
Fuel Consumption And Emissions ◽  
The Impact

ABSTRACTOptimisation of aircraft ground operations to reduce airport emissions can reduce resultant local air quality impacts. Single engine taxiing (SET), where only half of the installed number of engines are used for the majority of the taxi duration, offers the opportunity to reduce fuel consumption, and emissions of NOX, CO and HC. Using 3510 flight data records, this paper develops a model for SET operations and presents a case study of London Heathrow, where we show that SET is regularly implemented during taxi-in. The model predicts fuel consumption and pollutant emissions with greater accuracy than previous studies that used simplistic assumptions. Without SET during taxi-in, fuel consumption and pollutant emissions would increase by up to 50%. Reducing the time before SET is initiated to the 25th percentile of recorded values would reduce fuel consumption and pollutant emissions by 7–14%, respectively, relative to current operations. Future research should investigate the practicalities of reducing the time before SET initialisation so that additional benefits of reduced fuel loadings, which would decrease fuel consumption across the whole flight, can be achieved.

Determination of fuel consumption and pollutant emissions with the real-time engine running data of aircrafts in the taxi-out period

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Mehmet Kadri Akyüz
Keyword(s):  
Real Time ◽  
Fuel Consumption ◽  
Aircraft Engine ◽  
Pollutant Emissions ◽  
Civil Aviation ◽  
Exhaust Emission ◽  
Content Type ◽  
Flight Data ◽  
Total Fuel Consumption ◽  
Fuel Consumption And Emissions

Purpose The purpose of this paper is to calculate the fuel consumption and emissions of carbon monoxide (CO), nitrogen oxide (NOx) and hydrocarbons (HC) in the taxi-out period of aircraft at the International Diyarbakir Airport in 2018 and 2019. Design/methodology/approach Calculations were performed by determining the engine operating times in the taxi-out period with the flight data obtained from the airport authority. In the analyses, aircraft series and aircraft engine types were determined, and the Engine Exhaust Emission Databank of the International Civil Aviation Authority (ICAO) were used for the calculation. Findings Total fuel consumption in the taxi-out period in 2018 and 2019 was calculated as 525.64 and 463.69 tons, respectively. In 2018, HC, CO and NOx emissions caused by fuel consumption were found to be 1,109, 10,668 and 2,339 kg, respectively. In 2019, the total HC, CO and NOx emissions released to the atmosphere during the taxi-out phase are 966, 9,391 and 2,126 kg, respectively. B737 Series aircraft have the largest share in total fuel consumption and pollutant emissions. Practical implications This study explains the importance of determining fuel consumption and pollutant emissions by considering engine operating times in the taxi-out period. The study provides aviation authorities with scientific methods to follow in calculating fuel consumption and emissions from aircraft operations. Originality/value The originality of this study is the calculation of fuel consumption and pollutant emissions by determining real-time engine running times in the taxi-out period. In addition, calculations were made with real engine operating times determined in the taxi-out period using real flight data.

Post-occupancy evaluation of outdoor spaces on the campus of the Federal University of Juiz de Fora, Brazil

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ana Clara Carvalho Tourinho ◽  
Sabrina Andrade Barbosa ◽  
Özgür Göçer ◽  
Klaus Chaves Alberto
Keyword(s):  
Critical Role ◽  
Future Research ◽  
Content Type ◽  
University Campuses ◽  
Post Occupancy Evaluation ◽  
Outdoor Spaces ◽  
The University ◽  
The Impact ◽  
Practical Implications

