Economic and environmental viability assessment of NASA’s turboelectric distribution propulsion
TL;DR: In this paper, a case study of the National Aeronautics and Space Administration's (NASA) proposal for a turboelectric-distributed propulsion aircraft, N3-X, using technical aspects and real data integration is presented.
About: This article is published in Energy Reports.The article was published on 2020-11-01 and is currently open access. It has received 6 citations till now.
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TL;DR: The findings of this review indicate the knowledge gaps in the field of numerical modelling for NASA’s TeDP and its capability to increase the efficiency by up to 24% with a 50% reduction in emissions relative to those of conventional gas turbines.
12 citations
TL;DR: Waste heat recovery (WHR) using conventional technologies can provide appreciable amounts of useful energy from waste heat (WH) sources, thus reducing the overall energy consumption of systems for economic purposes, as well as ameliorating the impact of fossil fuel-based CO2 emissions on the environment as mentioned in this paper .
5 citations
TL;DR: In this paper , the authors provided an economic analysis of a novel liquified hydrogen (LH2) tanker fuelled by hydrogen with a total capacity of ∼280,000 m3.
4 citations
TL;DR: In this paper , a study is conducted to find appropriate advanced combined gas and steam turbine cycles for marine propulsion systems in a large container ship with respect to the evolving maritime environmental regulations.
Abstract: Restrictions on emissions are being imposed by regional and international shipping organisations, which raise the question of which marine fuel and technology can most effectively replace heavy fuel oil and diesel engines. The aim of this study is to find appropriate advanced combined gas and steam turbine cycles for marine propulsion systems in a large container ship with respect to the evolving maritime environmental regulations. The selection criteria are the thermodynamic performance, emissions, size, and weight of advanced combined gas and steam turbine cycles in a large container ship. Two baselines are used: a diesel engine using marine diesel oil and a combined gas and steam turbine system using liquefied natural gas and marine diesel oil. Then, liquefied natural gas cycles are examined based on fuel replacement and enhanced to assess the benefits of liquefied natural gas over marine diesel oil. The results show that the enhanced liquefied natural gas combined gas and steam turbine cycles are the most efficient, at up to 1.6% higher than the other cycles. Regarding the size and weight, the combined gas and steam turbine propulsion system is approximately 24.7% lighter than the original diesel engine propulsion system.
2 citations
TL;DR: This study is the first to identify the key PIs of TeDP and to include a techno-economic environmental risk analysis (TERA) based on the identified key Pis, which could guide developers and researchers towards potential focus areas to realise the adoption of Te DP.
Abstract: PurposeRecent advancements in electrified transportation have been necessitated by the need to reduce environmentally harmful emissions. Accordingly, several aviation organisations and governments have introduced stringent emission reduction targets for 2050. One of the most promising technologies proposed for achieving these targets is turboelectric distributed propulsion (TeDP). The objective of this study was to explore and identify key indicators for enhancing the applicability of TeDP in air transportation.Design/methodology/approachAn enhancement valuation method was proposed to overcome the challenges associated with TeDP in terms of technological, economic and environmental impacts. The result indicators (RIs) were determined; the associated performance indicators (PIs) were analysed and the key RIs and PIs for TeDP were identified. Quantitative measurements were acquired from a simulated TeDP case study model to estimate the established key PIs.FindingsIt was determined that real-world TeDP efficiency could be enhanced by up to 8% by optimising the identified key PIs.Originality/valueThis study is the first to identify the key PIs of TeDP and to include a techno-economic environmental risk analysis (TERA) based on the identified key PIs. The findings could guide developers and researchers towards potential focus areas to realise the adoption of TeDP.
2 citations
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TL;DR: In this article, the authors define corporate social performance (CSP) and reformulate the CSP model to build a coherent, integrative framework for business and society research, where principles of social responsibility are framed at the institutional, organizational, and individual levels; processes of social responsiveness are shown to be environmental assessment, stakeholder management, and issues management; and outcomes of CSP are posed as social impacts, programs, and policies.
Abstract: This article defines corporate social performance (CSP) and reformulates the CSP model to build a coherent, integrative framework for business and society research. Principles of social responsibility are framed at the institutional, organizational, and individual levels; processes of social responsiveness are shown to be environmental assessment, stakeholder management, and issues management; and outcomes of CSP are posed as social impacts, programs, and policies. Rethinking CSP in this manner points to vital research questions that have not yet been addressed.
4,690 citations
TL;DR: This paper extended earlier research concerning the relationship between corporate social performance and corporate financial performance, with particular emphasis on methodological inconsistencie... and showed that methodological inconsistency is a major obstacle in the analysis.
Abstract: This article extends earlier research concerning the relationship between corporate social performance and corporate financial performance, with particular emphasis on methodological inconsistencie...
1,929 citations
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TL;DR: In this article, the authors extend earlier research concerning the relationship between corporate social performance and corporate financial performance, with particular emphasis on methodological inconsistencies, and they use the five most commonly applied accounting measures in the Corporate Social Performance and Corporate financial performance (CSP/CFP) to assess corporate financial performances.
Abstract: This article extend earlier research concerning the relationship between corporate social performance and corporate financial performance, with particular emphasis on methodological inconsistencies. Research in this area is extended in three critical areas. First, it focuses on a particular industry, the chemical industry. Second, it use multiple sources of data -- two that are perceptually based (KLD Index and Fortune reputation survey), and two that are performance based (TRI database and corporate philanthropy) in order to triangulate toward assessing corporate social performance. Third, it use the five most commonly applied accounting measures in the corporate social performance and corporate financial performance (CSP/CFP) to assess corporate financial performance. The results indicate that the a priori use of measures may actually predetermine the CSP/CFP relationship outcome. Surprisingly, Fortune and KLD Indices very closely track one another, whereas TRI and corporate philanthropy differentiate between high and low social performers and do not correlate to the firm's financial performance.
1,868 citations
TL;DR: In this paper, the authors trace the evolution of the corporate social performance model by focusing on three challenges to the concept of corporate social responsibility: economic responsibility, public responsibility, and social responsiveness.
Abstract: This paper traces the evolution of the corporate social performance model by focusing on three challenges to the concept of corporate social responsibility: economic responsibility, public responsibility, and social responsiveness, it also examines social issues management as a dimension of corporate social performance. It concludes that the corporate social performance model is valuable for business and society study and that it provides the beginnings of a paradigm for the field.
1,808 citations
TL;DR: In this paper, the authors investigate why the discounted cash flow model and residual income model frequently give different value estimates and identify three common errors in the implementation of the models and show that these errors affect the models in different ways, creating differences in the value estimates that each produces.
Abstract: In this paper we investigate why the discounted cash flow model and residual income model frequently give different value estimates. We identify three common errors in the implementation of the models and show that these errors affect the models in different ways, creating differences in the value estimates that each produces. Our estimates of the size and direction of these errors roughly reconciles the observed differences in value estimates from papers attempting to "horse-race" the models. We also argue that any such contest is ill-conceived; given the same set of forecasted financial statements all models derived from the basic dividend-discounting assumption should yield the same value estimate. We discuss why claims of the residual income model's superiority over the discounted cash flow model, both on empirical and theoretical grounds, are misstated.
235 citations