PurposeUsing the campus of a Brazilian university as case study, this research aims to identify which aspects of the outdoor spaces are the most significant in attracting people.Design/methodology/approachThis research relies on the application of different post-occupancy evaluation (POE) methods, including user tracking, behavioural mapping and questionnaires, on one plateau of the campus.FindingsThree group of aspects (socialization, proximity and infrastructure) were identified as key elements in explaining the impact of the campus physical characteristics on users’ behaviour. The results indicate that having characteristics of at least one group of aspects in those spaces can guarantee their vitality and, if there is presence of attributes of more than one group, liveliness can be increased.Research limitations/implicationsFurther studies should be conducted on an entire campus to identify other spatial elements in the three groups.Practical implicationsThis research contributes to the planning of future campuses and to solutions to the existed ones, indicating the most relevant spatial characteristics to be considered. Additionally, the combination of different methods may be useful to future research.Originality/valueMost of the investigations on the university campuses focus on the buildings, and little research has investigated the outdoor spaces, although they play a critical role in learning and academic life, where people establish social, cultural and personal relationships. In addition, studies using several POE allowed a consistent and complete diagnostic about the aspects of the campus, giving recommendations for future projects.

Numerical and Experimental Study on the Impact of Mild Cold EGR on Exhaust Emissions in a Biodiesel Fueled Diesel Engine

2021 ◽  
Author(s):  
Alex Oliveira ◽  
Junfeng Yang ◽  
Jose Sodre
Keyword(s):  
Diesel Engine ◽  
Fuel Consumption ◽  
Exhaust Emissions ◽  
Pollutant Emissions ◽  
Cylinder Pressure ◽  
Nox Formation ◽  
Ratio Distribution ◽  
Engine Model ◽  
Gas Recirculation ◽  
The Impact

Abstract This work evaluated the effect of cooled exhaust gas recirculation (EGR) on fuel consumption and pollutant emissions from a diesel engine fueled with B8 (a blend of biodiesel and Diesel 8:92%% by volume), experimentally and numerically. Experiments were carried out on a Diesel power generator with varying loads from 5 kW to 35 kW and 10% of cold EGR ratio. Exhaust emissions (e.g. THC, NOX, CO etc.) were measured and evaluated. The results showed mild EGR and low biodiesel content have minor impact of engine specific fuel consumption, fuel conversion efficiency and in-cylinder pressure. Meanwhile, the combination of EGR and biodiesel reduced THC and NOX up to 52% and 59%, which shows promising effect on overcoming the PM-NOX trade-off from diesel engine. A 3D CFD engine model incorporated with detailed biodiesel combustion kinetics and NOx formation kinetics was validated against measured in-cylinder pressure, temperature and engine-out NO emission from diesel engine. This valid model was then employed to investigate the in-cylinder temperature and equivalence ratio distribution that predominate NOx formation. The results showed that the reduction of NOx emission by EGR and biodiesel is obtained by a little reduction of the local in-cylinder temperature and, mainly, by creating comparatively rich combusting mixture.

scholarly journals The importance of eco-driving training for drivers in transport companies – A case study

2021 ◽  
Vol 67 (1) ◽  
pp. 47-51
Author(s):  
Tatjana Savković ◽  
Pavle Gladović ◽  
Milica Miličić ◽  
Pavle Pitka ◽  
Dejan Koleška
Keyword(s):  
Fuel Consumption ◽  
Management System ◽  
Driving Behavior ◽  
Truck Drivers ◽  
Training Period ◽  
Fleet Management ◽  
Short Term ◽  
The Impact

The paper evaluates the impact of eco-driving programs on driving behavior. The study involved 4 professional truck drivers, which examined two operational driving prameters: fuel consumption and idling. Driving behavior was analyzed through three periods: pre-training period (P1), training period (P2), first month after training (P3) and second month after training (P4). Data were collected using Scania Fleet Management System. The results show that there was an improvement in the observed parameters in short-term. Namely, a decrease in fuel consumption and idling was achieved, in the periods P2, P3 and P4 in relation to the period P1. Due to the realized reductions of the observed parameters, costs in transport companies can be significantly reduced annually.

scholarly journals Enhancing Students’ Understanding and Revision of Narrative Writing through Self-Assessment and Dialogue: A Qualitative Multi-Case Study

2015 ◽  
Author(s):  
Stephanie Baxa
Keyword(s):  
Self Efficacy ◽  
Fifth Grade ◽  
Future Research ◽  
Writing Conferences ◽  
Teacher Language ◽  
Self Assessment ◽  
Self Assessments ◽  
Teacher Assessments ◽  
The Impact

With students losing hope when faced with challenges in the classroom, daily student-involved formative assessment that contributes to a growth mindset is essential. Through self-assessment and dialogue, students can generate feedback used for improvement of their writing, and teachers can give feedback that fosters self-efficacy. The purpose of this qualitative multi-case study was to explore the growth of fifth-grade writers as they participated in self-assessment, writing conferences with their teacher, and story revision. Research questions focused on students’ ability to explain learning targets and strengths and weaknesses of their writing and their ability to revise their writing. The participants, two male and one female, were randomly chosen from the teacher/researcher’s fifth-grade classroom in a large public school in the Midwest. Data sources included audio-recorded interviews and writing conferences, student-written work and self-assessments, and teacher assessments and notes. Self-assessment and dialogue with the teacher served as tools for providing feedback to the student and the teacher. Throughout implementation of the instructional strategies, students were able to talk about the learning targets and the strengths and weaknesses of their writing and were motivated and able to revise their writing. Limitations of the study included the length of the study and diversity of participants. Suggestions for future research included exploring ways to elicit more student feedback and the impact of teacher language during writing conferences on the self-efficacy of students.

scholarly journals TAX RESEARCH Financial Accounting versus Tax Accounting - Tax Rules’ Impact on Investment Decisions

2016 ◽  
Vol 4 (1) ◽  
pp. 9
Author(s):  
Dr.Sc. Skender Ahmeti ◽  
Dr.Sc. Muhamet Aliu ◽  
MSc. Alban Elshani ◽  
Yllka Ahmeti
Keyword(s):  
Investment Decisions ◽  
Financial Statements ◽  
Financial Accounting ◽  
Future Research ◽  
International Accounting Standards ◽  
Corporation Tax ◽  
Tax Research ◽  
The Impact

This paper provides guidance for all those interested in research related to tax. In the study are included three main areas dealing with taxes and about taxes: (1) the role of information in corporation tax expenditures under the rules and laws of the country against financial statements according to international accounting standards, (2) case study PTK; how much effective tax and tax on extra profit has it paid (3) the impact of tax rules on investment decisions - the reasons and profits of the company and the host country. We will try to summarize here the three areas of study and come to some conclusions on how to deal with fiscal policy in Kosovo. In addition, we will offer our opinion on some interesting and important questions for future research.

scholarly journals Environmental Strategies for Selecting Eco-Routing in a Small City

Atmosphere ◽  
2019 ◽  
Vol 10 (8) ◽  
pp. 448 ◽  
Author(s):  
Juan Francisco Coloma ◽  
Marta García ◽  
Yang Wang ◽  
Andrés Monzón
Keyword(s):  
Fuel Consumption ◽  
Real Life ◽  
Weather Conditions ◽  
Pollutant Emissions ◽  
Small City ◽  
Pollution Levels ◽  
Balanced Distribution ◽  
Reduce Emissions ◽  
Fuel Consumption And Emissions ◽  
The City

This research aims to find the most ecological itineraries for urban mobility in a small city (eco-routes), where distances are rather short, but car dependence is really high. A real life citywide survey was carried out in the city of Caceres (Spain) with almost 100,000 inhabitants. Research was done on alternating routes, traffic, times of day, and weather conditions. The output of the study was to assess fuel consumption, CO2, and regulated pollutant emissions for different type of vehicles, routes, and drivers. The results show that in the case studied, urban roads had fewer emissions (CO2 and pollutants) but there was an increase in the population affected by pollutants. On the contrary, bypasses reduced travel time and congestion but increased fuel consumption and emissions. Traffic conditions had a greater influence on fuel consumption in petrol vehicles than diesel ones. Therefore, there must be a balanced distribution of traffic in order to minimize congestion, and at the same time to reduce emissions and the number of people affected by harmful pollution levels. There should be a combination of regulatory measures in traffic policies in order to achieve that balance by controlling access to city centres, limiting parking spaces, pedestrianization, and lowering traffic speeds in sensitive areas.

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